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Working from home on zürich DSP.

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silas (home)
2025-03-10 08:56:17 +01:00
parent affdb4ad6f
commit bc86fa8d98
22 changed files with 459 additions and 137 deletions
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19
Functions/EQ_structures/duobinary_target.m
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@@ -9,6 +9,7 @@ arguments
tx_bits
options.precode_mode db_mode
options.showAnalysis = 0;
options.eth_style_symbol_mapping = 0;
end
%Duobinary Targeting
@@ -18,7 +19,7 @@ end
% dir = [1,1];
mlse_sig_sd = mlse_.process(eq_signal);
mlse_sig_hd = PAMmapper(M,0).quantize(mlse_sig_sd);
mlse_sig_hd = PAMmapper(M,0,"eth_style",options.eth_style_symbol_mapping).quantize(mlse_sig_sd);
% precoding to mitigate error propagation, most prominently used in
% combination with duobinary signaling to avoid catastrophic error
@@ -37,12 +38,12 @@ end
tx_symbols_precoded = Duobinary().encode(tx_symbols);
tx_symbols_precoded = Duobinary().decode(tx_symbols_precoded);
tx_bits = PAMmapper(M,0).demap(tx_symbols_precoded);
tx_bits = PAMmapper(M,0,"eth_style",options.eth_style_symbol_mapping).demap(tx_symbols_precoded);
case db_mode.db_discard
% normal dsp for precoded sequence == discard/omit/ignore precode
tx_bits = PAMmapper(M,0).demap(tx_symbols);
tx_bits = PAMmapper(M,0,"eth_style",options.eth_style_symbol_mapping).demap(tx_symbols);
case db_mode.db_encoded
@@ -56,7 +57,7 @@ end
end
% M = numel(unique(tx_symbols.signal));
rx_bits = PAMmapper(M,0).demap(mlse_sig_hd);
rx_bits = PAMmapper(M,0,"eth_style",options.eth_style_symbol_mapping).demap(mlse_sig_hd);
[~,numErrors,ber,~] = calc_ber(rx_bits.signal,tx_bits.signal,"skip_front",100,"skip_end",150,"returnErrorLocation",1);
@@ -66,11 +67,15 @@ end
if options.showAnalysis
eq_noise = eq_noise - mean(eq_noise.signal);
rx_signal.spectrum("normalizeTo0dB",1,"fignum",250);
rx_signal.spectrum("normalizeTo0dB",1,"fignum",250,"displayname","Rx Spectrum");
showEQNoisePSD(eq_noise,"fignum",250,"displayname",'Duobinary Target Noise');
Duobinary().encode(tx_symbols).spectrum("normalizeTo0dB",1,"fignum",250,"displayname","DB encoded reference");
Duobinary().encode(tx_symbols).spectrum("normalizeTo0dB",1,"fignum",250);
showEQNoisePSD(eq_noise,"fignum",250,"displayname",'Duobinary Target Noise after Equalization');
fprintf('DB tgt BER: %.2e \n',ber);
end