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Doubt with my codings..Pls help me correct it

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Janet
Janet 2012-3-6
clc;
clear all;
close all;
%input
M=1024;
nt=2;
nr=1;
L=65;
%Generate random data
m=4;
msg1=randint(M/2,1,m);
figure(1)
stem(msg1)
grid on
xlabel('data points')
ylabel('transmitted data phase representation')
title('Transmitted Data "O"')
msg2=randint(M/2,1,m);
figure(2)
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);
%scatterplot(x1)
%scatterplot(x2)
x=vertcat(x1,x2);
%Add CP
message = randint(1,M,4); %Assuming QPSK symbols
length_cyclic = 15;
starting =M - length_cyclic + 1;
cyclic_prefix = message(starting : end);
prefixed = horzcat(cyclic_prefix,message);
%channel
h1=gallery('circul',M:M);
h2=gallery('circul',M:M);
e=horzcat(h1,h2);
f=vertcat(h1,h2);
h=e*f;
There is no connection of adding CP with my output. How can I make it correct?
  7 个评论
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Jan
Jan 2012-3-6
What does "connects with the rest of the program" mean?
Janet
Janet 2012-3-6
@Jan: I am a beginner and I have a doubt whether adding CP has an effect on h ( channel response)

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回答（1 个）

Walter Roberson
Walter Roberson 2012-3-6
Your calculation of "h" does not involve any variables defined after your very early "%input" section. Therefore, adding CP has no effect on "h", at least not in the code you have written.

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