Matlab Code for CDMA

[Aya2002]

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

 

[salma adel]

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

 

[Aya2002]

in fact i am working on MC - CDMA

 

[salma adel]

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??

 

[Aya2002]

sorry for the late response,

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

 

[bigdogguru]

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

 

[salma adel]

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