jakesmodel.m

可用于3G/B3G系统当中的快衰信道的jakes模型的matlab仿真 作者已经将它用于ofdm系统

function RayleighFade = JakesModel(v, fc, Tstart, Ts, Ns, N0, AvgFadePower)
% Construct the MIMO channel by Jake Model.
% the number of input and output of the MIMO channel is given in the Tstart matrix, in which the number of row is for the 
% receive antennas, and the column for transmit antennas.
% v: velocity of the mobile station(km/h)
% fc: carrier frequency(Hz)
% Tstart: start time matrix(s)
% Ts: sample interval(s)
% Ns: sample number
% N0: number of sin generators
% AvgFadePower: fading power
Nr=size(Tstart,1);      %接收天线个数
Nt=size(Tstart,2);      %发送天线个数
lamda = 3e+08/fc;       %lamda波长=波速/载频
fmax = v*1000/(3600*lamda);  %最大多普勒频移fmax=v/lamda  (v:m/s;lamda:m;)
t=Tstart+Ts*Ns;  %取样点
sigma=sqrt(AvgFadePower/2);%由于功率的衰减，导致了包络大小的改变
N=4*N0+2;%NO为正弦发生器个数
n=1:N0; %n取正弦个数的其中之一
fi=fmax*[cos(2*pi*n/N) 1];%生成一个行向量，当n>=1&n<=NO时，fi=fmax*cos(2*pi*n/N);当n=NO+1时,fi=fmax
cc=[2*cos(pi*n/N0) 1];
cs=[2*sin(pi*n/N0) 1];
for ii=1:Nr
    for jj=1:Nt
        RayleighFade(ii,jj)=2*sigma/sqrt(N)*(cos(2*pi*fi*t(ii,jj))*(cc+j*cs)');
    end
end