half of the progarm showing error

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shailaja
shailaja 2013-4-13
clc clear
% Generation of bit pattern s=round(rand(1,25)); signal=[]; carrier=[]; t=[0:2*pi/119:2*pi] for k=1:25 if s(1,k)==0 sig=-ones(1,120); else sig=ones(1,120); end c=cos(t); carrier=[carrier c]; signal=[signal sig]; end subplot(4,1,1); plot(signal); axis([-100 3100 -1.5 1.5]); title('\bf\it Original Bit Sequence');
bpsk_sig=signal.*carrier; subplot(4,1,2); plot(bpsk_sig) axis([-100 3100 -1.5 1.5]); title('\bf\it BPSK Modulated Signal');
t1=[0:2*pi/9:2*pi]; t2=[0:2*pi/19:2*pi]; t3=[0:2*pi/29:2*pi]; t4=[0:2*pi/39:2*pi]; t5=[0:2*pi/59:2*pi]; t6=[0:2*pi/119:2*pi]; c1=cos(t1); c1=[c1 cc1c1c1c1c1c1c1c1 c1]; c2=cos(t2); c2=[c2 c2c2c2c2 c2]; c3=cos(t3); c3=[c3 c3c3 c3]; c4=cos(t4); c4=[c4 c4 c4]; c5=cos(t5); c5=[c5 c5]; c6=cos(t6);
spread_signal=[]; for n=1:25 c=randint(1,1,[1 6]); switch(c) case(1) spread_signal=[spread_signal c1]; case(2) spread_signal=[spread_signal c2]; case(3) spread_signal=[spread_signal c3]; case(4) spread_signal=[spread_signal c4]; case(5) spread_signal=[spread_signal c5]; case(6) spread_signal=[spread_signal c6]; end end subplot(4,1,3) plot([1:3000],spread_signal); axis([-100 3100 -1.5 1.5]); title('\bf\it Spread Signal with 6 frequencies');
freq_hopped_sig=bpsk_sig.*spread_signal; axis([-100 3100 -1.5 1.5]); title('\bf\it Frequency Hopped Spread Spectrum Signal');
figure,subplot(2,1,1) plot([1:3000],freq_hopped_sig); axis([-100 3100 -1.5 1.5]); subplot(2,1,2); plot([1:3000],abs(fft(freq_hopped_sig)));
  2 个评论
shailaja
shailaja 2013-4-13
thanku sir...only one output is not showing otherwise its worthy..
Iman Ansari
Iman Ansari 2013-4-13
You didn't specify any graph for subplot(4,1,4)

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Iman Ansari
Iman Ansari 2013-4-13
编辑：Iman Ansari 2013-4-13
Hi. you need to correct these lines:
c1=[c1 cc1c1c1c1c1c1c1c1 c1];
c2=cos(t2);
c2=[c2 c2c2c2c2 c2];
I edited it:
clc
clear
% Generation of bit pattern
s=round(rand(1,25));
signal=[];
carrier=[];
t=[0:2*pi/119:2*pi]
for k=1:25
if s(1,k)==0
sig=-ones(1,120);
else
sig=ones(1,120);
end
c=cos(t);
carrier=[carrier c];
signal=[signal sig];
end
subplot(4,1,1);
plot(signal);
axis([-100 3100 -1.5 1.5]);
title('\bf\it Original Bit Sequence');
bpsk_sig=signal.*carrier;
subplot(4,1,2);
plot(bpsk_sig)
axis([-100 3100 -1.5 1.5]);
title('\bf\it BPSK Modulated Signal');
t1=[0:2*pi/9:2*pi];
t2=[0:2*pi/19:2*pi];
t3=[0:2*pi/29:2*pi];
t4=[0:2*pi/39:2*pi];
t5=[0:2*pi/59:2*pi];
t6=[0:2*pi/119:2*pi];
c1=cos(t1);
c1=[c1 c1 c1 c1 c1 c1 c1 c1 c1 c1 c1 c1];
c2=cos(t2);
c2=[c2 c2 c2 c2 c2 c2];
c3=cos(t3);
c3=[c3 c3 c3 c3];
c4=cos(t4);
c4=[c4 c4 c4];
c5=cos(t5);
c5=[c5 c5];
c6=cos(t6);
spread_signal=[];
for n=1:25
c=randint(1,1,[1 6]);
switch(c)
case(1)
spread_signal=[spread_signal c1];
case(2)
spread_signal=[spread_signal c2];
case(3)
spread_signal=[spread_signal c3];
case(4)
spread_signal=[spread_signal c4];
case(5)
spread_signal=[spread_signal c5];
case(6)
spread_signal=[spread_signal c6];
end
end
subplot(4,1,3)
plot([1:3000],spread_signal);
axis([-100 3100 -1.5 1.5]);
title('\bf\it Spread Signal with 6 frequencies');
freq_hopped_sig=bpsk_sig.*spread_signal;
axis([-100 3100 -1.5 1.5]);
title('\bf\it Frequency Hopped Spread Spectrum Signal');
figure;
subplot(2,1,1)
plot([1:3000],freq_hopped_sig);
axis([-100 3100 -1.5 1.5]);
subplot(2,1,2);
plot([1:3000],abs(fft(freq_hopped_sig)));

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