spread_frequency.m

[matlab]TD_SCDMA中的ZF_BLE和MMSE_BLE算法的链路仿真

%产生括频信号，SF为扩频因子

function [user_code_M,sf_signal]=Spread_Frequency(SF,Send_Signal);
s=Send_Signal;
n=size(s);            %收到的比特数
% 产生SF位OVSF扩频码
q=1; o_1=zeros(1,1); o_1=[1];
q=2; ovsf1=zeros(q,q); ovsf1=[o_1,o_1;o_1,-o_1];
nn=log2(SF);
ovsf=zeros(SF,SF);
for ii=1:nn-1, 
    ovsf=[ovsf1,ovsf1;ovsf1,-ovsf1];
    ovsf1=ovsf;
end



sf_signal=zeros(n(1),n(2)*SF);
user_code_M=zeros(n(1),SF);
for  x=1:n(1),                        %对每个用户扩频
    user_code=ovsf(x,:);
    user_code_M(x,:)=ovsf(x,:);
    ss=s(x,:);
   
    cc=zeros(1,SF*n(2));
    for ii=1:n(2),                     %把扩频码长扩展
        for jj=1:SF
            cc((ii-1)*SF+jj)=ss(ii);
        end
    end
    user_code1=zeros(1,SF*n(2));
    for ii=1:n(2),
        for jj=1:SF,
            user_code1((ii-1)*SF+jj)=user_code(jj);
        end 
    end
    sf_signal(x,:)=cc.*user_code1;    %用户数据和扩频码相乘
end