Comments on: Symbol Error Rate (SER) for 4-PAM http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/ Signal Processing for Communication Thu, 04 Mar 2010 16:31:39 +0530 http://wordpress.org/?v=2.8.4 hourly 1 By: Martin http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-16871 Martin Wed, 09 Dec 2009 18:22:57 +0000 http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-16871 Oh thank you. I forgot the sqrt(No). What a mistake. Oh thank you. I forgot the sqrt(No). What a mistake.

]]> By: Krishna Sankar http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-16661 Krishna Sankar Sun, 06 Dec 2009 23:20:41 +0000 http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-16661 @Martin: You can substitute z =(y - 3sqrt(Es/5))/sqrt(N0). With that substitution, the limits change from -Inf to 2sqrt(Es/5) to -Inf to -sqrt(Es/(5N0)). The latter is same integral from sqrt(Es/(5N0)) to Inf. Agree? @Martin: You can substitute z =(y – 3sqrt(Es/5))/sqrt(N0). With that substitution, the limits change from -Inf to 2sqrt(Es/5) to -Inf to -sqrt(Es/(5N0)). The latter is same integral from sqrt(Es/(5N0)) to Inf.
Agree?

]]> By: Martin http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-15942 Martin Tue, 24 Nov 2009 02:58:06 +0000 http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-15942 Hi, Unfortunately, my mathematics got a little bit rusty. Could you help me with the step where you calculated p(e/s3)? I'm not sure how you got to the erfc() form --> First, the limits were "-inf" to "2*sqrt(Eb/5)", than " " to "inf". I tried to substitute as you did. --> z=y - sqrt(..) --> dz/dy=1 --> limits z=-inf -sqr() = -inf ....so its -inf , you ..you know. Additionally, how you got the N0 into the limits. Sorry, I really forgot how to do this. Orginally, I wanted to calculated the same as you did but with the Q() function. Thanks, Martin Hi,
Unfortunately, my mathematics got a little bit rusty. Could you help me with the step where you calculated p(e/s3)? I’m not sure how you got to the erfc() form –> First, the limits were “-inf” to “2*sqrt(Eb/5)”, than ” ” to “inf”. I tried to substitute as you did. –> z=y – sqrt(..) –> dz/dy=1 –> limits z=-inf -sqr() = -inf ….so its -inf , you ..you know. Additionally, how you got the N0 into the limits. Sorry, I really forgot how to do this. Orginally, I wanted to calculated the same as you did but with the Q() function.

Thanks,
Martin

]]> By: youcef http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-15417 youcef Fri, 13 Nov 2009 00:37:55 +0000 http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-15417 Hi guys! What happens if the messages are not equipropable??? I got a problem with defiining the thresholds. Hi guys!
What happens if the messages are not equipropable???
I got a problem with defiining the thresholds.

]]> By: Krishna Sankar http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-15416 Krishna Sankar Fri, 13 Nov 2009 00:37:27 +0000 http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-15416 @Richard: I have not assumed any coding in this writeup. Maybe I did not understand your query. @Richard: I have not assumed any coding in this writeup. Maybe I did not understand your query.

]]> By: Richard http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-15330 Richard Wed, 11 Nov 2009 23:15:22 +0000 http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-15330 What is the formula for theoretical value? I would like to find coding gain. I saw a formula at your page: http://www.commsdesign.com/article/printableArticle.jhtml?articleID=208802825 The formula is near the end of the article. Should I use that? Thanks in advance. What is the formula for theoretical value? I would like to find coding gain.
I saw a formula at your page:
http://www.commsdesign.com/article/printableArticle.jhtml?articleID=208802825
The formula is near the end of the article. Should I use that?

Thanks in advance.

]]> By: Krishna Sankar http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-13763 Krishna Sankar Mon, 12 Oct 2009 23:54:33 +0000 http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/#comment-13763 @Richard: For finding the symbol error rate, compare the transmit and received constellation points. For computing BER, convert the received constellation into code bits, perform decoding and then compare the transmit and received bits. Good luck. @Richard: For finding the symbol error rate, compare the transmit and received constellation points. For computing BER, convert the received constellation into code bits, perform decoding and then compare the transmit and received bits. Good luck.

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