I'm wondering how to use the Maximum Ratio Combining with MIMO-DS-CDMA, I have used the MIMO with DS-CDMA using Walsh code, then at receiver I couldn't recover the transmit signal using the MRC. here what what I did:
x = [0.7+0.7i; 0.7-0.7i; 0.7i+0.7i; -0.7+0.7i]; %generate signal x size 4x1 h = (randn(4,4) + 1j.*randn(4,4))/sqrt(2); %Generate 4x4 channel code = hadamard(4) %generate walsh code x_s = kron(x,cod(:,1)) %spread the signal x with one walsh code r = reshape(h*reshape(x_s,4,),,1); % the received signal with AWGN
suppose I have perfect knowledge channel at receiver side, it means
h is known. how can I use MRC for
r in order to recover the transmitted signal? Is that possible?