% 自編一個多徑瑞利衰落的信道,以前的很多程序在處理多徑延遲的時候
% 就是直接將基帶碼元延遲一定的時間，這種處理方法是相當粗糙的，
% 這種不考慮實際載波的延遲是沒有意義的，與實際情況不符
% 一個基帶符號的持續時間和它被調制后的持續時間應該是一樣的
% 在編寫程序的時候一定要注意這一點；

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% 關于參數的單位的情況：
% x-------是已調制好的信號；
% fc---載波頻率，fs-----采樣頻率；單位都是Hz
% symbol_t表示的是一個調制符號的持續時間
% number_path是多徑條數；
% time_delay 是時間延遲矢量，單位是秒，行矢量；
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function Rayleigh_ZiBian(x,fc,fs,symbol_t,number_path,time_delay)

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% 首先進行錯誤檢測；
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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% 注意信號的發送方向：------------------x(i+1)--x(i)---->

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