Comments on: BER for BPSK in ISI channel with MMSE equalization

By: Krishna Sankar

Krishna Sankar — Sun, 29 Jan 2012 00:53:01 +0000

@mayuri: Hmm… in general, one can find the difference between the desired and the obtained estimates, take the square and average over many realizations.

By: mayuri

mayuri — Fri, 27 Jan 2012 10:11:49 +0000

hi,
sir i want 2 knw how can we calculate mean square error of timing estimation using qpsk modulation and training sequenece?i mean to say that if i want to send a frame such that it has 256 bit fft size and training sequence is been used as cyclic prefix which is of 16 bit then how can i plot a graph of mean square error of timing and frequency estimation v/s snr?

By: Krishna Sankar

Krishna Sankar — Wed, 04 Jan 2012 00:32:33 +0000

@Waheed: Zero padding at which point?

By: Waheed

Waheed — Tue, 03 Jan 2012 05:37:59 +0000

Is zero Padding necessary?

By: Krishna Sankar

Krishna Sankar — Sun, 22 May 2011 22:04:48 +0000

@thavamaran: I guess, because the equalizer has a 3 tap delay, plus the delay of the channel. In practical systems, this delay needs to be estimated.

By: thavamaran

thavamaran — Tue, 17 May 2011 17:48:40 +0000

Hi Krishna, how are you? I just have this question, how do you exactly used K+2 for yFilt_zf = yFilt_zf(K+2:end);

Thank you.

By: Krishna Sankar

Krishna Sankar — Thu, 22 Jul 2010 01:01:39 +0000

@joel:
1) Well, [inv(hM)*d.'].’ is not convolution. Its just the matrix multiplication as we derived.
2) Try Digital Communication by Proakis.

Further, I liked the material presented in http://www.complextoreal.com/chapters/filters.pdf (pages 20-30)