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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