noise figure measurement in the frequency domain
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7773 818b1a75-f10b-46b9-bf7c-635c3b92a50f
This commit is contained in:
jiangx
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close all
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clear all
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hold off
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%gpib_card=0; % first GPIB PCI card in the computer
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%gpib_device=28; % this is configured in the signal generator Utilities->System->GPIB->Address menu
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smbv_ip_addr = "192.168.12.201";
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command = [getenv("OPENAIR_TARGETS") "/TEST/ROHDE_SCHWARZ/EthernetRawCommand.out"];
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fc = 1907600e3;
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%fc = 2.6e9;
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%fc=700e6;
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fs = 7680e3;
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fref = fc+fs/4;
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power_dBm = [-70 -80 -90]; %needs to be adjusted based on carrier freq
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cables_loss_dB = 11; % we need to account for the power loss between the signal generator and the card input (splitter, cables)
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nb_meas = 10;
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dual_tx = 0;
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tdd = 1;
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card = 0;
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limeparms;
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%rf_mode = (RXEN+TXEN+TXLPFNORM+TXLPFEN+TXLPF25+RXLPFNORM+RXLPFEN+RXLPF25+LNA1ON+LNAMax+RFBBNORM+DMAMODE_RX+DMAMODE_TX)*[1 1 1 1];
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rf_mode = (RXEN+0+TXLPFNORM+TXLPFEN+TXLPF25+RXLPFNORM+RXLPFEN+RXLPF25+LNA1ON+LNAMax+RFBBNORM+DMAMODE_RX+0)*[1 1 1 1];
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freq_rx = fc*[1 1 1 1];
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freq_tx = freq_rx;
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tx_gain = 25*[1 1 1 1];
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rx_gain = 15*[1 1 1 1];
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%rf_local= [8254744 8255063 8257340 8257340]; %rf_local*[1 1 1 1];
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rf_local = [8254813 8255016 8254813 8254813]; %exmimo2_2
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%rf_rxdc = rf_rxdc*[1 1 1 1];
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%rf_rxdc = ((128+rxdc_I) + (128+rxdc_Q)*(2^8))*[1 1 1 1];
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rf_rxdc = [37059 35459 36300 36999]; %exmimo2_2
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rf_vcocal=rf_vcocal_19G*[1 1 1 1];
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eNBflag = 0;
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tdd_config = DUPLEXMODE_FDD + TXRXSWITCH_TESTRX;
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syncmode = SYNCMODE_FREE;
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%syncmode = [SYNCMODE_MASTER SYNCMODE_SLAVE];
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rffe_rxg_low = 63*[1 1 1 1];
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rffe_rxg_final = 63*[1 1 1 1];
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rffe_band = B19G_TDD*[1 1 1 1];
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autocal = [1 1 1 1];
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resampling_factor = [2 2 2 2];
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system(sprintf('%s %s ''*RST;*CLS''',command, smbv_ip_addr)); % reset and configure the signal generator
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%gpib_send(gpib_card,gpib_device,sprintf("POW %ddBm",power_dBm+cables_loss_dB));
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%gpib_send(gpib_card,gpib_device,'POW -14dBm');
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%gpib_send(gpib_card,gpib_device,'FREQ 1.91860GHz');
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%gpib_send(gpib_card,gpib_device,'FREQ 1.919225GHz');
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%gpib_send(gpib_card,gpib_device,'FREQ 1.909225GHz');
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system(sprintf('%s %s ''FREQ %ldHz''',command,smbv_ip_addr,fref));
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%for card=1:oarf_get_num_detected_cards
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%oarf_config_exmimo(card-1,freq_rx,freq_tx,tdd_config,syncmode(card),rx_gain,tx_gain,eNBflag,rf_mode,rf_rxdc,rf_local,rf_vcocal,rffe_rxg_low,rffe_rxg_final,rffe_band,autocal,resampling_factor);
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%end
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autocal = [0 0 0 0];
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ALL_rxrfmode = [LNAByp LNAMed LNAMax];
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%ALL_rxrfmode = [LNAMax];
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ALL_gain = 0:10:30;
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num_chains = 4*oarf_get_num_detected_cards;
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SpN0 = zeros(length(ALL_rxrfmode),length(ALL_gain),num_chains);
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%SpN1 = zeros(length(ALL_rxrfmode),length(ALL_gain));
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N0 = zeros(length(ALL_rxrfmode),length(ALL_gain),num_chains);
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%N1 = zeros(length(ALL_rxrfmode),length(ALL_gain));
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S0 = zeros(length(ALL_rxrfmode),length(ALL_gain),num_chains);
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S0_lin = zeros(length(ALL_rxrfmode),length(ALL_gain),num_chains);
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%S1 = zeros(length(ALL_rxrfmode),length(ALL_gain),num_chains);
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G0 = zeros(length(ALL_rxrfmode),length(ALL_gain),num_chains);
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G1 = zeros(length(ALL_rxrfmode),length(ALL_gain),num_chains);
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NF0 = zeros(length(ALL_rxrfmode),length(ALL_gain),num_chains);
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NF1 = zeros(length(ALL_rxrfmode),length(ALL_gain),num_chains);
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NF2 = zeros(length(ALL_rxrfmode),length(ALL_gain),num_chains);
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SNR0 = zeros(length(ALL_rxrfmode),length(ALL_gain),num_chains);
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%SNR1 = zeros(length(ALL_rxrfmode),length(ALL_gain));
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%keyboard
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for mode_idx = 3
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LNA=ALL_rxrfmode(mode_idx);
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system(sprintf('%s %s ''POW %d dBm''',command,smbv_ip_addr,power_dBm(mode_idx)+cables_loss_dB));
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idx_gain = 1;
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for rx_gain=ALL_gain
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rf_mode = (RXEN+TXLPFNORM+TXLPFEN+TXLPF25+RXLPFNORM+RXLPFEN+RXLPF25+LNA1ON+LNA+RFBBNORM+DMAMODE_RX)*[1 1 1 1];
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rx_gain = rx_gain * [1 1 1 1];
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for card=1:oarf_get_num_detected_cards
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oarf_config_exmimo(card-1,freq_rx,freq_tx,tdd_config,syncmode(card),rx_gain,tx_gain,eNBflag,rf_mode,rf_rxdc,rf_local,rf_vcocal,rffe_rxg_low,rffe_rxg_final,rffe_band,autocal,resampling_factor);
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end
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sleep(1);
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% signal measurement
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system(sprintf('%s %s ''OUTP:STAT ON''',command,smbv_ip_addr)); % activate output
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sleep(.5);
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%f1 = (7.68*(0:length(s(:,2))-1)/(length(s(:,2))))-3.84;
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f1 = (7.68*(0:307200-1)/307200)-3.84;
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%nidx = find(f1>=0.5 & f1<=1.5); %1MHz
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nidx = find(f1>=1.5 & f1<=2.5); %1MHz
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sidx = find(f1>=1.87 & f1<=1.97); %100kHz
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SpN0_temp = 0;
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spn0_temp = 0;
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for k=1:nb_meas
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s=oarf_get_frame(0);
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sleep(.5);
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s = s - repmat(mean(s,1),size(s,1),1);
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SpN0_temp = SpN0_temp + mean(abs(s).^2,1) - abs(mean(s,1)).^2;
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sf = fftshift(fft(s),1)/sqrt(length(s));
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%np = 10*log10(sum(abs(sf(nidx,:)).^2));
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%sp_temp = sp_temp + 10*log10(sum(abs(sf(sidx,:)).^2));
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spn0_temp = spn0_temp + sum(abs(sf).^2);
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end
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%SpN0(mode_idx,idx_gain,:) = mean(abs(s).^2,1) - abs(mean(s,1)).^2;
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%SpN1(mode_idx,idx_gain) = mean(abs(s(:,2)).^2) - abs(mean(s(:,2))).^2;
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SpN0(mode_idx,idx_gain,:) = SpN0_temp/nb_meas;
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spn0 = spn0_temp/nb_meas;
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%keyboard;
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sf = fftshift(fft(s),1)/sqrt(length(s));
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figure(1);
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hold off
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plot(f1,20*log10(abs((sf(:,3)))),'r');
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hold on
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plot(f1(nidx),20*log10(abs(sf(nidx,3))),'b');
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plot(f1(sidx),20*log10(abs(sf(sidx,3))),'g');
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title("Signal");
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ylim([0 200]);
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% noise measurement
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system(sprintf('%s %s ''OUTP:STAT OFF''',command,smbv_ip_addr)); % deactivate output
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sleep(.5);
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N0_temp = 0;
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np_temp = 0;
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np_temp_unit = 0;
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for k=1:nb_meas
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s=oarf_get_frame(0); %oarf_get_frame
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sleep(.5);
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s = s - repmat(mean(s,1),size(s,1),1);
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N0_temp = N0_temp + mean(abs(s).^2,1) - abs(mean(s,1)).^2;
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%N1(idx_power,idx_gain) = mean(abs(s(:,2)).^2) - abs(mean(s(:,2))).^2;
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sf = fftshift(fft(s),1)/sqrt(length(s));
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np_temp = np_temp + sum(abs(sf).^2);
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np_temp_unit = np_temp_unit + sum(abs(sf(nidx,:)).^2);
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end
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N0(mode_idx,idx_gain,:) = N0_temp/nb_meas;
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%N0(mode_idx,idx_gain,:) = mean(abs(s).^2,1) - abs(mean(s,1)).^2;
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%N1(mode_idx,idx_gain) = mean(abs(s(:,2)).^2) - abs(mean(s(:,2))).^2;
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%G1(mode_idx,idx_gain,:) = sp - power_dBm(mode_idx);
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np = np_temp/nb_meas;
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snr = 10*log10((spn0-np)./np); %measured snr
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snr_real = power_dBm(mode_idx) - (-174 + 10*log10(7.68e6)); %signal over thermal noise
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np_unit = np_temp_unit/nb_meas;
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snr_output_unit = 10*log10((spn0-np_unit)./np_unit); %measured snr
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snr_input_unit = power_dBm(mode_idx) - (-174 + 10*log10(1e6)); %signal over thermal noise
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NF1(mode_idx,idx_gain,:) = snr_real - snr;
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NF2(mode_idx,idx_gain,:) = snr_input_unit - snr_output_unit;
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sf = fftshift(fft(s),1)/sqrt(length(s));
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figure(2);
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hold off
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plot(f1,20*log10(abs((sf(:,3)))),'r');
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title("Noise");
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ylim([0 200]);
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% do some plausibility checks
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% if ((N0(mode_idx,idx_gain) > SpN0(mode_idx,idx_gain)) ||
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% (N1(mode_idx,idx_gain) > SpN1(mode_idx,idx_gain)))
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% error("something is wrong");
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% end
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S0_lin(mode_idx,idx_gain,:) = SpN0(mode_idx,idx_gain,:)-N0(mode_idx,idx_gain,:);
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S0_lin(mode_idx,idx_gain,S0_lin(mode_idx,idx_gain,:)<0) = 0;
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S0(mode_idx,idx_gain,:) = 10*log10(S0_lin(mode_idx,idx_gain,:));
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%S1(mode_idx,idx_gain) = 10*log10(SpN1(mode_idx,idx_gain)-N1(mode_idx,idx_gain));
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G0(mode_idx,idx_gain,:) = S0(mode_idx,idx_gain,:) - power_dBm(mode_idx);
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%G1(mode_idx,idx_gain) = S1(mode_idx,idx_gain) - power_dBm;
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NF0(mode_idx,idx_gain,:) = 10*log10(N0(mode_idx,idx_gain,:)) - G0(mode_idx,idx_gain,:) + 105; % 108 is the thermal noise
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%NF1(mode_idx,idx_gain) = 10*log10(N1(mode_idx,idx_gain)) - G1(mode_idx,idx_gain) + 105;
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SNR0(mode_idx,idx_gain,:) = S0(mode_idx,idx_gain,:)-10*log10(N0(mode_idx,idx_gain,:));
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%SNR1(mode_idx,idx_gain) = S1(mode_idx,idx_gain)-10*log10(N1(mode_idx,idx_gain));
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%printf(' %d: Signal strength (%f,%f), Gain (%f %f), N (%f %f) SNR (%f %f) NF (%f %f)\n',
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% rx_gain(1), S0(mode_idx,idx_gain),S1(mode_idx,idx_gain),
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% G0(mode_idx,idx_gain),G1(mode_idx,idx_gain),
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% 10*log10(N0(mode_idx,idx_gain)),10*log10(N1(mode_idx,idx_gain)),
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% SNR0(mode_idx,idx_gain),SNR1(mode_idx,idx_gain),
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% NF0(mode_idx,idx_gain),NF1(mode_idx,idx_gain));
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%fflush(stdout);
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%fprintf(fid,'%d, %d, %d, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f\n',
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%power_dBm,gain2391,gain9862, S0,S1,G0,G1,10*log10(N0),10*log10(N1),SNR0,SNR1,NF0,NF1);
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%keyboard
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figure(3)
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hold off
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plot(ALL_gain,G0(:,:,1),'o-','markersize',10)
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hold on
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plot(ALL_gain,G0(:,:,2),'x-','markersize',10)
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plot(ALL_gain,G0(:,:,3),'s-','markersize',10)
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plot(ALL_gain,G0(:,:,4),'d-','markersize',10)
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%legend('Byp RX0','Med RX0','Max RX0','Byp RX1','Med RX1','Max RX1');
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legend('Byp RX0','Med RX0','Max RX0','Byp RX1','Med RX1','Max RX1','Byp RX2','Med RX2','Max RX2','Byp RX3','Med RX3','Max RX3');
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title('Gains')
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xlabel('rx gains (dB)')
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ylabel('NF (dB)')
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figure(4)
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hold off
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plot(ALL_gain,NF0(:,:,1),'o-','markersize',10)
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hold on
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plot(ALL_gain,NF0(:,:,2),'x-','markersize',10)
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plot(ALL_gain,NF0(:,:,3),'s-','markersize',10)
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plot(ALL_gain,NF0(:,:,4),'d-','markersize',10)
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%legend('Byp RX0','Med RX0','Max RX0','Byp RX1','Med RX1','Max RX1');
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legend('Byp RX0','Med RX0','Max RX0','Byp RX1','Med RX1','Max RX1','Byp RX2','Med RX2','Max RX2','Byp RX3','Med RX3','Max RX3');
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title('Averaged Noise Figure measured in time domain')
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xlabel('rx gains (dB)')
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ylabel('NF (dB)')
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figure(5)
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hold off
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plot(ALL_gain,NF1(:,:,1),'o-','markersize',10)
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hold on
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plot(ALL_gain,NF1(:,:,2),'x-','markersize',10)
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plot(ALL_gain,NF1(:,:,3),'s-','markersize',10)
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plot(ALL_gain,NF1(:,:,4),'d-','markersize',10)
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%legend('Byp RX0','Med RX0','Max RX0','Byp RX1','Med RX1','Max RX1');
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legend('Byp RX0','Med RX0','Max RX0','Byp RX1','Med RX1','Max RX1','Byp RX2','Med RX2','Max RX2','Byp RX3','Med RX3','Max RX3');
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title('Averaged Noise Figure measured in frequency domain')
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xlabel('rx gains (dB)')
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ylabel('NF (dB)')
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figure(6)
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hold off
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plot(ALL_gain,NF2(:,:,1),'o-','markersize',10)
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hold on
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plot(ALL_gain,NF2(:,:,2),'x-','markersize',10)
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plot(ALL_gain,NF2(:,:,3),'s-','markersize',10)
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plot(ALL_gain,NF2(:,:,4),'d-','markersize',10)
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%legend('Byp RX0','Med RX0','Max RX0','Byp RX1','Med RX1','Max RX1');
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legend('Byp RX0','Med RX0','Max RX0','Byp RX1','Med RX1','Max RX1','Byp RX2','Med RX2','Max RX2','Byp RX3','Med RX3','Max RX3');
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title('Unit Bandwidth Noise Figure measured in frequency domain')
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xlabel('rx gains (dB)')
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ylabel('NF (dB)')
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idx_gain = idx_gain + 1;
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end
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end
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%gpib_send(gpib_card,gpib_device,'OUTP:STAT OFF'); % deactivate output
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%l0 = [ALL_gain2391; ones(size(ALL_gain2391))].'\G0;
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%l1 = [ALL_gain2391; ones(size(ALL_gain2391))].'\G1;
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