Commit af6f5a38 authored by Florian Kaltenberger's avatar Florian Kaltenberger
Browse files

bugfixes - now works with dual carrier EMOS files


git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5324 818b1a75-f10b-46b9-bf7c-635c3b92a50f
parent 9026fda4
......@@ -13,7 +13,6 @@ primary_synch; %loads the primary sync signal
load('ofdm_pilots_sync_30MHz.mat');
n_carriers = 2; % use 1 for UHF and 2 for 2.6GHz
nframes = 100; % frames in one block
symbols_per_slot = 6;
slots_per_frame = 20;
......@@ -25,13 +24,18 @@ switch n_carriers
%filename = 'E:\EMOS\corridor\trials1\eNB_data_20140331_UHF_run1.EMOS';
filename = 'D:\trials1 train extracted\eNB_data_20140331_UHF_run1.EMOS';
nframes = 100; % frames in one block
threshold = 3e+4 ; % maybe should change that !!!!
case 2,
p(1) = init_params(50,2,4);
p(2) = init_params(100,2,4);
pss_t = upsample(primary_synch0_time,4*2); % this assumes we are doing the sync on the first carrier, which is 10MHz
p(1) = init_params(100,2,4);
p(2) = init_params(50,2,4);
pss_t = upsample(primary_synch0_time,4*4); % this assumes we are doing the sync on the first carrier, which is 10MHz
%filename = 'E:\EMOS\corridor\trials1\eNB_data_20140331_UHF_run1.EMOS';
filename = 'D:\trials1 train extracted\eNB_data_20140331_2.6GHz_run1.EMOS';
nframes = 50; % frames in one block
threshold = 1e+4 ; % maybe should change that !!!!
end
destdir = 'E:\EMOS\corridor\trials1 train';
......@@ -54,9 +58,7 @@ block = 1;
flag1 = 1;
start=2;
threshold = 3e+4 ; % maybe should change that !!!!
fseek(fid,samples_slot_agg*slots_per_frame*nframes*120*2,'bof'); %advance 30 sec
%fseek(fid,samples_slot_agg*slots_per_frame*nframes*120*2,'bof'); %advance 30 sec
while ~feof(fid)
fprintf(1,'Processing block %d of %d',block,nblocks);
......@@ -68,21 +70,21 @@ while ~feof(fid)
v0 = double(v(1:2:end))+1j*double(v(2:2:end));
v1 = zeros(p(1).samples_slot*slots_per_frame*nframes,p(1).nant_rx);
if n_carriers==2
v2 = zeros(p(2).samples_slot*slots_per_frame*nframes,p(2).nant_rx);
end
for slot=1:slots_per_frame*nframes
for a=1:p(1).nant_rx
v1((slot-1)*p(1).samples_slot+1:slot*p(1).samples_slot,a) = ...
v0((slot-1)*samples_slot_agg+(a-1)*p(1).samples_slot+1:...
(slot-1)*samples_slot_agg+ a *p(1).samples_slot,1);
(slot-1)*samples_slot_agg+ a *p(1).samples_slot,1);
end
end
if n_carriers==2
v2 = zeros(p(2).samples_slot*slots_per_frame*nframes,p(2).nant_rx);
for slot=1:slots_per_frame*nframes
if n_carriers==2
for a=1:p(2).nant_rx
v2((slot-1)*p(2).samples_slot+1:slot*p(2).samples_slot,a) = ...
v0((slot-1)*samples_slot_agg+(a-1)*p(2).samples_slot+1:...
(slot-1)*samples_slot_agg+ a *p(2).samples_slot,1);
v0((slot-1)*samples_slot_agg+p(1).nant_rx*p(1).samples_slot+(a-1)*p(2).samples_slot+1:...
(slot-1)*samples_slot_agg+p(1).nant_rx*p(1).samples_slot+ a *p(2).samples_slot,1);
end
end
end
......@@ -96,10 +98,10 @@ while ~feof(fid)
end
if n_carriers==2
v2 = [vStorage1; v2] ;
v2 = [vStorage2; v2] ;
if size(v2,1) > p(2).frame_length*nframes ;
nframes = floor(size(v2,1) / p(2).frame_length) ;
vStorage1 = v2(p(2).frame_length*nframes+1:end,:) ;
vStorage2 = v2(p(2).frame_length*nframes+1:end,:) ;
v2(p(2).frame_length*nframes + 1 : end,:) = [] ;
start = 1 ;
end
......@@ -158,7 +160,7 @@ while ~feof(fid)
fprintf(1,'.');
frame_start1 = (slots_per_frame*p(1).samples_slot)*(i-1)+frame_offset+1;
if n_carriers==2
frame_start2 = (slots_per_frame*p(2).samples_slot)*(i-1)+frame_offset*2+1;
frame_start2 = (slots_per_frame*p(2).samples_slot)*(i-1)+round(frame_offset/2)+1;
end
if i<nframes
......@@ -172,78 +174,81 @@ while ~feof(fid)
if n_carriers==2
vStorage2 = [v2(frame_start2:end,:) ; vStorage2]; %%
end
break
end
%% MIMO channel estimation
if (n_carriers==1)
transmit_f1 = f3;
else
transmit_f1 = f2;
transmit_f2 = f1;
transmit_f1 = f1;
transmit_f2 = f2;
end
for carrier=1:n_carriers
if (carrier==1)
transmit_f = transmit_f1;
received_f = received_f1;
else
transmit_f = transmit_f2;
received_f = received_f2;
end
H = zeros(num_symbols_frame/2,p(carrier).useful_carriers/4,p(carrier).nant_tx,p(carrier).nant_rx);
for itx=1:p(carrier).nant_tx
% f_start and t_start indicate the start of the pilots in time
% and frequency according to the specifications (see .doc file).
% t_start has to be >=2, since the first symbol is the PSS.
f_start = mod(itx-1,2)*2+1;
t_start = floor((itx-1)/2)+1;
for irx=1:p(carrier).nant_rx
H(:,:,itx,irx)=conj(squeeze(transmit_f(itx,t_start:2:end,f_start:4:end))).*received_f(t_start:2:end,f_start:4:end,irx);
if (carrier==1)
transmit_f = transmit_f1;
received_f = received_f1;
else
transmit_f = transmit_f2;
received_f = received_f2;
end
end
Ht = ifft(H,[],2);
PDP = mean(abs(Ht).^2,1);
PDP_all = squeeze(mean(mean(PDP,3),4));
%PDP_total((block-1)*nframes+i+1,:,:,:) = PDP;
if enable_plots>=1
figure(3+2*(carrier-1))
H = zeros(num_symbols_frame/2,p(carrier).useful_carriers/4,p(carrier).nant_tx,p(carrier).nant_rx);
for itx=1:p(carrier).nant_tx
for irx=1:p(1).nant_rx
subplot(p(1).nant_tx,p(1).nant_rx,(itx-1)*p(1).nant_rx + irx);
surf(20*log10(abs(Ht(:,:,itx,irx))))
%xlabel('time [OFDM symbol]')
%ylabel('delay time [samples]')
%zlabel('power [dB]')
shading interp
% f_start and t_start indicate the start of the pilots in time
% and frequency according to the specifications (see .doc file).
% t_start has to be >=2, since the first symbol is the PSS.
f_start = mod(itx-1,2)*2+1;
t_start = floor((itx-1)/2)+1;
for irx=1:p(carrier).nant_rx
H(:,:,itx,irx)=conj(squeeze(transmit_f(itx,t_start:2:end,f_start:4:end))).*received_f(t_start:2:end,f_start:4:end,irx);
end
end
figure(4+2*(carrier-1))
for itx=1:p(1).nant_tx
for irx=1:p(1).nant_rx
subplot(p(1).nant_tx,p(1).nant_rx,(itx-1)*p(1).nant_rx + irx);
plot(10*log10(PDP(:,:,itx,irx)))
ylim([50 80])
xlim([0 75])
%xlabel('delay time [samples]')
%ylabel('power [dB]')
Ht = ifft(H,[],2);
PDP = mean(abs(Ht).^2,1);
PDP_all = squeeze(mean(mean(PDP,3),4));
%PDP_total((block-1)*nframes+i+1,:,:,:) = PDP;
if enable_plots>=1
figure(3+2*(carrier-1))
for itx=1:p(carrier).nant_tx
for irx=1:p(1).nant_rx
subplot(p(1).nant_tx,p(1).nant_rx,(itx-1)*p(1).nant_rx + irx);
surf(20*log10(abs(Ht(:,:,itx,irx))))
%xlabel('time [OFDM symbol]')
%ylabel('delay time [samples]')
%zlabel('power [dB]')
shading interp
end
end
figure(4+2*(carrier-1))
for itx=1:p(1).nant_tx
for irx=1:p(1).nant_rx
subplot(p(1).nant_tx,p(1).nant_rx,(itx-1)*p(1).nant_rx + irx);
plot(10*log10(PDP(:,:,itx,irx)))
ylim([50 80])
xlim([0 75])
%xlabel('delay time [samples]')
%ylabel('power [dB]')
end
end
drawnow
end
if carrier==1
% adjust frame offset base on channel estimate to compensate for
% timing drift. We try to keep the peak of the impulse response at
% sample prefix_length/8.
[m,idx] = max(fft(ifft(PDP_all),p(carrier).num_carriers));
offset = idx - p(carrier).prefix_length/8;
if offset > p(carrier).prefix_length
offset = offset - p(carrier).num_carriers;
end
if abs(offset) > 5
frame_offset = frame_offset + round(offset/4);
end
end
drawnow
end
end
% adjust frame offset base on channel estimate to compensate for
% timing drift. We try to keep the peak of the impulse response at
% sample prefix_length/8.
[m,idx] = max(fft(ifft(PDP_all),p(1).num_carriers));
offset = idx - p(1).prefix_length/8;
if offset > p(1).prefix_length
offset = offset - p(1).num_carriers;
end
if abs(offset) > 5
frame_offset = frame_offset + round(offset/4);
end
end
......
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