Florian Kaltenberger
6c11825d2e
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4603 818b1a75-f10b-46b9-bf7c-635c3b92a50f
255 lines
7.8 KiB
Matlab
255 lines
7.8 KiB
Matlab
% 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
|
|
if (0)
|
|
figure(1)
|
|
for i=1:size(received,2);
|
|
subplot(220+i);
|
|
plot(20*log10(abs(fftshift(fft(received(:,i))))));
|
|
ylim([20 140])
|
|
end
|
|
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
|
|
|
|
figure(4);
|
|
for t=1
|
|
i=1;
|
|
for m=1:Nanta
|
|
for n=1:Nantb
|
|
subplot(Nanta,Nantb,i);
|
|
plot(20*log10(abs(fchanestsB2A(:,m,n,t))))
|
|
hold on
|
|
plot(20*log10(abs(fchanestsA2B(:,m,n,t))),'r')
|
|
ylim([0 80])
|
|
i=i+1;
|
|
end
|
|
end
|
|
end
|
|
|
|
figure(5)
|
|
for t=1
|
|
for m=1:Nanta
|
|
subplot(2,4,m);
|
|
Rb2a_comp = repmat(chanestsB2A(:,m,m,t)',120,1).*Db2a_R(:,(m-1)*301+(1:301),t);
|
|
plot(Rb2a_comp(:),'x');
|
|
subplot(2,4,4+m);
|
|
Ra2b_comp = repmat(chanestsA2B(:,m,m,t)',120,1).*Da2b_R(:,(m-1)*301+(1:301),t);
|
|
plot(Ra2b_comp(:),'rx');
|
|
end
|
|
end
|
|
|
|
if (0)
|
|
%% 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)));
|
|
end
|
|
|
|
else
|
|
error('You have to run init.params.m first!')
|
|
end
|