关于MATLAB源代码：

function [G,T,NF,Arake,Srake,Prake] = ...
   cp0803_rakeselector(hf,fc,ts,L,S)

% -----------------------------
% Step One - Channel Estimation
% -----------------------------

dt = 1 / 50e9;

ahf = abs(zeros(1,5));
[s_val,s_ind] = sort(ahf);

NF = 0;
i = length(s_ind);
j = 0;
% evaluation of the reference vectors
% for the RAKE combiner
while (s_val(i)>0)&(i>0)
    NF = NF + 1;
    j = j + 1;
    index = s_ind(i);
    I(j) = index;
    T(j) = (index-1)*dt;
    G(j) = hf(index);
    i = i - 1;
end

% --------------------------------------------
% Step Two - Evaluation of the weighting terms
% --------------------------------------------

binsamples = floor(2e-9/dt);
if 5 > NF
    S = NF;
end
if 5 > NF
    L = NF;
end

Arake = zeros(1,NF*binsamples);
Srake = zeros(1,NF*binsamples);
Prake = zeros(1,NF*binsamples);

% Selective Rake and All Rake

for nf = 1 : NF
    
    x = I(nf);
    y = G(nf);
    Arake(x) = y;
    if nf <= S
        Srake(x) = y;
    end
        
end % for nf = 1 : NF

% PRake


[tv,ti] = sort(T);
TV = tv(1:L);
TI = ti(1:L);
tc = 0;
for nl = 1 : length(TV)
    index = TI(nl);
    x = I(index);
    y = G(index);
    Prake(x) = y;
    tc = tc + 1;
    L = L - 1;
end

运行显示：??? Undefined function or variable "T".

Error in ==> cp0803_rakeselector at 101
[tv,ti] = sort(T);
望高手解答，谢谢

追问：这个是超宽带无线电基础这本书上的

答案：估计是这个循环没有执行, 你设一下断点, 看看T到底呗赋值了没有, 如果没有, 就会出现上述情况.
while (s_val(i)>0)&(i>0)
    NF = NF + 1;
    j = j + 1;
    index = s_ind(i);
    I(j) = index;
    T(j) = (index-1)*dt;
    G(j) = hf(index);
    i = i - 1;
end

其他：你这个是普罗克斯或者译为普罗金斯的现代通信系统使用matlab一书上的吧。这个是多幅度信号仿真。使用的的是蒙特卡罗仿真方法，就是用很多次实验的到的结果仿真 

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