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Yi Xiao

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21 Mar 2009 Alamouti STBC Discuss 2Tx. 1Rx transmit diversity scheme called Alamouti Space Time Block Coding (STBC) Author: Krishna Sankar M

Thank u, it helps a lot. By the way, could u please recommend me some paper or articles that talk about the scaling factor problem for Alamouti's code in higher order modulation?

I am studing on Alamouti's paper and I can get the same simulation result when using BPSK but not for QPSK, ur code inspires me alot and I want to learn more about scaling factor u mentioned.

Thanks again.

18 Mar 2009 Alamouti STBC Discuss 2Tx. 1Rx transmit diversity scheme called Alamouti Space Time Block Coding (STBC) Author: Krishna Sankar M

Very good! Clear codes and explanation.

Only one question, why we need these lines:
    yHat = sum(hEq.*yMod,1)./hEqPower;
    yHat(2:2:end) = conj(yHat(2:2:end));

I mean, if the decision rule is: ipHat = real(yHat)>0;
Then
yHat = sum(hEq.*yMod,1)
will be enough for everything.
Why do we need to divide it by the power of the channel and do the conjugate for
h2*y1 -h1y2* ?
I am a little bit confused here.

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