ljq_ppmreceiver.m

在单一天线接收和发送的UWB中Rake接收机BER的性能的仿真

%/*---------------------------接收积分检测---------------*/
function [RXbits]=ljq_PPMreceiver(R,mask,fc,numbit,Ns,Ts,HDSD)
[N,L]=size(R);
RXbits=zeros(N,numbit);
dt=1/fc;
framesamples=floor(Ts./dt);
bitsamples=framesamples*Ns;
for n=1:N
    rx=R(n,:);
    mx=rx.*mask
    if HDSD==1  %硬判决
        for nb=1:numbit
            mxk=mx(1+(nb-1)*bitsamples:bitsamples+(nb-1)*bitsamples);
            No0=0;
            No1=0;
            for np=1:Ns
                mxkp=mxk(1+(np-1)*framesamples:framesamples+(np-1)*framesamples);
                zp=sum(mxkp.*dt);
                if zp>0
                    No0=No0+1;
                else
                    No1=No1+1;
                end
            end
            if No0>No1
                RXbits(n,nb)=0;
            else
                RXbits(n,nb)=1;
            end
        end
    end
    if HDSD==2  %软判决
        for nb=1:numbit
            mxk=mx(1+(nb-1)*bitsamples:bitsamples+(nb-1)*bitsamples);
             zb=sum(mxk.*dt); 
             if zb>0
                 RXbits(n,nb)=0;
             else
                 RXbits(n,nb)=1;
             end
         end
     end
 end