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how to add cyclic prefix..I want codings to add it

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Janet
Janet 2012-2-27
评论： Dipsikha Roy 2021-2-3
Cyclic prefix=15
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Janet
Janet 2012-2-27
i gave qpsk signal as input and then took ifft..now i should add cp of length 15
%Generate random data
len=128;
m=4;
msg1=randint(len,1,m);
msg2=randint(len,1,m);
% figure(1)
% stem(msg1);
% stem(msg2);
% grid on;
% xlabel('data points')
% ylabel('transmitted data phase representation')
% title('Transmitted Data "O"')
% QPSK modulation
qpsk_modulated_data1=pskmod(msg1,m);
qpsk_modulated_data2=pskmod(msg2,m);
% scatterplot(qpsk_modulated_data1);
% title('qpsk modulated transmitted data1');
% scatterplot(qpsk_modulated_data2);
% title('qpsk modulated transmitted data2');
%IFFT
x1=ifft(qpsk_modulated_data1);
x2=ifft(qpsk_modulated_data2);

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