Refined the code so as to make it more readable.
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4039 818b1a75-f10b-46b9-bf7c-635c3b92a50f
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Cirkic
@@ -1,32 +0,0 @@
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function [carrierdata, s]=genorthqpskseq(Ns,N,amp)
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if(N!=512*150)
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error('The sequence length must be 76800.');
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endif
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s = zeros(N,Ns);
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H=1; for k=1:log2(128) H=[H H; H -H]; end; H=H(:,1:120);
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i=1; while(i<size(H,1)) h=H(i,:); inds=find(h*H'!=0); H(inds,:)=[]; H=[h; H]; i=i+1; end
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Hc=H+sqrt(-1)*H;
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if(sum(Hc*Hc'-240*eye(8))>0) error("The code is not orhtogonal\n"); endif
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carrierdata=zeros(120,Ns*301);
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orthinds=1:8;
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for i=1:301
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for k=1:Ns
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randind=ceil((9-k)*rand());
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carrierdata(:,i+(k-1)*301)=Hc(orthinds(randind),:)';
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orthinds(randind)=[];
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endfor
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endfor
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for k=1:Ns
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for i=0:119
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fblock=[0 carrierdata(i,1:150) zeros(1,210) carrierdata(i,151:301)];
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ifblock=ifft(fblock,512);
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block = [ifblock(end-127:end) ifblock]; # Cycl. prefix
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s([1:640]+i*640,k)=floor(amp*block);
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endfor
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endfor
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endfunction
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@@ -1,3 +1,7 @@
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# % Author: Mirsad Cirkic
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# % Organisation: Eurecom (and Linkoping University)
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# % E-mail: mirsad.cirkic@liu.se
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function [carrierdata, s]=genorthqpskseq(Ns,N,amp)
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if(N!=512*150)
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@@ -1,3 +1,8 @@
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# % Author: Mirsad Cirkic
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# % Organisation: Eurecom (and Linkoping University)
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# % E-mail: mirsad.cirkic@liu.se
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function [carrierdata, s]=genrandpskseq(N,M,amp)
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if(mod(N,640)~=0)
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@@ -1,3 +1,7 @@
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# % Author: Mirsad Cirkic
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# % Organisation: Eurecom (and Linkoping University)
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# % E-mail: mirsad.cirkic@liu.se
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clear
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paramsinitialized=false;
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limeparms;
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@@ -8,7 +12,7 @@ card = 0;
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Ntrx=4;
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dual_tx=0;
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active_rfA=[1 0 0 0];
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active_rfB=[0 1 1 0];
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active_rfB=[0 1 0 0];
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active_rf=active_rfA+active_rfB;
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%fc = 2660000000;
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@@ -1,3 +1,7 @@
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# % Author: Mirsad Cirkic
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# % Organisation: Eurecom (and Linkoping University)
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# % E-mail: mirsad.cirkic@liu.se
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if(paramsinitialized)
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N=76800;
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M=4;
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@@ -116,7 +120,7 @@ if(paramsinitialized)
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oarf_stop(card);
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# # -- Do the channel estimation
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chanests=reshape(diag(repmat(Db2a_T,Niter,1)'*repmat(Db2a_R,1,Nantb)/(Niter*120)),301,Nantb)
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chanests=reshape(diag(repmat(Db2a_T,Niter,1)'*repmat(Db2a_R,1,Nantb)/(Niter*120)),301,Nantb);
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H=conj(repmat(Db2a_T,Niter,1)).*repmat(Db2a_R,1,Nantb);
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phases=unwrap(angle(H));
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# for i=0:(Nantb-1)
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@@ -0,0 +1,141 @@
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# % Author: Mirsad Cirkic
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# % Organisation: Eurecom (and Linkoping University)
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# % E-mail: mirsad.cirkic@liu.se
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if(paramsinitialized)
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disp("This code is so far only written for single runs. Multiple \
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runs will overwrite the previous measurement data, i.e., the \
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data structures are not defined for multiple runs. You will need to \
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add code in order to save the intermediate measurements.")
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N=76800;
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M=4;
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signalB2A=zeros(N,1);
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signalA2B=zeros(N,4);
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indA=find(active_rfA==1);
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indB=find(active_rfB==1);
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Nanta=length(indA);
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Nantb=length(indB);
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if(Nanta!=1) error("Node A can only have one antenna active\n"); endif
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Niter=1;
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if(Niter!=1) error("We should only use one get_frame at each \
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run.\n");
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endif
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# %% ------- Prepare the signals for both A2B and B2A ------- %%
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[Da2b_T, signalA2B]=genrandpskseq(N,M,amp);
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signalA2B=repmat(signalA2B,1,4);
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signalB2A=zeros(N,4);
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[Db2a_T,tmps]=genorthqpskseq(Nantb,N,amp);
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ind=1;
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for i=1:4
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if(indB(ind)==i)
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signalB2A(:,i)=tmps(:,ind);
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if(length(indB)> ind) ind=ind+1; endif
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endif
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endfor
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# %% ------- Node A to B transmission/reception ------- %%
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rf_mode_current = rf_mode + (DMAMODE_TX+TXEN)*active_rfA +(DMAMODE_RX+RXEN)*active_rfB;
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oarf_config_exmimo(card, freq_rx,freq_tx,tdd_config,syncmode,rx_gain,tx_gain,eNB_flag,rf_mode_current,rf_rxdc,rf_local,rf_vcocal,rffe_rxg_low,rffe_rxg_final,rffe_band,autocal_mode);
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oarf_send_frame(card,signalA2B,n_bit);
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receivedB2A=oarf_get_frame(card);
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oarf_stop(card);
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# %% ------- Node B to A transmission/reception ------- %%
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rf_mode_current = rf_mode + (DMAMODE_TX+TXEN)*active_rfB +(DMAMODE_RX+RXEN)*active_rfA;
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oarf_config_exmimo(card, freq_rx,freq_tx,tdd_config,syncmode,rx_gain,tx_gain,eNB_flag,rf_mode_current,rf_rxdc,rf_local,rf_vcocal,rffe_rxg_low,rffe_rxg_final,rffe_band,autocal_mode);
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oarf_send_frame(card,signalB2A,n_bit);
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receivedB2A=oarf_get_frame(card);
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oarf_stop(card);
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# %% ------- Do the A to B channel estimation ------- %%
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Da2b_R=zeros(Niter*120,Nantb*301);
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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(iter*120+i+1,:)=vec(fblock);
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endfor
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HA2B=conj(Da2b_T).*Da2b_R;
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phasesA2B=unwrap(angle(HA2B));
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if(mean(var(phasesA2B))>0.5)
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disp("The phases of your estimates are a bit high (larger than 0.5 rad.), something is wrong.");
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endif
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chanestsA2B=diag(Da2b_T'*Da2b_R)/size(Da2b_T,1);
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for i=0:(Nantb-1)
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fchanestsA2B(:,i+1)=[0; chanestsA2B(301*i+[1:150]); zeros(210,1); chanestsA2B(301*i+[151:301])];
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endfor
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tchanestsA2B=ifft(fchanestsA2B);
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%% ------- Do the B to A channel estimation ------- %%
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Db2a_R=zeros(Niter*120,Nanta*301);
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for i=0:119;
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ifblock=receivedB2A(i*640+[1:640],indA);
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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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Db2a_R(iter*120+i+1,:)=fblock.';
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endfor
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HB2A=conj(repmat(Db2a_T,Niter,1)).*repmat(Db2a_R,1,Nantb);
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phasesB2A=unwrap(angle(HB2A));
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if(mean(var(phasesB2A))>0.5)
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disp("The phases of your estimates are a bit high (larger than 0.5 rad.), something is wrong.");
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endif
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chanestsB2A=reshape(diag(repmat(Db2a_T,Niter,1)'*repmat(Db2a_R,1,Nantb)/(Niter*120)),301,Nantb);
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# %% -- Some plotting code -- %% (you can uncomment what you see fit)
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# clf
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# figure(1)
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# for i=1:4
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# subplot(220+i);plot(20*log10(abs(fftshift(fft(receivedA2B(:,i))))));
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# endfor
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# figure(2)
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# t=[0:512-1]/512*1e-2;
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# plot(t,abs(tchanests))
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# xlabel('time')
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# ylabel('|h|')
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# figure(3)
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# % wndw = 50;
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# % for i=1:5:Nantb*301 %# sliding window size
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# % phamean = filter(ones(wndw,1)/wndw, 1, phases(:,i)); %# moving average
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# % plot(phamean(wndw:end),'LineWidth',2);
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# % title(['subcarrier ' num2str(i)]);
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# % xlabel('time')
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# % ylabel('phase')
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# % ylim([-pi pi])
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# % drawnow;
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# % pause(0.1)
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# % endfor
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# phavar=var(phases);
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# plotphavar=[];
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# for i=0:Nantb-1
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# plotphavar=[plotphavar; phavar([1:301]+i*301)];
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# endfor
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# plot([1:150 362:512],plotphavar,'o');
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# %ylim([0 pi])
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# xlabel('subcarrier')
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# ylabel('phase variance')
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# figure(4)
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# plot(20*log10(abs(fchanests))), ylim([40 100])
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# %end
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# fprintf(' done\n')
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# for i=0:(Nantb-1)
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# fchanests(:,i+1)=[0; chanests(301*i+[1:150]); zeros(210,1); chanests(301*i+[151:301])];
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# endfor
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# tchanests=ifft(fchanests);
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else
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error("You have to run init.params.m first!")
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end
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