802.11g Demodulation in WLAN Toolbox MATLAB 2017b

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I am using the WLAN Tool Box of MATLAB V2107b.
A term named CSI for each data subcarrier is defined as
CSI(i) = H(i) X conj(H(i)) + N(i)
H(i) = channel estimate of ith subcarrier
N(i) = noise estimate of ith subcarrier
After obtaining the softbits thru QAM demodulation, these softbits from every subcarrier are multiplied by their corresponding CSI.
I am not able to understand why there is a need for such multiplication. Neither I could find any reference.
Regards

回答(1 个)

sumit kumar
sumit kumar 2018-1-7
Well I found this reference where it says that soft Viterbi could be used with additional channel state information.
I guess that's why the softbits are multiplied by respective CSI before feeding them to deinterleaver!

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