adding files to test reciprocity beamforming
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4179 818b1a75-f10b-46b9-bf7c-635c3b92a50f
This commit is contained in:
Florian Kaltenberger
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function [F, HA]=alterproj(CHB2A,CHA2B, s, N, Nl, Nt)
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for l=1:Nl
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YA(:,((l-1)*Nt+1):(l*Nt))=squeeze(CHB2A{l}(s,:,:));
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YB(:,((l-1)*Nt+1):(l*Nt))=squeeze(CHA2B{l}(s,:,:));
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end
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HA=zeros(N,Nl);
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for l=1:Nl
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for t=1:Nt
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HA(:,l)=HA(:,l)+YA(:,t+(l-1)*Nt);
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end
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HA(:,l)=HA(:,l)/Nt;
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end
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GA=kron(HA,ones(1,Nt));
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F=YB*GA'*inv(GA*GA');
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oldobj=1e14;
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newobj=norm(YB-F*GA)^2+norm(YA-GA)^2;
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while(oldobj-newobj>1e-10)
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oldobj=newobj;
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FI=repmat([F; eye(N)],Nt,1);
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YBA=reshape([YB; YA],2*N*Nt,Nl);
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FIFI=FI'*FI;
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if(cond(FIFI)>30)
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warning(['The cond. number in HA est is ' num2str(cond(FIFI))])
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end
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HA=inv(FIFI)*FI'*YBA;
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GA=kron(HA,ones(1,Nt));
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GAGA=GA*GA';
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if(cond(GAGA)>30)
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warning(['The cond. number in F est. is ' num2str(cond(GAGA))])
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end
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F=YB*GA'*inv(GAGA);
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newobj=norm(YB-F*GA)^2+norm(YA-GA)^2;
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end
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end
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@@ -0,0 +1,122 @@
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initparams;
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N = 100; % N is number ofr time-measurements
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Nt = 3; % Nt is the number of antennas at node B
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N_loc = 3; %check
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CHA2B = {}; %this should be a cell array
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CHB2A = {}; %this should be a cell array
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% run measurements for all location
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for loc = 1:N_loc
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run_measwoduplex;
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% alternatively load the measurements from file for testing
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% now you should have chanestA2B, fchanestA2B, tchanestA2B, chanestB2A,
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% fchanestB2A, tchanestB2A
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CHA2B{loc} = chanestA2B; %to check
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CHA2B{loc} = chanestA2B; %to check
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disp('Please move the antenna to another location and press key when finished')
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pause
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end
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%% calculate full F matrix
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for s=1:301
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[F, HA]=alterproj(CHB2A,CHA2B, s, N, N_loc, Nt);
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Fs{s}=F;
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HAs{s}=HA;
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end
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%% plot F
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figure(1)
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clf
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hold on;
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for s=1:size(Fs,3);
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F=Fs(:,:,s);
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plot(diag(F),'bo')
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plot(diag(F,1),'r+')
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plot(diag(F,2),'gx')
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end
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%axis([-1 1 -1 1])
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hold off;
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% do some beamforming
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signalA2B=zeros(N,4);
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signalB2A=zeros(N,4);
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signalB2A_prec=zeros(N,4);
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%%----------Node A to B transmission---------%%
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for i=1:4
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if(indA(ia)==i)
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[Da2b_T, tmps]=genrandpskseq(N,M,amp);
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signalA2B(:,i)=tmps*2; %make sure LSB is 0 (switch=tx)
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else
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signalA2B(:,i)=repmat(1+1j,76800,1); %make sure LSB is 1 (switch=rx)
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end
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end
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oarf_send_frame(card,signalA2B,n_bit);
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%keyboard
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sleep(0.01);
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receivedA2B=oarf_get_frame(card);
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%oarf_stop(card); %not good, since it does a reset
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sleep(0.01);
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%% ------- Do the A to B channel estimation ------- %%
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for i=0:119;
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ifblock=receivedA2B(i*640+[1:640],indB);
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ifblock(1:128,:)=[];
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fblock=fft(ifblock);
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fblock(1,:)=[];
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fblock(151:360,:)=[];
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Da2b_R=vec(fblock);
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end
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chanestsA2B=reshape(diag(repmat(Da2b_T,Nantb)'*Da2b_R)/size(Da2b_T,1),301,Nantb);
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%fchanestsA2B(:,:,meas)=[zeros(1,Nantb); chanestsA2B([1:150],:,meas); zeros(210,Nantb); chanestsA2B(151:301,:,meas)];
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%tchanestsA2B(:,:,meas)=ifft(fchanestsA2B(:,:,meas));
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%% calculate beamformer based on chanestA2B
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for i=1:301
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YA=squeeze(chanestA2B(i,:,:));
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F=Fs(:,:,i);
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Bd(:,i) = conj(F*YA);
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end
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%% generate normal and beamformed signals
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[seqf, tmps]=genrandpskseq(N,M,amp);
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for i=1:size(seqf,1)
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% precoding
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for j=1:size(seqf,2)
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symbol_prec(:,j)=Bd(:,j)*seqf(i,j);
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end
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% insert zero subcarriers
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symbol_prec=cat(2,zeros(3,1),symbol_prec(:,1:150),zeros(3,210),symbol_prec(:,151:301));
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% ofdm modulation
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symbol_prec_t=ifft(symbol_prec,512,2);
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% Adding cycl. prefix making the block of 640 elements
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symbol_prec_cp = cat(2,symbol_prec_t(:,end-127:end), symbol_prec_t);
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tmps_prec(:,[1:640]+i*640)=floor(amp*symbol_prec_cp);
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end
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for i=1:4
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if(indB(ib)==i)
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signalB2A(:,i)=tmps*2; %make sure LSB is 0 (switch=tx)
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signalB2A_prec(:,i)=tmps_prec(i,:)*2; %make sure LSB is 0 (switch=tx)
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else
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signalB2A(:,i)=repmat(1+1j,76800,1); %make sure LSB is 1 (switch=rx)
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signalB2A_prec(:,i)=repmat(1+1j,76800,1); %make sure LSB is 1 (switch=rx)
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end
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end
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%% send normal signal
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oarf_send_frame(card,signalB2A,n_bit);
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%keyboard
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sleep(0.01);
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receivedB2A=oarf_get_frame(card);
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sleep(0.01);
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% measure SNR
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%% send beamformed DL signal
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oarf_send_frame(card,signalB2A_prec,n_bit);
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%keyboard
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sleep(0.01);
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receivedB2A=oarf_get_frame(card);
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sleep(0.01);
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% measure SNR
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