The document describes the components of a CDMA transmitter and receiver. It shows how a data sequence is spread using a gold code by performing an XOR operation between the bits of data and gold code. The spread signal is transmitted and at the receiver, the original data sequence is recovered by performing another XOR operation between the received spread signal and the same gold code. Matlab code is provided to simulate this process of spreading the data at the transmitter and despreading it at the receiver.

1. TRANSMITTER SIDE COMPONENTS (SAMPLE ASSIGNMENT)
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CDMA transmitter and receiver
This sapmle assignment shows CDMA link transmitter and receiver using DS-CDMA xor
logic spreading......
BASIC_CDMA.m
clc;
spread=[];
Data=((randint(1,8))>.5)+0;
Goldcode=((randint(1,15))>.5)+0;
k=1;
LD=length(Data);
LG=length(Goldcode);
for i=1:LD
for j=1:LG
spread(1,k)=xor(Data(1,i),Goldcode(1,j));
k=k+1;
end
end
spread
%.......bit time............
figure
Tb=10;
Data_pulse = rectpulse(Data(1,:),10);
subplot(3,1,1);
stem(Data_pulse);
ylabel('bf Original Bit Sequence');
title('bfit TRANSMITTED MESSAGE');
Gold_pulse = rectpulse(Goldcode(1,:),10);
subplot(3,1,2);
stem(Gold_pulse);
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2. ylabel('bf Gold Code');
%.........................
spreaded_pulse = rectpulse(spread(1,:),10);
subplot(3,1,3);
stem(spreaded_pulse);
ylabel('bf Spreaded Sequence')
%-------Demodulation to get original message signal---------
i=1;
k=1;
los= length(spread);
while k < los
s=0;
for j=1:15
temp(1,j) = xor(spread(1,k),Goldcode(1,j));
k=k+1;
s=s+temp(1,j);
end
if(s==0)
b2(1,i) = 0;
else
b2(1,i) = 1;
end
i=i+1;
end
despreaded_signal = b2;
%-----Plotting Despreaded signal------
figure
pattern=[];
for k=1:8
if b2(1,k)==0
sig=zeros(1,10);
else
sig=ones(1,10);
end
pattern=[pattern sig]

3. end
subplot(3,1,1);
stem(spreaded_pulse);
ylabel('bf Spreaded Sequence');
title('bfit Received MESSAGE');
Gold_pulse = rectpulse(Goldcode(1,:),10);
subplot(3,1,2);
stem(Gold_pulse);
ylabel('bf Gold Code');
subplot(3,1,3);
stem(pattern);
ylabel('bf Despreaded Sequence')
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