Matlab Code for CDMA

I saw, nobody wants to contribute to this group, so that i decided to start it myself,

the following is a matlab code for DS - CDMA. I am waiting for any comments of this group members.

%% Reduced PAPR in CDMA using new Technique.
%% DS-CDMA Simulation by Montadar Abas

clear all;
close all;
clc;

%% Deciding the Number of users and the Number of bits for each user (same
%% for all users)
x= input ('Number of users =');
y=input('Number of Bits for each user = ');
r=log(x)/log(2)
%% Generating the Walsh Code
xx=hadamard(x);
wmmsnn=xx,;

u=[];
m=[];
for t = 1 : x

u=[u; (randint(1,y,2)*2-1)];
m=[m ; (kron(u(t,,wmmsnn(t,))];
end
%% combining all the messages together and normalize it.
mms=sum(m)/x;
y2 =rectpulse(mms,r);
%% Pass through AWGN channel
snrloop=-5:1:35;
numsnr=length(snrloop);
bervec=[];
for n=1:numsnr

mmsn2=awgn(y2,snrloop,'measured');
%% Integrate and dump (downsampling)

mmsn=intdump(mmsn2,r);
%mmsn=dp_nrz_L(mmsn7);
%% Decode the recieved noisy signal to reproduce the original messages.

g=ones(1,y);
outmsg=[];
for rb=1:x
g1=kron(g,wmmsnn(rb,);
r1= g1.*mmsn;
rr1=reshape(r1,x,length(r1)/x);
k1=sum(rr1);
u11=k1>0;
outmsg=[outmsg;u11];
end

thank you for the code but i want to ask you if you are working on IDMA ??if yes i need your advice please.

in fact i am working on MC - CDMA

well maybe we can be friends i am working on mc-ds-cdma but thinking if idma gives better performance or not?? what do you think Aya??

sorry for the late response,

the interleaved division multiple access may has better performance, but with respect to what?

I found this interesting write up on OFDM/CDMA algorithms in the Wireless Cell Networks by Eric Lawrey:

Third Generation Wireless Networks

Along with Matlab Code for OFDM Transceiver and OFDM and CDMA Simulation:

OFDM/CDMA Matlab Code

Audio Demo of Various Algorithms

i want to ask about this program: where is the modulation??
i want to know also if there is any problem if i put the modulation before generating the coding with PN generator??
thank you