pngen.m

这个是beyong 3G的一个系统仿真程序,它是MC和CDMA的一个结合系统,采用了扩张码的选择.

function pn_code = pngen(sqLength, noCodes)
%   !!! IMPORTANT this function works together with pnsequence.m function
%Generate Pseudo-Noise(PN) sequence using pnsequence.m function
%           (Linear Feedback Shift Registers)
% 
%   PN = PNSEQUENCE(sqLength,noCodes)
% 
%   sqLength: Length of PN sequence
%   noCodes: Number of PN sequences required
%
%   Anvar Narzullaev
%   Mobile Communication Lab 
%   Information and Communication Engineering Department
%   Yeungnam University, Korea
poly = primpoly(log2(sqLength+1),'all');
[nn,ll] = size(poly);
if nn < noCodes 
    nn
    error('noCodes should be lower or equal to nn');
end
poly = ((dec2bin(poly)*2-97)+1)/2;
for n = 1:noCodes
    pn_code(n,:) = pnsequence(poly(n,:),ones(1,log2(sqLength+1)),sqLength);
end