jakeschannel.m

车载移动信道的仿真常用模型 模拟车载移动信道产生的瑞利衰落 默认为6径衰落 移动速度可以设定

function I1=jakeschannel(power,fs,fc,speed,blocklength);
% power  -----------  无线信道增益的方差
% fc     -----------  信号的调制载频
% v      -----------  车载的运动速率
% tao    -----------  信道时间相关性的特征参数

power=power;                    
fs=fs;                        % Hz, system sample frequency
fc=fc;                       % Hz, carrier frequency
speed=speed;                        % km/h, vehicle speed 
blocklength=blocklength;
fm=fc*speed*1e3/3600/3e8;       % Hz,maximun Doppler Frequency
tao=1/fs;

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  begin   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
for i=1:1:10000-1
    a(i)=sqrt(power/2/sqrt(fm^2-(-fm+i*2*fm/10000)^2)/pi*2*fm/10000)*randn(1);
    b(i)=sqrt(power/2/sqrt(fm^2-(-fm+i*2*fm/10000)^2)/pi*2*fm/10000)*randn(1);
    c(i)=sqrt(a(i)^2+b(i)^2);
    fai(i)=0+(2*pi-0)*rand(1);
end
for i=1:1:blocklength
    i
    I1(i)=0;
    for j=1:1:10000-1
        I1(i)=I1(i)+c(j)*cos(2*pi*(-fm+j*2*fm/10000)*i*tao+fai(j))+sqrt(-1)*c(j)*sin(2*pi*(-fm+j*2*fm/10000)*i*tao+fai(j));
    end
end