资 源 简 介
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%DS spread signal
DS=kron(data,ds);%length Ns*Nc
( kron: Kronecker product, element matrices of
kron(A,B) are A(i,j)B )
----------------------------------------------
%plot first 2 symbols of ds-modulated signal
if l==1 & k==1
plot([real(DS) imag(DS)]),title("2 symbols of DS
modulated signal"),
axis([0 2*Nc -1/sqrt(Nc) 1/sqrt(Nc)]),pause,
end
-------------------------------------------------
%CHANNELS
%This is the place to set SNR.
%Since symbol energy is 1 and noise variance is 1,
%SNR of symbol/noise sample is 0 dB.
%Thus, we have to multiply symbol or divide noise
to obtain desired SNR.
