Commit ca96118a authored by Florian Kaltenberger's avatar Florian Kaltenberger
Browse files

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4441 818b1a75-f10b-46b9-bf7c-635c3b92a50f
parent ca8d9017
% Author: Mirsad Cirkic, Florian Kaltenberger
% Organisation: Eurecom (and Linkoping University)
% E-mail: mirsad.cirkic@liu.se
if(paramsinitialized)
disp(['\n\n------------\nThis code is, so far, only written for single runs. Multiple ' ...
'runs will overwrite the previous measurement data, i.e., the ' ...
'data structures are not defined for multiple runs. You will need to ' ...
'add code in order to save the intermediate measurements and the ' ...
'corresponding timestamps.\n------------'])
N=76800;
M=4;
indA=find(active_rfA==1);
indB=find(active_rfB==1);
Nanta=length(indA);
Nantb=length(indB);
%if(Nanta~=1)
% error('Node A can only have one antenna active\n');
%end
Niter=1;
if(Niter~=1)
error('We should only use one get_frame at each run.\n');
end
Nmeas = 10;
%% ------- Prepare the signals for A2B ---------- %%
signalA2B=zeros(N,4);
signalB2A=zeros(N,4);
ia=1; ib=1;
Da2b_T=[];
Db2a_T=[];
for i=1:4
if(indA(ia)==i)
[tmpd, tmps]=genrandpskseq(N,M,amp);
signalA2B(:,i)=tmps*2; %make sure LSB is 0 (switch=tx)
signalB2A(:,i)=repmat(1+1j,76800,1); %make sure LSB is 1 (switch=rx)
Da2b_T = [Da2b_T tmpd];
if(length(indA)> ia) ia=ia+1; end
end
% if(indB(ib)==i)
% % This part could be improved by creating fully orthogonal sequences
% [tmpd, tmps]=genrandpskseq(N,M,amp);
% signalB2A(:,i)=tmps*2;
% signalA2B(:,i)=repmat(1+1j,76800,1);
% Db2a_T=[Db2a_T tmpd];
% if(length(indB)> ib) ib=ib+1; end
% end
end
%%------------Prepare the signals for B2A---------------%%
for i=1:4
if(indB(ib)==i)
[tmpd, tmps]=genrandpskseq(N,M,amp);
signalB2A(:,i)=tmps*2; %make sure LSB is 0 (switch=tx)
signalA2B(:,i)=repmat(1+1j,76800,1); %make sure LSB is 1 (switch=rx)
Db2a_T=[Db2a_T tmpd];
if(length(indB)> ib) ib=ib+1; end
end
end
if (~chanest_full)
signalB2A(1:38400,3)=0;
signalB2A(38401:end,2)=0;
Db2a_T(1:60,302:end) = 0;
Db2a_T(61:end,1:301) = 0;
end
Da2b_R=zeros(Niter*120,Nantb*301,Nmeas);
Db2a_R=zeros(Niter*120,Nanta*301,Nmeas);
chanestsA2B=zeros(301,Nanta,Nantb,Nmeas);
tchanestsA2B=zeros(512,Nanta,Nantb,Nmeas);
fchanestsA2B=zeros(512,Nanta,Nantb,Nmeas);
chanestsB2A=zeros(301,Nanta,Nantb,Nmeas);
tchanestsB2A=zeros(512,Nanta,Nantb,Nmeas);
fchanestsB2A=zeros(512,Nanta,Nantb,Nmeas);
for meas=1:Nmeas
%% ------- Node A to B transmission ------- %%
oarf_send_frame(card,signalA2B,n_bit);
%keyboard
sleep(0.01);
receivedA2B=oarf_get_frame(card);
%oarf_stop(card); %not good, since it does a reset
sleep(0.01);
%%----------Node B to A transmission---------%%
oarf_send_frame(card,signalB2A,n_bit);
%keyboard
sleep(0.01);
receivedB2A=oarf_get_frame(card);
%oarf_stop(card); %not good, since it does a reset
%% ------- Do the A to B channel estimation ------- %%
for i=0:119;
ifblock=receivedA2B(i*640+[1:640],indB);
ifblock(1:128,:)=[];
fblock=fft(ifblock);
fblock(1,:)=[];
fblock(151:360,:)=[];
Da2b_R((Niter-1)*120+i+1,:,meas)=vec(fblock);
end
if (chanest_full)
for ci=1:301;
data=Da2b_T(:,ci+[0:Nanta-1]*301);
rec=Da2b_R(:,ci+[0:Nantb-1]*301,meas);
chanestsA2B(ci,:,:,meas)=(inv(data'*data)*data'*rec).';
end
else
chanestsA2B(:,:,meas)=reshape(diag(repmat(Da2b_T,Niter,Nantb)'*Da2b_R(:,:,meas))/size(Da2b_T,1),301,Nantb);
end
fchanestsA2B(:,:,:,meas)=[zeros(1,Nanta,Nantb); chanestsA2B([1:150],:,:,meas); zeros(210,Nanta,Nantb); chanestsA2B(151:301,:,:,meas)];
tchanestsA2B(:,:,:,meas)=ifft(fchanestsA2B(:,:,:,meas));
%% ------- Do the B to A channel estimation ------- %%
for i=0:119;
ifblock=receivedB2A(i*640+[1:640],indA);
ifblock(1:128,:)=[];
fblock=fft(ifblock);
fblock(1,:)=[];
fblock(151:360,:)=[];
Db2a_R((Niter-1)*120+i+1,:,meas)=vec(fblock);
end
if (chanest_full)
for ci=1:301;
data=Db2a_T(:,ci+[0:Nantb-1]*301);
rec=Db2a_R(:,ci+[0:Nanta-1]*301,meas);
chanestsB2A(ci,:,:,meas)=(inv(data'*data)*data'*rec).';
end
else
chanestsB2A(:,:,meas)=reshape(diag(repmat(Db2a_T,Niter,1)'*repmat(Db2a_R(:,:,meas),1,Nantb)/(Niter*60)),301,Nantb);
end
fchanestsB2A(:,:,:,meas) = [zeros(1,Nanta,Nantb); chanestsB2A([1:150],:,:,meas); zeros(210,Nanta,Nantb); chanestsB2A(151:301,:,:,meas)];
tchanestsB2A(:,:,:,meas)=ifft(fchanestsB2A(:,:,:,meas));
end
%% -- Some plotting code -- %% (you can uncomment what you see fit)
received = [receivedB2A(:,indA) receivedA2B(:,indB)];
tchanests = [tchanestsA2B(:,:,end), tchanestsB2A(:,:,end)];
fchanests = [fchanestsA2B(:,:,end), fchanestsB2A(:,:,end)];
clf
figure(1)
for i=1:size(received,2);
subplot(220+i);
plot(20*log10(abs(fftshift(fft(received(:,i))))));
ylim([20 140])
end
figure(2)
t=[0:512-1]/512*1e-2;
plot(t,20*log10(abs(tchanests)))
xlabel('time')
ylabel('|h|')
legend('A->B1','A->B2','A->B3','B1->A','B2->A','B3->A');
%legend('A->B1','A->B2','B1->A','B2->A');
figure(3)
plot(20*log10(abs(fchanests)));
ylim([40 100])
xlabel('freq')
ylabel('|h|')
legend('A->B1','A->B2','A->B3','B1->A','B2->A','B3->A');
%legend('A->B1','A->B2','B1->A','B2->A');
if (0)
figure(4)
wndw = 50;
for i=1:5:Nantb*301 %# sliding window size
phamean = filter(ones(wndw,1)/wndw, 1, phases(:,i)); %# moving average
plot(phamean(wndw:end),'LineWidth',2);
title(['subcarrier ' num2str(i)]);
xlabel('time')
ylabel('phase')
ylim([-pi pi])
drawnow;
pause(0.1)
end
phavar=var(phases);
plotphavar=[];
for i=0:Nantb-1
plotphavar=[plotphavar; phavar([1:301]+i*301)];
end
plot([1:150 362:512],plotphavar,'o');
%ylim([0 pi])
xlabel('subcarrier')
ylabel('phase variance')
end
%% estimate F matrix assuming it is diagonal for sanity checking
Fhatloc = zeros(Nmeas,301,Nanta,Nantb);
for t=1:Nmeas
for s=1:301
for m=1:Nanta
for n=1:Nantb
ya=chanestsB2A(s,m,n,t);
yb=chanestsA2B(s,m,n,t);
Fhatloc(t,s,m,n)=(yb.*conj(ya))./(ya.*conj(ya));
end
end
end
end
figure(5)
plot_style={'rx','go','bs','kd'};
hold off
for m=1:Nanta
for n=1:Nantb
plot((squeeze(Fhatloc(:,:,m,n))),plot_style{m+(n-1)*2})
hold on
end
end
axis([-2 2 -2 2])
%disp(squeeze(mean(Fhatloc,2)));
else
error('You have to run init.params.m first!')
end
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