rayleigh_zibian.m

考虑载波的qpsk信号在瑞利信道上的仿真

% 自编一个多径瑞利衰落的信道,以前的很多程序在处理多径延迟的时候
% 就是直接将基带码元延迟一定的时间，这种处理方法是相当粗糙的，
% 这种不考虑实际载波的延迟是没有意义的，与实际情况不符
% 一个基带符号的持续时间和它被调制后的持续时间应该是一样的
% 在编写程序的时候一定要注意这一点；

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% 关于参数的单位的情况：
% x-------是已调制好的信号；
% fc---载波频率，fs-----采样频率；单位都是Hz
% symbol_t表示的是一个调制符号的持续时间
% number_path是多径条数；
% time_delay 是时间延迟矢量，单位是秒，行矢量；
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function Rayleigh_ZiBian(x,fc,fs,symbol_t,number_path,time_delay)

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% 首先进行错误检测；
if nargin<6
    error('the input arguments are not complete!');
elseif size(time_delay,1)>size(time_delay,2)
    error('the input time_delay should be a row vector!');
elseif size(time_delay,2)<number_path
    error('the nmber of paths is not identical!');
end;
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% 注意信号的发送方向：------------------x(i+1)--x(i)---->

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