simualting the spreading using Walsh Codes

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Anne
Anne 2012-5-5
A = [-1 -1 1 1]; B = [-1 1 -1 1]; C = [1 1 -1 -1];
% Generating the code and its timing sequence:
N = 4; H = hadamard(N);
cA = H(2,:); cB = H(3,:); cC = H(4,:);
% Number of samples per chip: Tc_samp = ones(1,4);
codeA = []; codeB = []; codeC = [];
for k = 1 : length(cA)
codeA = [codeA cA(k)*Tc_samp];
codeB = [codeB cB(k)*Tc_samp];
codeC = [codeC cC(k)*Tc_samp];
end
% Generation of Tx Data:
Tx_data = [];
for k = 1 : length(A)
uA = A(k)*codeA;
uB = B(k)*codeB;
uC = C(k)*codeC;
Tx_data = [Tx_data uA+uB+uC];
end
NN = length(Tx_data)
uAb = []; uBb = []; uCb = [];
for k = 1 : NN / 16
index = (k - 1)*NN/4 + 1 : k*NN/4;
uAb = [uAb sum(Tx_data(index).*codeA)];
uBb = [uBb sum(Tx_data(index).*codeB)];
uCb = [uCb sum(Tx_data(index).*codeC)];
end uAb % Error:
res1 = A-uAb/16;
res2 = B-uBb/16;
res3 = C-uCb/16;
i am unable to understand this code , help me in understanding every statement of this code.

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