mcds_cdma_comb_ideal.m

来自「一些关于调指和解调的小程序」· M 代码 · 共 26 行

function out=mcds_cdma_comb_ideal(input,ss_code,h,P)

%*******************************************************
%%% Orthogonality recover combining
%%% only combining, no demodulation
%%% the input is P*Lc matrix
%%% ss_code : spreading code, row vector
%%% h : channel transmission function(h=y./x),and is a 
%%%     P*Lc matrix in accordance with input
%*******************************************************

Lc=length(input);                %%% input is a row vector, spreading factor = P
K=Lc./P;
sig=reshape(input,P,[]);         %%% sig is a P*K matrix,each column is a spreaded symbol 
hh=reshape(h,P,[]);

for i=1:K
    G=1./hh(:,i);                  %%% ideal 
    G=G.';                         %%% row vector, 1*P
    comb(i)=(ss_code.*G)*sig(:,i)./P;    
end

out=comb;                        %%% combined signal sequence, 1*L vector 
                                 %%% demodulation then can be performed