Comments on: Softbit for 16QAM

By: Krishna Sankar

Krishna Sankar — Mon, 21 Jun 2010 00:45:14 +0000

@Mohamed Hedi: You can look at articles @ http://www.dsplog.com/tag/qam
Hopefully, it helps.

By: Mohamed Hedi

Mohamed Hedi — Sun, 20 Jun 2010 07:48:25 +0000

Hi,
I am working on a QAM-16 modem,
can you help me please to implement it on MTLAB
regards

By: Krishna Sankar

Krishna Sankar — Wed, 14 Apr 2010 00:18:51 +0000

@xiaonaren: Am not sure of the case where there is ISI. However, if its only flat fading, the above equations with additional scaling factor for channel gain should hold good

By: xiaonaren

xiaonaren — Thu, 08 Apr 2010 09:18:40 +0000

hello krishna
I have a question, as for the softbit for 16-QAM, if the channel is not AWGN but exponentical decay , how can I get the softbit?
Thanks,
xiaonaren

By: Krishna Sankar

Krishna Sankar — Mon, 29 Mar 2010 01:34:11 +0000

@sam: Well with 4-PSK, the modulation is performed on two orthogonal dimensions. Hence the noise added on one dimension will not affect the other. Hence the BER is the same.

By: sam

sam — Sun, 28 Mar 2010 16:05:46 +0000

hello krishna
i have a question , why two and four phase psk have same figure in plotting of SNR (per bit)(horizontal axis) in term Pb (probability of error)(vertical axis)? in page 225 of digital communication proakis 5ed
any good reference for complete explanation

By: Krishna Sankar

Krishna Sankar — Wed, 09 Sep 2009 00:54:44 +0000

@ruoyu: Glad