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RxOnce.m
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RxOnce.m
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function ber=RxOnce(rxWaveFormWith,txDmrs,txData,CHE,EQ)
global puschDMRS;
sysCfg=sysCfgStr();
subcarriers=sysCfg.subcarriers;
ts=sysCfg.ts;
fd=0;
fftsize=sysCfg.fftsize;
maxPathNum=sysCfg.maxPathNum;
% if strcmp(chan,'awgn')
% %txWaveFormWithCh=a;
% txWaveFormWithCh=awgn(a,SNR);%,'measured');
% elseif strcmp(chan,'rayleigh') % and +awgn
% %txWaveFormWithCh=awgn(a,SNR);%,'measured');
% %txWaveFormWithCh=a;
% %c1 = rayleighchan(1e-5,130) % Create object.
% %c1.PathDelays = [0 1e-6] % Change the number of delays.
% tau=[0 12*ts];% 5*ts];
% chan=rayleighchan(ts,fd,tau);
% %c1.PathDelays = [0 1e-6]
% %chan.PathDelays=[ 0 4*ts];
% txWaveFormWithCh=filter(chan,a);%txWaveFormWithCh);%¹ýÐŵÀ
% end
%txWaveFormWithCh=ifft(txWaveFormWithCh); % T2F
%txWaveFormWithCh=txWaveForm;
%% Rx processing
%% Data Extract
%Atc
TimeOffset=0;
a=reshape(rxWaveFormWith,length(rxWaveFormWith),1);
rxData=[];
for i=1:7
if(i==1)
rxData=[rxData,a(sysCfg.firstCp+1+TimeOffset:sysCfg.firstCp+sysCfg.fftsize+TimeOffset)];
a=a(sysCfg.fftsize+sysCfg.firstCp+1:end);
elseif(i==4)
rxDmrs=a(sysCfg.normalCp+1+TimeOffset:sysCfg.normalCp+sysCfg.fftsize+TimeOffset);
a=a(sysCfg.fftsize+sysCfg.normalCp+1:end);
else
rxData=[rxData,a(sysCfg.normalCp+1+TimeOffset:sysCfg.normalCp+sysCfg.fftsize+TimeOffset)];
a=a(sysCfg.fftsize+sysCfg.normalCp+1:end);
end
end
%% T2F
rxDataFd=[];
rxDmrsFd=fft(rxDmrs,sysCfg.fftsize);
%rxDmrsFd=rxDmrsFd(1:sysCfg.subcarriers);% need demapping!!!
for i=1:6
%a=rxData(:,i);%fft(rxData(:,i),sysCfg.fftsize);
a=fft(rxData(:,i),sysCfg.fftsize);
%a=a(1:sysCfg.subcarriers);% need demapping!!!
rxDataFd=[rxDataFd,a];
%scatterplot(a)
end
%% SubCarrier->Data DeMapping[Shift]
rxDmrsSym=FreqMapSub(rxDmrsFd,subcarriers);
%rxDmrsSym=[rxDmrsFd(end-(subcarriers/2)+1:end);rxDmrsFd(2:subcarriers/2+1)];
for i=1:6
rxDataSym(:,i)=FreqMapSub(rxDataFd(:,i),subcarriers);
%rxDataSym(:,i)=[rxDataFd(end-(subcarriers/2)+1:end,i);rxDataFd(2:subcarriers/2+1,i)];
end
%scatterplot(rxDataSym(:,1));
%% %%%%%%%%%%%%%channel estimation
%% %%%%%%%%%%%%%CHE LS mothod
if strcmp(CHE,'LS1')%CHE=='LS'
%txDmrsFd=ifft(txDmrs,sysCfg.fftsize);
%rxDmrsp=fft(rxDmrs,sysCfg.fftsize);
%Hls=rxDmrsFd./txDmrsFd;
%Hd=conj(txDmrs).*rxDmrsFd;
Hls=rxDmrsSym./txDmrs;
%% time field select
a=subMapFreq(Hls,subcarriers,fftsize);
h_td=ifft(a);
%b(32:end)=0;
h_td(48+1:end-48)=0;
%b(sysCfg.firstCp+1:end)=0;
%b(abs(b)<max(abs(b))/10)=0;
c=fft(h_td);
Hd=FreqMapSub(c,subcarriers);
Hd0=Hd;
Hd_abs=abs(Hd).^2;
Hd=conj(Hd)./Hd_abs;
%ht=ifft(Hls,sysCfg.subcarriers);
%ht(16:end)=0;
%ht(abs(ht)<max(abs(ht))/20)=0;
%Hd=fft(ht,sysCfg.subcarriers);
%Hls=Hd;
%%
%pw=abs(Hls);
%Hd=Hls./pw;
elseif strcmp(CHE,'LS0')%CHE=='LS'
%txDmrsFd=ifft(txDmrs,sysCfg.fftsize);
%rxDmrsp=fft(rxDmrs,sysCfg.fftsize);
%Hls=rxDmrsFd./txDmrsFd;
%Hd=conj(txDmrs).*rxDmrsFd;
%Hls=conj(txDmrs).*rxDmrsSym;
Hls=rxDmrsSym./txDmrs;
%% time field select
% a=subMapFreq(Hls,subcarriers,fftsize);
% b=ifft(a);
% %b(32:end)=0;
% windth=sysCfg.firstCp;
% b(windth+1:end-windth)=0;
% %b(abs(b)<max(abs(b))/10)=0;
% c=fft(b);
% Hd=FreqMapSub(c,subcarriers);
Hd0=Hls;
Hd_abs=abs(Hls).^2;
Hd=conj(Hls)./Hd_abs;
%Hd=(Hd)./Hd_abs;
%ht=ifft(Hls,sysCfg.subcarriers);
%ht(16:end)=0;
%ht(abs(ht)<max(abs(ht))/20)=0;
%Hd=fft(ht,sysCfg.subcarriers);
%Hls=Hd;
%%
%pw=abs(Hls);
%Hd=Hls./pw;
elseif strcmp(CHE,'LMMSE')%CHE=='LS'
%txDmrsFd=ifft(txDmrs,sysCfg.fftsize);
%rxDmrsp=fft(rxDmrs,sysCfg.fftsize);
%Hls=rxDmrsFd./txDmrsFd;
%Hd=conj(txDmrs).*rxDmrsFd;
%Hls=conj(txDmrs).*rxDmrsSym;
%Hmmse=CE_lmmse(Yrs,Nrb,RS,Lengthdelay,ppsMaxPathnum,Nfft)
Hls=rxDmrsSym./txDmrs;
%% time field select
a=subMapFreq(Hls,subcarriers,fftsize);
h_td=ifft(a);
%b(32:end)=0;
h_td(48+1:end-48)=0;
%b(sysCfg.firstCp+1:end)=0;
%b(abs(b)<max(abs(b))/10)=0;
c=fft(h_td);
Hd=FreqMapSub(c,subcarriers);
Hd_abs=abs(Hd).^2;
Hd1=conj(Hd)./Hd_abs;
%figure;plot(real(Hd1),'b--');hold on;
Hd0=CE_lmmse(rxDmrsSym,sysCfg.Nrb,txDmrs,sysCfg.maxGroupDelay,sysCfg.maxPathNum,sysCfg.fftsize);
%Hd=conj(Hd)/sqrt(2);
Hd_abs=abs(Hd0).^2;
%Hd_abs=Hd_abs*6;
%Hd=Hd./Hd_abs;%
Hd=conj(Hd0)./Hd_abs;% result is same..?? +conj is right
% figure;plot(real(Hd1),'b--');hold on;
% plot(real(Hd),'r--');
% figure;plot(imag(Hd1),'b--');hold on;
% plot(imag(Hd),'r--');
elseif strcmp(CHE,'LMMSExx')
Hlsx=conj(txDmrs).*rxDmrs
else
Hd=ones(sysCfg.subcarriers,1);
end
%% noise EST
noise=txDmrs-Hd.*rxDmrsSym;
snr=sum(abs(txDmrs).^2)/sum(abs(noise).^2);
snrdB=10*log10(snr);
%SNR = 10^(SNRdB/10);
%new_w = conj(h_est) ./ ( abs(Hd).^2 + 1/SNR);
%new_w = Hd ./ ( abs(Hd).^2 + 1/SNR);
%new_w = Hd ./ ( abs(Hd).^2 + 1/snr);
Hd_abs=abs(Hd0).^2;
new_w=conj(Hd0)./(Hd_abs+ 1/snr);% result is same..?? +conj is right
%output_symbols = output_noisy_symbols .* new_w;
%% %%%%%%%%%%%%%EQ
rxDataTd = [];
if strcmp(EQ,'ZF')
%% %%%%%%%%%%%%%ZF
for i=1:6
aFd = Hd.*rxDataSym(:,i);
%aFd = conj(Hd).*rxDataSym(:,i);
aTd=aFd;%fft(aFd,sysCfg.subcarriers);
rxDataTd = [rxDataTd,aTd];
end
elseif strcmp(EQ,'LMMSE')
%% %%%%%%%%%%%%%ZF
for i=1:6
aFd = rxDataSym(:,i).*new_w;
%aFd = conj(Hd).*rxDataSym(:,i);
aTd=aFd;%fft(aFd,sysCfg.subcarriers);
rxDataTd = [rxDataTd,aTd];
end
else
%% %%%%%%%%%%%%%draw raw RxData
for i=1:6
aFd = Hd.*rxDataSym(:,i);
aTd=aFd;%fft(aFd,sysCfg.subcarriers);
rxDataTd = [rxDataTd,aTd];
%scatterplot(aFd)
end
end
%scatterplot(rxDataTd(:,1));
%subplot(2,1,1);
%scatter(real(rxDataTd(:,1)),imag(rxDataTd(:,1)));
% a=Hd1.*rxDataSym(:,1);
% scatter(real(a(:,1)),imag(a(:,1)));hold on;
% scatter(real(rxDataTd(:,1)),imag(rxDataTd(:,1)));
% close all;
%% demod
a=[];
for i=1:2^sysCfg.modbits
a=[a;uint8(dec2binvec(i-1,sysCfg.modbits)')];
end
modTbl=lteSymbolModulate(a, sysCfg.modm);
rxData=[];
for i=1:size(rxDataTd,2)
for j=1:size(rxDataTd,1)
[x,y]=min(rxDataTd(j,i)-modTbl);
rxData(j,i)=modTbl(y);
if rxData(j,i)==0
rxData(j,i)=rxData(j,i);
end
end
end
%rxDataTd = [];
a=sum(sum(abs(txData-rxData)~=0));
ber=a/(size(rxData,1)*size(rxData,2));
%subplot(2,1,2);scatter(real(rxDataTd(:,1)),imag(rxDataTd(:,1)));
end