FSO data:
- demystifyied dataset - matched filter - timing sync (whole sig, not symbol based) - EQ is worse, I guess due to symbol timing recovery Pulsef: - can be used as matched filter now, the only thing I really changed was the sampling behavior - before it assumed that the input is always fsym, now it can be anything... fdac is output frequency for both methods
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silas (home)
@@ -1,12 +1,141 @@
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datas = load("C:\Users\Silas\Downloads\FSO_FP_QCL_60umUTC\FSO_FP_QCL_60umUTC\6G_PAM4\M=4_Rs=6e9_Fs=8e10_I=225mA_RoP=28.02mW_L=31m_PS=RRC_rolloff=0.6_Mode=Rise.mat");
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base = "C:\Users\Silas\Nextcloud\Dokumente\02_Ablage_Office\FSO_FP_QCL_60umUTC";
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mode = 0; %0 oder 1
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M = 2;
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fsym = 6e9;
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fs = 80e9;
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all_files = dir(fullfile(base, "**/*.mat"));
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rawsignal = datas.tr.lastData(1).trace.ch3.RawData;
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if M == 2
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tx_data = load("C:\Users\Silas\Nextcloud\Dokumente\02_Ablage_Office\FSO_FP_QCL_60umUTC\14G_PAM2\tx_info\tx_info_PAM2_14Gbd0.75RRC.mat");
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filename = fullfile(base, "14G_PAM2\M=2_Rs=1.4e10_Fs=8e10_I=265mA_RoP=46.3mW_L=31m_PS=RRC_rolloff=0.75_Mode=Rise.mat");
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elseif M == 4
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tx_data = load("C:\Users\Silas\Nextcloud\Dokumente\02_Ablage_Office\FSO_FP_QCL_60umUTC\6G_PAM4\tx_info\tx_info_PAM4_6Gbd0.6RRC.mat");
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filename = fullfile(base, "6G_PAM4\M=4_Rs=6e9_Fs=8e10_I=255mA_RoP=42.3mW_L=31m_PS=RRC_rolloff=0.6_Mode=Rise.mat");
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end
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Scope_sig = Electricalsignal(rawsignal,"fs",fs);
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if mode == 1
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[f, p] = uigetfile(fullfile(base, "**/*.mat"));
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if f~=0
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filename = fullfile(p,f);
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end
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end
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datas = load(filename);
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%%
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str = filename;
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M_ = str2double(regexp(str, 'M=([^_]+)', 'tokens', 'once'));
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assert(M==M_);
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fsym = str2double(regexp(str, 'Rs=([^_]+)', 'tokens', 'once'));
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fs = str2double(regexp(str, 'Fs=([^_]+)', 'tokens', 'once'));
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I = sscanf(char(regexp(str, 'I=([^_]+)', 'tokens', 'once')), '%f');
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rop = sscanf(char(regexp(str, 'RoP=([^_]+)', 'tokens', 'once')), '%f');
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L = sscanf(char(regexp(str, 'L=([^_]+)', 'tokens', 'once')), '%f');
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pulseshape = string( regexp(str, 'PS=([^_]+)', 'tokens', 'once'));
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rolloff = str2double(regexp(str, 'rolloff=([^_]+)', 'tokens', 'once'));
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mode = string( regexp(str, 'Mode=([^\.]+)', 'tokens', 'once'));
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%%
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% Tx data
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Bits = Informationsignal(tx_data.tx_data,"fs",fsym);
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Symbols = Informationsignal(real(tx_data.tx_PAM_sym),"fs",fsym);
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mapping_style = M==4; % Pam2 is like move-it; PAM-4 is different, same mapping like ETH peopled used in Zurich... hence the "eth_style" argument here and there
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PM = PAMmapper(M,0,"eth_style",mapping_style); % one should rename "eth style" as this is simply a different mapping scheme
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Symbols_ = PM.map(Bits) .* PM.scaling;
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assert(isequal(Symbols.signal,Symbols_.signal));
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Bits_ = PM.demap(Symbols);
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[bits,errors,ber,errorIndice] = calc_ber(Bits_.signal,Bits.signal);
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assert(ber == 0);
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%% For comparison, apply pulsef on Tx Symbols
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Pform = Pulseformer("fsym",fsym,"fdac",fs,"pulse","rc","pulselength",16,"alpha",rolloff);
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Digi_sig_compare = Pform.process(Symbols);
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MF = Pulseformer("fsym",fsym,"fdac",2*fsym,"pulse","rrc","pulselength",16,"alpha",rolloff);
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Rx_sig_compare = MF.process(Digi_sig_compare);
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%%
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% Rx Data
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traceData = datas.tr.lastData(2).trace.ch3;
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%FYI: Voltage=(RawData−YReference)×YIncrement+YOrigin
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scoperead_volts = (traceData.RawData - traceData.YReference) * traceData.YIncrement + traceData.YOrigin;
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demystified = isequal(traceData.YData,scoperead_volts);
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assert(demystified);
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Scope_sig = Electricalsignal(traceData.YData,"fs",fs);
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Scope_sig.plot("displayname",'raw','fignum',100);
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Scope_sig.spectrum("displayname",'raw','fignum',101)
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% 1) matched filter
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% pulse is symmetric, hence we can use pulsef firectly as matched filter.
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% It feels off (bit I think correct) that the fsym is now the output freq.!!
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% -> output 2 sps to omit timing recovery!?
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Pform = Pulseformer("fsym",fsym,"fdac",2*fsym,"pulse","rrc","pulselength",16,"alpha",rolloff,"matched",1);
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Rx_matched = Pform.process(Scope_sig);
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Rx_matched.spectrum("displayname",'Signal after matched filter','fignum',1);
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% timing sync -> at this point we still have no symbol timing recovery, we
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% try to do this with 2sps EQ!
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[~,Rx_synced_cell,inverted,sequenceFound,sequenceStarts] = Rx_matched.tsynch("reference", Symbols, "fs_ref", fsym, "debug_plots", 1);
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%% not working..
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Rx_synced = Rx_synced_cell{1};
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len_tr = 4096*2;
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mu_ffe1 = 0.0001;
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mu_ffe2 = 0.0008;
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mu_ffe3 = 0.001;
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mu_dc = 0.005;
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mu_ffe = [mu_ffe1 mu_ffe3 mu_ffe3];
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mu_dfe = 0.0004;
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duob_mode = db_mode.no_db;
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Rx_synced.plot("displayname",'RX: Matched+Sync+2sps','fignum',2);
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Digi_sig_compare.normalize("mode","rms").spectrum("displayname",'Tx: RC-shaped','fignum',1,'normalizeTo0dB',0);
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Rx_sig_compare.normalize("mode","rms").spectrum("displayname",'Tx: RC-shaped + matched filtered ','fignum',1,'normalizeTo0dB',0);
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Rx_synced.normalize("mode","rms").spectrum("displayname",'RX: matched filtered + synced','fignum',1,'normalizeTo0dB',0);
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if M == 2
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ber_in_paper = 10^(-2.6); %fig 3a) 4 Gb/s MWIR FSO Transmission using Directly Modulated QCL and an Uncooled UTC-PD at Room-Temperature
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elseif M == 4
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ber_in_paper = 10^(-2.5);
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end
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%% -------------------- FFE --------------------
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% requires some more digging what is going on :-)
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eq_ffe = EQ("Ne",[50, 5, 5],"Nb",[2,0,0], ...
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"training_length",len_tr,"training_loops",5,"dd_loops",5, ...
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"K",2,"DCmu",mu_dc,"DDmu",[mu_ffe mu_dfe],"DFEmu",0.005, ...
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"FFEmu",0,"plotfinal",0,"ideal_dfe",1);
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ffe_results = ffe(eq_ffe,M,Rx_synced,Symbols,Bits, ...
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"precode_mode",duob_mode,'showAnalysis',0,"postFFE",[], ...
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"eth_style_symbol_mapping",mapping_style);
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% ffe_results.metrics.print
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fprintf('My EQ: %.1e \n',ffe_results.metrics.BER);
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fprintf('Paper: %.1e \n \n',ber_in_paper);
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%% -------------------- VNLE + MLSE --------------------
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pf_ncoeffs = 1;
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eq_v = EQ("Ne",[100, 5, 5],"Nb",[0, 0, 0], ...
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"training_length",len_tr,"training_loops",5,"dd_loops",5, ...
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"K",2,"DCmu",mu_dc,"DDmu",[mu_ffe mu_dfe],"DFEmu",0.005, ...
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"FFEmu",0,"plotfinal",0,"ideal_dfe",1);
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pf_ = Postfilter("ncoeff",pf_ncoeffs,"useBurg",1);
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mlse_ = MLSE("duobinary_output",0,'M',M,'trellis_states',PAMmapper(M,0,"eth_style",mapping_style).levels);
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[vnle_results, mlse_results] = vnle_postfilter_mlse(eq_v, pf_, mlse_, M, Rx_synced, Symbols, Bits, ...
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"precode_mode", duob_mode, 'showAnalysis', 1, "postFFE", [], "eth_style_symbol_mapping", mapping_style);
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mlse_results.metrics.print
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fprintf('My EQ: %.1e \n',mlse_results.metrics.BER);
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fprintf('Paper: %.1e \n \n',ber_in_paper);
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