CDMA.zip_cdma_cdma matlab_zip

% main nae comments add kar diae hain. Agar phir bhi samaj na ae to % directly command window main code run kar ke check kar laina. agar phir % bhi samaj na ae to muje call kar laina %first of all we will generate a rondom code %then we create its gold sequence %then in the end we will make its speread spectrum % then after reciving thet signal %first we will recive its speread spectrum %then we create its gold sequence %in the end we will get that rondom code again clc; close all; clear all; b=round(rand(1,20)); %generates rand no 1 or zero pattern=[]; % array declare ki hai for k=1:20 % loop which starts from 1 and end at 20 if (b(1,k)==0) %if b(x,x) is equal to zero, assign sig zero %sig is integer sig=zeros(1,6); % add 6 zeros instead of one else sig=ones(1,6); %if b(x,x) is equal to one, assign sig one %sig is integer end pattern=[pattern sig]; %concatination (means join karna) end b1=b; message=b1; message1=pattern; subplot(3,2,1); plot(pattern) axis([-1 120 -.5 1.5]); %x-axis -1 to 120 and y-axis -.5 to 1.5 ylabel('\bf Code Sequence') title('\bf Transmited') %-------------------------- %gold code Goldcode=((randint(1,20))>.5)+0; %specific code apply kia hai code par % jis ke pass ye code ho ga sirf wohi is % code ko dobara recover kar sake ga GC=[]; for k=1:20 if (Goldcode(1,k)==0) s=zeros(1,6); % add 6 zeros instead of one (ta ke plot clear ho jae) else s=ones(1,6); % add 6 zeros instead of one end GC=[GC s]; %concatination end subplot(3,2,3); plot(GC); axis([-1 120 -.5 1.5]); %x-axis -1 to 120 and y-axis -.5 to 1.5 ylabel('\bf GOLD Sequence') % Spreading the pattern with the gold code k=1; for i=1:20 for j=1:20 spread(1,k)=xor(b1(1,i),Goldcode(1,j)); %ye modulation ke taran hai k=k+1; end end spread; subplot(3,2,5); plot(spread); axis([-1 400 -.5 1.5]); ylabel('\bf Spreaded Sequence') %-----------Recived--------upper wala spread spectrum humain recive ho gya %hai.....jo kaam upper kia hai us ka inverse is se niche kia hai i=1; k=1; los= length(spread); while k < los s=0; for j=1:20 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; %demodulade signal pattern=[]; for k=1:20 if b2(1,k)==0 sig=zeros(1,6); else sig=ones(1,6); end pattern=[pattern sig]; end subplot(3,2,2); plot(spread); axis([-1 400 -.5 1.5]); ylabel('\bf Spreaded Sequence') title('\bf Recived') subplot(3,2,4); plot(GC); axis([-1 120 -.5 1.5]); %x-axis -1 to 120 and y-axis -.5 to 1.5 ylabel('\bf GOLD Sequence') subplot(3,2,6); plot(pattern) axis([-1 120 -.5 1.5]); %x-axis -1 to 120 and y-axis -.5 to 1.5 ylabel('\bf Code Sequence')