From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!eesn13.ews.uiuc.edu!grasso Newsgroups: uiuc.class.ece359 From: Daniel M Grasso Subject: book found Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 8 Date: Sun, 8 Oct 2000 14:36:42 -0500 NNTP-Posting-Host: 130.126.161.197 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 971033755 130.126.161.197 (Sun, 08 Oct 2000 14:35:55 CDT) NNTP-Posting-Date: Sun, 08 Oct 2000 14:35:55 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:30 Hello all, I found a copy of "Communication Systems" by Haykin in Everitt on Friday. If anyone has lost this book, please contact me by email. -dan From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!ux11.cso.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: vikas kawadia X-Sender: kawadia@ux11.cso.uiuc.edu Reply-To: kawadia@uiuc.edu Subject: Corrections and clarifications Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 16 Date: Tue, 24 Oct 2000 03:56:57 -0500 NNTP-Posting-Host: 128.174.5.105 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 972377767 128.174.5.105 (Tue, 24 Oct 2000 03:56:07 CDT) NNTP-Posting-Date: Tue, 24 Oct 2000 03:56:07 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:34 Hi all, Here are a few corrections in the previous homeworks and a clarification for the next one. 1. HW#5, Q 5.3b) The correct answer is beta=5/4. The expression given in the soln is off by a factor of 2*pi. 2. HW #6, Q 6.3) P(error) should be 0.51 and not 0.66. The last entry was misread as 0.05 instead on 0.20 Clarification for HW#7, problems 7.5 and 7.6 The joint pdf is zero in all the regions where it is not specified. ..vikas From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Mark Brady" Newsgroups: uiuc.class.ece359 Subject: Def'ns for QAM Lines: 35 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Message-ID: <2mRx5.841$rr.17563@vixen.cso.uiuc.edu> Date: Tue, 19 Sep 2000 17:00:15 -0500 NNTP-Posting-Host: 130.126.218.13 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969400830 130.126.218.13 (Tue, 19 Sep 2000 17:00:30 CDT) NNTP-Posting-Date: Tue, 19 Sep 2000 17:00:30 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:15 A quick question: In lecuture, we said that the QAM encoding of g_i(t) and g_q(t) (in-phase and quadrature components, respectively) was given by g(t) = g_i(t)*cos(w_c*t) - g_q(t)*sin(w_c*t). I think that this is responsible for the nice property that CplxEnvelope( g(t) ) = g_i(t) + j*g_q(t) However, this does not look the same as presented in the Lathi (page 170), where he uses m1(t) defined to be "in-phase channel" e.g. g_i(t) m2(t) defined to be "quadrature channel" e.g. g_q(t) and then defines the QAM modulated signal g(t) to be: g(t) = m1(t)*cos(w_c*t) + m2(t)*sin(w_c*t) equivalently, g(t) = g_i(t)*cos(w_c*t) + g_q(t)*sin(w_c*t) Which leads to CplxEnvelope( g(t) ) = g_i(t) - j*g_q(t) Of course the definitions are somewhat arbitrary, but for purposes of this course, which ought we use? Thanks, Mark Brady From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Rob Wade" Newsgroups: uiuc.class.ece359 References: <2mRx5.841$rr.17563@vixen.cso.uiuc.edu> Subject: Re: Def'ns for QAM Lines: 43 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-Proxy-Client: rwwade@uiuc.edu from c797614-a.chmpgn1.il.home.com Message-ID: Date: Wed, 20 Sep 2000 01:13:09 -0500 NNTP-Posting-Host: 128.174.5.27 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969430353 128.174.5.27 (Wed, 20 Sep 2000 01:12:33 CDT) NNTP-Posting-Date: Wed, 20 Sep 2000 01:12:33 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:16 >From a previous class QAM= symbols/sec If it means the same thing here i hope this helps. -Rob Mark Brady wrote in message news:2mRx5.841$rr.17563@vixen.cso.uiuc.edu... > A quick question: > > In lecuture, we said that the QAM encoding of g_i(t) and g_q(t) (in-phase > and quadrature components, respectively) was given by > > g(t) = g_i(t)*cos(w_c*t) - g_q(t)*sin(w_c*t). > > I think that this is responsible for the nice property that > > CplxEnvelope( g(t) ) = g_i(t) + j*g_q(t) > > However, this does not look the same as presented in the Lathi (page 170), > where he uses > > m1(t) defined to be "in-phase channel" e.g. g_i(t) > m2(t) defined to be "quadrature channel" e.g. g_q(t) > > and then defines the QAM modulated signal g(t) to be: > > g(t) = m1(t)*cos(w_c*t) + m2(t)*sin(w_c*t) > equivalently, > g(t) = g_i(t)*cos(w_c*t) + g_q(t)*sin(w_c*t) > > Which leads to > > CplxEnvelope( g(t) ) = g_i(t) - j*g_q(t) > > Of course the definitions are somewhat arbitrary, but for purposes of this > course, which ought we use? > > Thanks, > Mark Brady > > > From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!staff2.cso.uiuc.edu!chadjic Newsgroups: uiuc.class.ece359 From: hadjicostis christoforos n X-Sender: chadjic@staff2.cso.uiuc.edu Subject: Re: Def'ns for QAM In-Reply-To: Message-ID: References: <2mRx5.841$rr.17563@vixen.cso.uiuc.edu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 70 Date: Wed, 20 Sep 2000 01:57:21 -0500 NNTP-Posting-Host: 128.174.5.53 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969432999 128.174.5.53 (Wed, 20 Sep 2000 01:56:39 CDT) NNTP-Posting-Date: Wed, 20 Sep 2000 01:56:39 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:18 Mark, I agree, there seems to be a discrepancy between the two definitions. The thing to remember though is that QAM is dealing with two DIFFERENT signals (m1(t) and m2(t)), whereas the expression for g(t) in terms of its in-phase and quadrature-phase components was DERIVED after defining the complex envelop and its real and imaginary parts (g_i(t) and g_q(t) respectively). So, the discrepancy (if any) is in the definition of g_q(t) as the quadrature component. I hope this helps. C. Hadjicostis. PS: I will talk about QAM on Thursday's lecture. On Wed, 20 Sep 2000, Rob Wade wrote: > From a previous class QAM= symbols/sec If it means the same thing here i > hope this helps. > -Rob > > Mark Brady wrote in message > news:2mRx5.841$rr.17563@vixen.cso.uiuc.edu... > > A quick question: > > > > In lecuture, we said that the QAM encoding of g_i(t) and g_q(t) (in-phase > > and quadrature components, respectively) was given by > > > > g(t) = g_i(t)*cos(w_c*t) - g_q(t)*sin(w_c*t). > > > > I think that this is responsible for the nice property that > > > > CplxEnvelope( g(t) ) = g_i(t) + j*g_q(t) > > > > However, this does not look the same as presented in the Lathi (page 170), > > where he uses > > > > m1(t) defined to be "in-phase channel" e.g. g_i(t) > > m2(t) defined to be "quadrature channel" e.g. g_q(t) > > > > and then defines the QAM modulated signal g(t) to be: > > > > g(t) = m1(t)*cos(w_c*t) + m2(t)*sin(w_c*t) > > equivalently, > > g(t) = g_i(t)*cos(w_c*t) + g_q(t)*sin(w_c*t) > > > > Which leads to > > > > CplxEnvelope( g(t) ) = g_i(t) - j*g_q(t) > > > > Of course the definitions are somewhat arbitrary, but for purposes of this > > course, which ought we use? > > > > Thanks, > > Mark Brady > > > > > > > > > > From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!ux8.cso.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: vikas kawadia X-Sender: kawadia@ux8.cso.uiuc.edu Reply-To: kawadia@uiuc.edu Subject: Exam 1, fall 99 Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 11 Date: Wed, 20 Sep 2000 03:10:09 -0500 NNTP-Posting-Host: 128.174.5.44 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969437364 128.174.5.44 (Wed, 20 Sep 2000 03:09:24 CDT) NNTP-Posting-Date: Wed, 20 Sep 2000 03:09:24 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:19 Hello all, Last year's Exam 1 has now been posted on the courses web page. There is an "Old_exams" button at the bottom of the webpage which can lead you to it. Or the complete address is : http://www.ece.uiuc.edu/ece359/old_exams/old_exams.html Enjoy.. ..vikas From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Rob Wade" Newsgroups: uiuc.class.ece359 Subject: Final Exam time and location Lines: 8 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-Proxy-Client: rwwade@uiuc.edu from c797614-a.chmpgn1.il.home.com Message-ID: <140Z5.8393$4h2.140951@vixen.cso.uiuc.edu> Date: Mon, 11 Dec 2000 02:17:17 -0600 NNTP-Posting-Host: 128.174.5.27 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 976522621 128.174.5.27 (Mon, 11 Dec 2000 02:17:01 CST) NNTP-Posting-Date: Mon, 11 Dec 2000 02:17:01 CST Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:48 I don't remeber any changes to what is on the information sheet or the web page but I must double check that it is on Tuesday the 12th at 1:30pm in 161 EL. Thanks From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!not-for-mail Message-ID: <39DE2F20.BF02F043@uiuc.edu> From: Peter J Wahle X-Mailer: Mozilla 4.61 [en] (X11; U; SunOS 5.7 sun4u) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: uiuc.class.ece382,uiuc.class.ece359,uiuc.class.ece350,uiuc.class.ece345,uiuc.class.ece344,uiuc.class.ece340,uiuc.class.ece325,uiuc.class.ece313,uiuc.class.ece312,uiuc.class.ece311 Subject: GRADER NEEDED Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 8 Date: Fri, 06 Oct 2000 14:59:28 -0500 NNTP-Posting-Host: 130.126.161.226 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 970862318 130.126.161.226 (Fri, 06 Oct 2000 14:58:38 CDT) NNTP-Posting-Date: Fri, 06 Oct 2000 14:58:38 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece382:77 uiuc.class.ece359:29 uiuc.class.ece350:34 uiuc.class.ece345:3 uiuc.class.ece344:39 uiuc.class.ece340:534 uiuc.class.ece325:500 uiuc.class.ece313:14 uiuc.class.ece312:991 uiuc.class.ece311:196 We are looking for a grader for ECE 338: Communications Networks for Computers If you have taken this course or a similar one, or otherwise know the material, and are looking to earn some extra cash--please email Prof. Wah ( mail:b-wah@uiuc.edu ). 10 hours per week. From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!mikepery From: mikepery@fscked.org (Mike Perry) Newsgroups: uiuc.class.ece359 Subject: Half Power? Message-Id: User-Agent: slrn/0.9.6.2 (Linux) Lines: 6 Date: Thu, 07 Sep 2000 03:53:29 GMT NNTP-Posting-Host: 128.174.252.72 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 968298809 128.174.252.72 (Wed, 06 Sep 2000 22:53:29 CDT) NNTP-Posting-Date: Wed, 06 Sep 2000 22:53:29 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:8 How do you calculate Half Power bandwith? Do you just take the fourier transform and solve for |F(w)| > 1/Sqrt[2]? -- Mike Perry http://so.fscked.org From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!staff1.cso.uiuc.edu!chadjic Newsgroups: uiuc.class.ece359 From: hadjicostis christoforos n X-Sender: chadjic@staff1.cso.uiuc.edu Subject: Re: Half Power? In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 21 Date: Thu, 7 Sep 2000 01:10:44 -0500 NNTP-Posting-Host: 128.174.5.59 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 968307029 128.174.5.59 (Thu, 07 Sep 2000 01:10:29 CDT) NNTP-Posting-Date: Thu, 07 Sep 2000 01:10:29 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:9 Hi Mike, "Half-power" and "3db bandwidth" are the same. You need to find w_c such that |f(w_c)| = 1/sqrt(2) |f(w_peak)| (where |f(w_peak)| is the maximum value of the amplitude of the Fourier transform. C. Hadjicostis On Thu, 7 Sep 2000, Mike Perry wrote: > How do you calculate Half Power bandwith? Do you just take the fourier > transform and solve for |F(w)| > 1/Sqrt[2]? > > -- > Mike Perry > http://so.fscked.org > > From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!eesn23.ews.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: Vikas Kawadia Subject: Hint : HW #2, Problem 2.4 b) Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 6 Date: Sun, 10 Sep 2000 18:11:08 -0500 NNTP-Posting-Host: 130.126.161.207 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 968627428 130.126.161.207 (Sun, 10 Sep 2000 18:10:28 CDT) NNTP-Posting-Date: Sun, 10 Sep 2000 18:10:28 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:10 If you cannot prove this result mathematically and rigorously, do not bother much. A graphical illustration with explnations will be good enough for this particular problem. ..vikas From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!ux11.cso.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: vikas kawadia X-Sender: kawadia@ux11.cso.uiuc.edu Reply-To: kawadia@uiuc.edu Subject: HW # 5 Clarifications Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 10 Date: Tue, 10 Oct 2000 17:59:28 -0500 NNTP-Posting-Host: 128.174.5.105 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 971218720 128.174.5.105 (Tue, 10 Oct 2000 17:58:40 CDT) NNTP-Posting-Date: Tue, 10 Oct 2000 17:58:40 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:31 Hello All, A clarification to HW5, prob 5 : Prob 5.3 c) The expression s_tilde(t) does not denote the complex envelope. It is simply the expression for narrowband FM. You just have to plot the magnitude of the fourier transform of the given expression. Also read |S_tilde(f)| as |S_tilde(w)|. Good luck. ..vikas From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!mikepery From: mikepery@is.so.fscked.org (Mike Perry) Newsgroups: uiuc.class.ece359 Subject: HW #2 2.5A? Message-Id: User-Agent: slrn/0.9.6.2 (Linux) Lines: 16 Date: Thu, 14 Sep 2000 05:38:58 GMT NNTP-Posting-Host: 128.174.252.72 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 968909938 128.174.252.72 (Thu, 14 Sep 2000 00:38:58 CDT) NNTP-Posting-Date: Thu, 14 Sep 2000 00:38:58 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:11 I am trying to use x+(t) = x(t) + jxh(t), but getting xh(t) is causing me problems. Are we supposed to express the result in terms of m(t) and mh(t)? If not, how do we take the hilbert transform of the sinc function? And what are the rules for the hilbert transform of mh(t)*sin(wot)? Am I making this too hard? I was thinking of trying to transform x(t) into X(w) and see what I could do that way, but that didn't seem like it would help since part b asks for that result after part a. -- Mike Perry http://so.fscked.org From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!staff2.cso.uiuc.edu!chadjic Newsgroups: uiuc.class.ece359 From: hadjicostis christoforos n X-Sender: chadjic@staff2.cso.uiuc.edu Subject: Re: HW #2 2.5A? In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 33 Date: Thu, 14 Sep 2000 13:10:41 -0500 NNTP-Posting-Host: 128.174.5.53 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 968954997 128.174.5.53 (Thu, 14 Sep 2000 13:09:57 CDT) NNTP-Posting-Date: Thu, 14 Sep 2000 13:09:57 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:12 Hi Mike, You can keep the answer in terms of mh(t), i.e., you do not have to explicitly solve for the Hilbert transform of a sinc. You may want to think about how you would do that though! C. Hadjicostis On Thu, 14 Sep 2000, Mike Perry wrote: > I am trying to use x+(t) = x(t) + jxh(t), but getting xh(t) is causing me > problems. > > Are we supposed to express the result in terms of m(t) and mh(t)? If > not, how do we take the hilbert transform of the sinc function? And what are > the rules for the hilbert transform of mh(t)*sin(wot)? > > > Am I making this too hard? I was thinking of trying to transform x(t) into X(w) > and see what I could do that way, but that didn't seem like it would help > since part b asks for that result after part a. > > > -- > Mike Perry > http://so.fscked.org > > From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!mikepery From: mikepery@is.so.fscked.org (Mike Perry) Newsgroups: uiuc.class.ece359 Subject: HW 3 questions Message-Id: User-Agent: slrn/0.9.6.2 (Linux) Lines: 15 Date: Thu, 21 Sep 2000 05:33:20 GMT NNTP-Posting-Host: 128.174.252.72 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969514400 128.174.252.72 (Thu, 21 Sep 2000 00:33:20 CDT) NNTP-Posting-Date: Thu, 21 Sep 2000 00:33:20 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:20 Ok, so I have another barrage of last minute questions: 1. In problem 3.1, I'm getting Acos(Wot)*Acos(Wot) after I simplify. From looking at the convolution integral, that looks infinite. Looking at it in fourier domain, it aprears to be just A^2cos(Wot)... I'm way off track here, aren't I? 2. Say I have a signal with baseband -B to B. When talking in terms of low pass filters, is the bandwith of a filter that would allow such a signal B, or 2B? And do you say a LPF of 0 to B? or a LPF of -B to B? 3. How come I'm the only one to post HW questions to the newsgroup? ;) -- Mike Perry http://so.fscked.org From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Rob Wade" Newsgroups: uiuc.class.ece359 References: Subject: Re: HW 3 questions Lines: 27 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-Proxy-Client: rwwade@uiuc.edu from c797614-a.chmpgn1.il.home.com Message-ID: Date: Thu, 21 Sep 2000 01:15:19 -0500 NNTP-Posting-Host: 128.174.5.27 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969516882 128.174.5.27 (Thu, 21 Sep 2000 01:14:42 CDT) NNTP-Posting-Date: Thu, 21 Sep 2000 01:14:42 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:21 1. Yes you're way off. Use the rms width. 2. Yes 2B and yes -B to B..... But where is that in the problem.... hmmmm I didn't see it... anyhow problem 2 is much easier check notes for simple equations and the assumptions for their use (no integration req). 3. Cuz if i post here my q's will never be answered by due date :) Mike Perry wrote in message news:slrn8sj77r.4cv.mikepery@fscked.org... > Ok, so I have another barrage of last minute questions: > 1. In problem 3.1, I'm getting Acos(Wot)*Acos(Wot) after I simplify. From > looking at the convolution integral, that looks infinite. Looking at it in > fourier domain, it aprears to be just A^2cos(Wot)... I'm way off track here, > aren't I? > > 2. Say I have a signal with baseband -B to B. When talking in terms of low > pass filters, is the bandwith of a filter that would allow such a signal B, or > 2B? And do you say a LPF of 0 to B? or a LPF of -B to B? > > 3. How come I'm the only one to post HW questions to the newsgroup? ;) > > -- > Mike Perry > http://so.fscked.org From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!eesn24.ews.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: Vikas Kawadia Subject: Re: HW 3 questions In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 26 Date: Thu, 21 Sep 2000 15:42:30 -0500 NNTP-Posting-Host: 130.126.161.208 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969568905 130.126.161.208 (Thu, 21 Sep 2000 15:41:45 CDT) NNTP-Posting-Date: Thu, 21 Sep 2000 15:41:45 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:23 1. Acos(Wot)*Acos(Wot) is convliution of a pulse with another pulse, why is it infinity. 2. Band width is B for such a case by convention. ..vikas On Thu, 21 Sep 2000, Mike Perry wrote: > Ok, so I have another barrage of last minute questions: > 1. In problem 3.1, I'm getting Acos(Wot)*Acos(Wot) after I simplify. From > looking at the convolution integral, that looks infinite. Looking at it in > fourier domain, it aprears to be just A^2cos(Wot)... I'm way off track here, > aren't I? > > 2. Say I have a signal with baseband -B to B. When talking in terms of low > pass filters, is the bandwith of a filter that would allow such a signal B, or > 2B? And do you say a LPF of 0 to B? or a LPF of -B to B? > > 3. How come I'm the only one to post HW questions to the newsgroup? ;) > > -- > Mike Perry > http://so.fscked.org > From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Rob Wade" Newsgroups: uiuc.class.ece359 Subject: HW#3 Lines: 11 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-Proxy-Client: rwwade@uiuc.edu from c797614-a.chmpgn1.il.home.com Message-ID: <1Ohy5.1280$rr.24867@vixen.cso.uiuc.edu> Date: Thu, 21 Sep 2000 01:22:27 -0500 NNTP-Posting-Host: 128.174.5.27 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969517309 128.174.5.27 (Thu, 21 Sep 2000 01:21:49 CDT) NNTP-Posting-Date: Thu, 21 Sep 2000 01:21:49 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:22 I don't know about the rest of you. But i had some issues with #2 and the part of #3 we never covered in class.... I wanna learn this stuff cuz it's pertenant to my field of work so I'd like to see the due date pushed to tuesday so i can ask q's and so we can cover the homework in terms of material. I got most of it done because of knowledge of previous class but this can not be fair to those ppl seeing this for first time... Anyhow, just my opinion. -Rob From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!staff2.cso.uiuc.edu!chadjic Newsgroups: uiuc.class.ece359 From: hadjicostis christoforos n X-Sender: chadjic@staff2.cso.uiuc.edu Subject: Re: HW#3 In-Reply-To: <1Ohy5.1280$rr.24867@vixen.cso.uiuc.edu> Message-ID: References: <1Ohy5.1280$rr.24867@vixen.cso.uiuc.edu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 30 Date: Thu, 21 Sep 2000 16:00:26 -0500 NNTP-Posting-Host: 128.174.5.53 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969569980 128.174.5.53 (Thu, 21 Sep 2000 15:59:40 CDT) NNTP-Posting-Date: Thu, 21 Sep 2000 15:59:40 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:25 Hi Rob, If you check your notes, you will realize that problems 3.2 and 3.3 were indeed covered in class (in fact, we spend about a lecture on this material). Part of it also appears in the textbook. C. Hadjicostis. PS: Which is the previous class that you are referring too? On Thu, 21 Sep 2000, Rob Wade wrote: > I don't know about the rest of you. But i had some issues with #2 and the > part of #3 we never covered in class.... I wanna learn this stuff cuz it's > pertenant to my field of work so I'd like to see the due date pushed to > tuesday so i can ask q's and so we can cover the homework in terms of > material. I got most of it done because of knowledge of previous class but > this can not be fair to those ppl seeing this for first time... Anyhow, just > my opinion. > -Rob > > > > > From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Rob Wade" Newsgroups: uiuc.class.ece359 References: <1Ohy5.1280$rr.24867@vixen.cso.uiuc.edu> Subject: Re: HW#3 Lines: 40 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-Proxy-Client: rwwade@uiuc.edu from c797614-a.chmpgn1.il.home.com Message-ID: Date: Thu, 21 Sep 2000 16:58:14 -0500 NNTP-Posting-Host: 128.174.5.27 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969573459 128.174.5.27 (Thu, 21 Sep 2000 16:57:39 CDT) NNTP-Posting-Date: Thu, 21 Sep 2000 16:57:39 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:26 Sorry about that that was meant for another class... opps :) hadjicostis christoforos n wrote in message news:Pine.GSO.4.10.10009211555320.15836-100000@staff2.cso.uiuc.edu... > > > Hi Rob, > > If you check your notes, you will realize that problems 3.2 and 3.3 were > indeed covered in class (in fact, we spend about a lecture on this > material). Part of it also appears in the textbook. > > C. Hadjicostis. > > > PS: Which is the previous class that you are referring too? > > > On Thu, 21 Sep 2000, Rob Wade wrote: > > > I don't know about the rest of you. But i had some issues with #2 and the > > part of #3 we never covered in class.... I wanna learn this stuff cuz it's > > pertenant to my field of work so I'd like to see the due date pushed to > > tuesday so i can ask q's and so we can cover the homework in terms of > > material. I got most of it done because of knowledge of previous class but > > this can not be fair to those ppl seeing this for first time... Anyhow, just > > my opinion. > > -Rob > > > > > > > > > > > From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Mark Brady" Newsgroups: uiuc.class.ece359 Subject: HW7 Solution Question Lines: 21 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Message-ID: Date: Thu, 26 Oct 2000 17:01:59 -0500 NNTP-Posting-Host: 130.126.218.13 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 972597666 130.126.218.13 (Thu, 26 Oct 2000 17:01:06 CDT) NNTP-Posting-Date: Thu, 26 Oct 2000 17:01:06 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:36 Dear Prof or TA, I have a quick question about the solution (Set 7) that was passed out today. In part 7.3, the defined quantity C is given as sqrt( 4*ln(sqrt(2)*p0/p1)) For p1 > sqrt(2)*p0, C is imaginary, and so the decision rule given doesn't make sense to me. Is there supposed to be an |x| in there somewhere? If so, could you also tell how this affects the subsequent parts? Then in part(c), the definition of C is changed to 4*ln(sqrt(2)*p0/p1), but again I don't follow. Thanks, Mark From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!staff1.cso.uiuc.edu!chadjic Newsgroups: uiuc.class.ece359 From: hadjicostis christoforos n X-Sender: chadjic@staff1.cso.uiuc.edu Subject: Re: HW7 Solution Question In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 54 Date: Fri, 27 Oct 2000 17:42:34 -0500 NNTP-Posting-Host: 128.174.5.59 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 972686501 128.174.5.59 (Fri, 27 Oct 2000 17:41:41 CDT) NNTP-Posting-Date: Fri, 27 Oct 2000 17:41:41 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:37 Hi Mark, I am glad that you brought this up. In fact, we have actually talked with some students about this issue during office hours... Here are some clarifications: 1) If sqrt(2)*p0/p1 is greater than 1, then the solution in parts a) and b) stands as given. 2) If sqrt(2)*p0/p1 is smaller than 1, then the decision rule is always going to decide H1 (because exp{r^2 / 4} is always greater or equal than 1). Therefore, in part b), the probability of error is the probability that H0 takes place (i.e., Pr(error) = p0). 3) In part c), the definition of C should have been as in part a). In addition, it should say that C is IMAGINARY if sqrt(2)*p0/p1 is smaller than 1. In such case, however, it is clear that the rule will always decide in favor of H1: to see this, we actually have to look at the decision rule BEFORE taking the logarithm (and realize that e to a positive power is always larger or equal to 1). I hope this helps, Chris. On Thu, 26 Oct 2000, Mark Brady wrote: > Dear Prof or TA, > > I have a quick question about the solution (Set 7) that was passed out > today. In part 7.3, the defined quantity C is given as > > sqrt( 4*ln(sqrt(2)*p0/p1)) > > For p1 > sqrt(2)*p0, C is imaginary, and so the decision rule given > doesn't make sense to me. Is there supposed to be an |x| in there > somewhere? If so, could you also tell how this affects the subsequent > parts? > > Then in part(c), the definition of C is changed to 4*ln(sqrt(2)*p0/p1), but > again I don't follow. > > Thanks, > Mark > > > > > > From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Rob Wade" Newsgroups: uiuc.class.ece359 Subject: Is there any way the TA can change his office hours Lines: 10 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-Proxy-Client: rwwade@uiuc.edu from c797614-a.chmpgn1.il.home.com Message-ID: Date: Fri, 15 Sep 2000 04:08:24 -0500 NNTP-Posting-Host: 128.174.5.27 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969008869 128.174.5.27 (Fri, 15 Sep 2000 04:07:49 CDT) NNTP-Posting-Date: Fri, 15 Sep 2000 04:07:49 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:13 Some of the math is frustrating me.... I took this stuff 3 yrs ago. Anyhow I was wondering if the TA could add or change office ours to a diff time... Let me know, any time on mon, wed, or friday NOT between 3-5pm would work or after 3pm on tues / thurs. Maybe add another TA for the course considering the class size and the fact that the current TA must be real busy. :~) Just a thought. Thanks, -Rob From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!eesn34.ews.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: Vikas Kawadia Subject: Re: Is there any way the TA can change his office hours In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 21 Date: Sun, 17 Sep 2000 03:29:09 -0500 NNTP-Posting-Host: 130.126.161.218 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969179305 130.126.161.218 (Sun, 17 Sep 2000 03:28:25 CDT) NNTP-Posting-Date: Sun, 17 Sep 2000 03:28:25 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:14 I already have office hours on Friday also from 12.00 to 1.50 in addition to Wednesday from 3 to 5. ..vikas On Fri, 15 Sep 2000, Rob Wade wrote: > Some of the math is frustrating me.... I took this stuff 3 yrs ago. Anyhow I > was wondering if the TA could add or change office ours to a diff time... > Let me know, any time on mon, wed, or friday NOT between 3-5pm would work or > after 3pm on tues / thurs. Maybe add another TA for the course considering > the class size and the fact that the current TA must be real busy. :~) Just > a thought. > Thanks, > -Rob > > > From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!ux8.cso.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: vikas kawadia X-Sender: kawadia@ux8.cso.uiuc.edu Reply-To: kawadia@uiuc.edu Subject: Last year's exam 2. Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 8 Date: Wed, 1 Nov 2000 02:03:57 -0600 NNTP-Posting-Host: 128.174.5.44 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 973065786 128.174.5.44 (Wed, 01 Nov 2000 02:03:06 CST) NNTP-Posting-Date: Wed, 01 Nov 2000 02:03:06 CST Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:38 Hi all, Last year's Exam 2 has been posted on the webpage. You can access it through the old exmas button at the bottom or the complete URL is http://www.ece.uiuc.edu/ece359/old_exams/old_exams.html Good luck. ..vikas From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!ux13.cso.uiuc.edu!lettow Newsgroups: uiuc.class.ece359 From: Chris Lettow X-Sender: lettow@ux13.cso.uiuc.edu Subject: lost Lathi book in office hours Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 10 Date: Wed, 11 Oct 2000 23:11:24 -0500 NNTP-Posting-Host: 128.174.5.25 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 971323835 128.174.5.25 (Wed, 11 Oct 2000 23:10:35 CDT) NNTP-Posting-Date: Wed, 11 Oct 2000 23:10:35 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:32 I was just wondering if anyone found or picked up a Lathi book in the conference room during Prof. Hadjicostis's office hours today. I think I left mine in there. Thanks for your help! Chris From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Rob Wade" Newsgroups: uiuc.class.ece359 Subject: MMSE Lines: 6 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-Proxy-Client: rwwade@uiuc.edu from c797614-a.chmpgn1.il.home.com Message-ID: Date: Wed, 8 Nov 2000 21:44:53 -0600 NNTP-Posting-Host: 128.174.5.27 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 973741480 128.174.5.27 (Wed, 08 Nov 2000 21:44:40 CST) NNTP-Posting-Date: Wed, 08 Nov 2000 21:44:40 CST Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:40 Can someone help explain what and how MMSE is used I'm confused. It never made sense in class. A generic layman terms explaination will do. Thanks, -Rob From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!staff2.cso.uiuc.edu!chadjic Newsgroups: uiuc.class.ece359 From: hadjicostis christoforos n X-Sender: chadjic@staff2.cso.uiuc.edu Subject: Re: MMSE In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 31 Date: Thu, 9 Nov 2000 01:55:36 -0600 NNTP-Posting-Host: 128.174.5.53 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 973756483 128.174.5.53 (Thu, 09 Nov 2000 01:54:43 CST) NNTP-Posting-Date: Thu, 09 Nov 2000 01:54:43 CST Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:41 The MMSE is an estimator for a certain quantity X based on measurements of a different quantity Y. In the setting we discussed in class, we assumed that we have a probabilistic setting that describes how X and Y are related (for example, we know the joint density of X AND Y, or we know the conditional probability density of X given Y=y for every value of y). Based on these probabilistic relations between X and Y we showed that given the observation that Y=y, the estimator Xhat(y) = E[X|Y=y] is the estimate of X that minimizes the mean square error, i.e., it minimizes the E[(Xhat(y)-X)^2]. We also argued that it minimizes the conditional mean square error, i.e., E[(Xhat(y)-X)^2 | Y=y] for every possible y. I hope this helps. Good luck to everybody tomorrow. C. Hadjicostis On Wed, 8 Nov 2000, Rob Wade wrote: > Can someone help explain what and how MMSE is used I'm confused. It never > made sense in class. A generic layman terms explaination will do. > Thanks, > -Rob > > > > From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!eesn24.ews.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: Vikas Kawadia Subject: Office hours delayed Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 5 Date: Thu, 21 Sep 2000 15:43:56 -0500 NNTP-Posting-Host: 130.126.161.208 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969568991 130.126.161.208 (Thu, 21 Sep 2000 15:43:11 CDT) NNTP-Posting-Date: Thu, 21 Sep 2000 15:43:11 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:24 My office hours tomorrow will be delayed by 30 mins. So I will be there from 12.30 to 1.50. ..vikas From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!staff1.cso.uiuc.edu!chadjic Newsgroups: uiuc.class.ece359 From: hadjicostis christoforos n X-Sender: chadjic@staff1.cso.uiuc.edu Subject: Office hours tomorrow Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 11 Date: Tue, 17 Oct 2000 23:14:59 -0500 NNTP-Posting-Host: 128.174.5.59 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 971842448 128.174.5.59 (Tue, 17 Oct 2000 23:14:08 CDT) NNTP-Posting-Date: Tue, 17 Oct 2000 23:14:08 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:33 In response to many requests I will have office hours tomorrow afternoon from 2-3 in my office (148 C&SRL). In case a lot of people show up, we will move into 154 C&SRL. Of course, Vikas will have his regular office hours from 3-5 in 330N Everitt Lab. C. Hadjicostis. From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!ux4.cso.uiuc.edu!allorens Newsgroups: uiuc.class.ece359 From: "SoulStice." X-Sender: allorens@ux4.cso.uiuc.edu Subject: One question... Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 5 Date: Sun, 27 Aug 2000 11:39:43 -0500 NNTP-Posting-Host: 128.174.5.62 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 967394341 128.174.5.62 (Sun, 27 Aug 2000 11:39:01 CDT) NNTP-Posting-Date: Sun, 27 Aug 2000 11:39:01 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:3 Are we going to get a bigger classroom?? From - Mon Dec 11 13:22:24 2000 Path: vixen.cso.uiuc.edu!ux4.cso.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: vikas kawadia X-Sender: kawadia@ux4.cso.uiuc.edu Reply-To: kawadia@uiuc.edu Subject: Prob 11.4 Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 10 Date: Sun, 10 Dec 2000 19:08:13 -0600 NNTP-Posting-Host: 128.174.5.62 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 976496835 128.174.5.62 (Sun, 10 Dec 2000 19:07:15 CST) NNTP-Posting-Date: Sun, 10 Dec 2000 19:07:15 CST Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:47 Solution to prob 11.4 is wrong. Here we should proceed by expressing the given process in terms of its quadrature and in-phase components. Both of these will be found to be gaussian. This has also been worked out on page 519 of the book in the section "Bandpass white gaussian Random process". The pdf of the envelope of two gaussian pdf's is actually a Rayleigh pdf as shown in example 10.14 of the book. So the answer is that the pdf of the envelope will be a Rayleigh density. ..vikas From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!staff2.cso.uiuc.edu!chadjic Newsgroups: uiuc.class.ece359 From: hadjicostis christoforos n X-Sender: chadjic@staff2.cso.uiuc.edu Subject: Problems 10.5-10.8 postponed Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 8 Date: Tue, 28 Nov 2000 17:41:24 -0600 NNTP-Posting-Host: 128.174.5.53 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 975454830 128.174.5.53 (Tue, 28 Nov 2000 17:40:30 CST) NNTP-Posting-Date: Tue, 28 Nov 2000 17:40:30 CST Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:42 Given that we did not complete the discussion on bandpass noise today, problems 10.5-10.8 will not be due this Thursday. They will be included in the next problem set. Chris Hadjicostis From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Rob Wade" Newsgroups: uiuc.class.ece359 Subject: Professors Hadjicostis Office hours Tomorrow Lines: 14 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-Proxy-Client: rwwade@uiuc.edu from c797614-a.chmpgn1.il.home.com Message-ID: <3ZXU5.4378$4h2.79272@vixen.cso.uiuc.edu> Date: Tue, 28 Nov 2000 18:20:47 -0600 NNTP-Posting-Host: 128.174.5.27 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 975457215 128.174.5.27 (Tue, 28 Nov 2000 18:20:15 CST) NNTP-Posting-Date: Tue, 28 Nov 2000 18:20:15 CST Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:43 Just wondering if the office hours for tomorrow morning are on and if so when and where. Thanks, -Rob -- Robert Wade Computer Engineering Senior University of Illinois Urbana-Champaign rwwade@uiuc.edu From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!staff1.cso.uiuc.edu!chadjic Newsgroups: uiuc.class.ece359 From: hadjicostis christoforos n X-Sender: chadjic@staff1.cso.uiuc.edu Subject: Re: Professors Hadjicostis Office hours Tomorrow In-Reply-To: <3ZXU5.4378$4h2.79272@vixen.cso.uiuc.edu> Message-ID: References: <3ZXU5.4378$4h2.79272@vixen.cso.uiuc.edu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 33 Date: Tue, 28 Nov 2000 20:16:17 -0600 NNTP-Posting-Host: 128.174.5.59 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 975464118 128.174.5.59 (Tue, 28 Nov 2000 20:15:18 CST) NNTP-Posting-Date: Tue, 28 Nov 2000 20:15:18 CST Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:44 I will be having office hours tomorrow (Wednesday) at 1:00 in my office. Also, this question came up with some students so I thought it would help the rest of you: in problem 10.4, the signal m(t) is deterministic. Therefore, you have to use the power of the message signal (instead of the average power of the message signal) in calculating the SNR. --CH On Tue, 28 Nov 2000, Rob Wade wrote: > Just wondering if the office hours for tomorrow morning are on and if so > when and where. > Thanks, > -Rob > > > -- > Robert Wade > Computer Engineering Senior > University of Illinois Urbana-Champaign > rwwade@uiuc.edu > > > > > From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!ux5.cso.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: vikas kawadia X-Sender: kawadia@ux5.cso.uiuc.edu Reply-To: kawadia@uiuc.edu Subject: PS11 and old Final exam Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 7 Date: Thu, 30 Nov 2000 15:37:15 -0600 NNTP-Posting-Host: 128.174.5.45 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 975620178 128.174.5.45 (Thu, 30 Nov 2000 15:36:18 CST) NNTP-Posting-Date: Thu, 30 Nov 2000 15:36:18 CST Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:45 The old final exam and Problem set 11 has been posted on the web page. The url for the old exam is : http://www.ece.uiuc.edu/ece359/old_exams/old_exams.html Good luck. ..vikas From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!staff2.cso.uiuc.edu!chadjic Newsgroups: uiuc.class.ece359 From: hadjicostis christoforos n X-Sender: chadjic@staff2.cso.uiuc.edu Subject: Review for ECE 359 Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 11 Date: Tue, 26 Sep 2000 19:15:17 -0500 NNTP-Posting-Host: 128.174.5.53 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 970013672 128.174.5.53 (Tue, 26 Sep 2000 19:14:32 CDT) NNTP-Posting-Date: Tue, 26 Sep 2000 19:14:32 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:27 A review session for ECE 359 will be held from 5-7 on Wednesday in room 161 Everitt Laboratory. Vikas will answer questions and go over last year's exam. Vika's office hours from 3-5 on Wednesday are CANCELLED. C. Hadjicostis. From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!ux4.cso.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: vikas kawadia X-Sender: kawadia@ux4.cso.uiuc.edu Reply-To: kawadia@uiuc.edu Subject: Review Session Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 6 Date: Sun, 5 Nov 2000 01:13:45 -0600 NNTP-Posting-Host: 128.174.5.62 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 973408372 128.174.5.62 (Sun, 05 Nov 2000 01:12:52 CST) NNTP-Posting-Date: Sun, 05 Nov 2000 01:12:52 CST Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:39 hello people, A review session will be held on Monday the 6th Nov. from 5.00 to 7.00 pm in Room 161 EL. Problems from exam 2, fall 99 will be discussed. ..vikas From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!ux10.cso.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: vikas kawadia X-Sender: kawadia@ux10.cso.uiuc.edu Reply-To: kawadia@uiuc.edu Subject: Review session Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 5 Date: Tue, 5 Dec 2000 18:36:53 -0600 NNTP-Posting-Host: 128.174.5.79 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 976062954 128.174.5.79 (Tue, 05 Dec 2000 18:35:54 CST) NNTP-Posting-Date: Tue, 05 Dec 2000 18:35:54 CST Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:46 There will be a review session on Friday from 5.00 to 7.00 in room 161EL. I will go ove last year's final exam. ..vikas From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!staff1.cso.uiuc.edu!chadjic Newsgroups: uiuc.class.ece359 From: hadjicostis christoforos n X-Sender: chadjic@staff1.cso.uiuc.edu Subject: Typo in problem 3.3 Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 12 Date: Wed, 20 Sep 2000 01:28:56 -0500 NNTP-Posting-Host: 128.174.5.59 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 969431292 128.174.5.59 (Wed, 20 Sep 2000 01:28:12 CDT) NNTP-Posting-Date: Wed, 20 Sep 2000 01:28:12 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:17 There is a typo in problem 3.3. The signal m(t) should be defined as sinc(2 pi t / T). I hope this has not created too much of a problem. C. Hadjicostis PS: If you have solved the problem using the stated m(t), you do NOT have to redo the problem. From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!glsn3.ews.uiuc.edu!kawadia Newsgroups: uiuc.class.ece359 From: kawadia vikas Subject: Welcome Message Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 26 Date: Fri, 25 Aug 2000 01:16:40 -0500 NNTP-Posting-Host: 130.126.160.89 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 967184160 130.126.160.89 (Fri, 25 Aug 2000 01:16:00 CDT) NNTP-Posting-Date: Fri, 25 Aug 2000 01:16:00 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:2 Welcome to ECE359 Communications-I for FAll 2000. The prime purpose of this newsgroup is to facilitate discussion among the students taking this class. Please note the following policies regarding the usage of this group. 1. Discussion among students is strongly encouraged on the group. You can post doubts you have or confusions regarding homework assignments. DO NOT post explicit solutions or answers to assignments before it is due. 2. Do not expect the TA or the professor to check messages all day. The messages will be checked at least once a day (mostly evenings) on week days. 3. Keep looking at the posted messages so that you do not ask questions which have already been asked. Redundant questions may not be answered. The newsgroup is a good place to look for typos/errors in assignments. 4. Only messages pertinent to the course should be posted. Good Luck and have fun. Vikas ECE359 TA From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Mark Brady" Newsgroups: uiuc.class.ece359 Subject: Which sinc, CTFT ? Lines: 17 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Message-ID: Date: Thu, 31 Aug 2000 23:03:34 -0500 NNTP-Posting-Host: 130.126.218.13 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 967780972 130.126.218.13 (Thu, 31 Aug 2000 23:02:52 CDT) NNTP-Posting-Date: Thu, 31 Aug 2000 23:02:52 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:4 Could a TA/Prof. please resolve the definitions of the Fourier transform and sinc function? In Lathi, (the required text), sinc is defined in the manner of sin(x)/x, which is the same as in 210, 310, and 320. Today in lecture, sinc(x) was defined as sin(pi*x)/(pi*x). In Lathi, the CTFT (Continuous-Time Fourier Transform) is defined as Integral(x(t)*e^(-j*omega*t)dt) (from -inf to +inf). Today in class it was presented as Integral(x(t)*e^(-j*2*pi*f*t)dt) (from -inf to +inf). How do we do the homework? Exams? For example, HW 1.5 ? Thanks Mark From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!ux11.cso.uiuc.edu!who Newsgroups: uiuc.class.ece359 From: "William W. Ho" X-Sender: who@ux11.cso.uiuc.edu Subject: Re: Which sinc, CTFT ? In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Lines: 36 Date: Thu, 31 Aug 2000 23:44:39 -0500 NNTP-Posting-Host: 128.174.5.105 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 967783438 128.174.5.105 (Thu, 31 Aug 2000 23:43:58 CDT) NNTP-Posting-Date: Thu, 31 Aug 2000 23:43:58 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:5 The Fourier equations you wrote are both the same. Omega=2*pi*f. =================================================== William W. Ho University of Illinois, Urbana-Champaign, ECE Chief Financial Officer, OTCR Teaching Assistant, ECE 290 "You treat a disease, you win or lose. You treat a patient, I guarantee you always win!" Patch, "Patch Adams" On Thu, 31 Aug 2000, Mark Brady wrote: > Could a TA/Prof. please resolve the definitions of the Fourier transform and > sinc function? > > In Lathi, (the required text), sinc is defined in the manner of sin(x)/x, > which is the same as in 210, 310, and 320. Today in lecture, sinc(x) was > defined as sin(pi*x)/(pi*x). > > In Lathi, the CTFT (Continuous-Time Fourier Transform) is defined as > Integral(x(t)*e^(-j*omega*t)dt) (from -inf to +inf). Today in class it was > presented as Integral(x(t)*e^(-j*2*pi*f*t)dt) (from -inf to +inf). > > How do we do the homework? Exams? For example, HW 1.5 ? > > Thanks > Mark > > > > From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Mark Brady" Newsgroups: uiuc.class.ece359 References: Subject: Re: Which sinc, CTFT ? Lines: 14 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Message-ID: Date: Fri, 1 Sep 2000 08:09:36 -0500 NNTP-Posting-Host: 130.126.218.13 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 967813737 130.126.218.13 (Fri, 01 Sep 2000 08:08:57 CDT) NNTP-Posting-Date: Fri, 01 Sep 2000 08:08:57 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:6 "William W. Ho" wrote: Pine.GSO.4.10.10008312343570.9187-100000@ux11.cso.uiuc.edu... > The Fourier equations you wrote are both the same. Omega=2*pi*f. That's true. What I mean to ask is: when we're asked to take a Fourier transform, are we looking for a result with omega's or f's in it? Or no difference? thanks -Mark (and also the def'n of sinc?) From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!not-for-mail Message-ID: <39B04C1D.5AC368E1@control.csl.uiuc.edu> From: Christoforos Hadjicostis X-Mailer: Mozilla 4.73 [en] (X11; I; SunOS 5.6 sun4u) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: uiuc.class.ece359 Subject: Re: Which sinc, CTFT ? References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 38 Date: Fri, 01 Sep 2000 19:38:53 -0500 NNTP-Posting-Host: 130.126.138.1 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 967855088 130.126.138.1 (Fri, 01 Sep 2000 19:38:08 CDT) NNTP-Posting-Date: Fri, 01 Sep 2000 19:38:08 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:7 Mark Brady wrote: > "William W. Ho" wrote: > Pine.GSO.4.10.10008312343570.9187-100000@ux11.cso.uiuc.edu... > > The Fourier equations you wrote are both the same. Omega=2*pi*f. > > That's true. What I mean to ask is: when we're asked to take a Fourier > transform, are we looking for a result with omega's or f's in it? Or no > difference? > > thanks > -Mark > > (and also the def'n of sinc?) Both William and Mark raise good points. Ideally, we should be able to work with both omega's and f's and with both definitions of the sinc function. To make our life simpler, however, we will follow the notation of the textbook. Therefore, we will express Fourier transforms in terms of omega and the sinc(x) as sin(x)/x. To make sure that everything is clear, I will make an announcement on Tuesday in class. -- Christoforos Hadjicostis Assistant Professor University of Illinois at Urbana-Champaign 148 Computer and Systems Research Laboratory 1308 West Main Street Urbana, IL 61801 Tel: 217-265-8259 Fax: 217-244-1653 email: chadjic@control.csl.uiuc.edu http://www.ece.uiuc.edu/fachtml/hadjicostis.html From - Mon Dec 11 13:22:25 2000 Path: vixen.cso.uiuc.edu!not-for-mail From: "Rob Wade" Newsgroups: uiuc.class.ece359 Subject: Wow Lines: 6 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.00.2615.200 X-Mimeole: Produced By Microsoft MimeOLE V5.00.2615.200 X-Proxy-Client: rwwade@uiuc.edu from c797614-a.chmpgn1.il.home.com Message-ID: Date: Thu, 28 Sep 2000 15:14:15 -0500 NNTP-Posting-Host: 128.174.5.27 X-Complaints-To: abuse@uiuc.edu X-Trace: vixen.cso.uiuc.edu 970172018 128.174.5.27 (Thu, 28 Sep 2000 15:13:38 CDT) NNTP-Posting-Date: Thu, 28 Sep 2000 15:13:38 CDT Organization: University of Illinois at Urbana-Champaign Xref: vixen.cso.uiuc.edu uiuc.class.ece359:28 Just had to post that after that test.... The avg becomes ever so much more important now. :) -Rob