802.11g Demodulation in WLAN Toolbox MATLAB 2017b

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

Answer 1

[sumit kumar]

Well I found this reference where it says that soft Viterbi could be used with additional channel state information.

http://ieeexplore.ieee.org/document/793537/

I guess that's why the softbits are multiplied by respective CSI before feeding them to deinterleaver!