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This commit is contained in:
Silas Oettinghaus
2025-02-14 14:54:03 +01:00
parent 2be1254611
commit becaf3f6c9
26 changed files with 1507 additions and 1052 deletions
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82
Functions/EQ_structures/vnle.m
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@@ -1,4 +1,4 @@
function [eq_signal,eq_noise,ber,numErrors] = vnle(EQ,M,rx_signal,tx_symbols,tx_bits,emulate_precode)
function [eq_package] = vnle(eq_,M,rx_signal,tx_symbols,tx_bits,options)
%VNLE Apply an equalization algorithm to the received signal and calculate BER
% This function takes an equalizer object, a received signal, and the
% transmitted symbols to apply equalization, map the received signal back to bits,
@@ -14,23 +14,73 @@ function [eq_signal,eq_noise,ber,numErrors] = vnle(EQ,M,rx_signal,tx_symbols,tx_
% ber - Bit error rate after equalization
% numErrors - Number of bit errors detected
%FFE or VNLE
[eq_signal,eq_noise] = EQ.process(rx_signal,tx_symbols);
eq_signal = PAMmapper(M,0).quantize(eq_signal);
if emulate_precode
eq_signal = Duobinary().encode(eq_signal);
eq_signal = Duobinary().decode(eq_signal);
tx_symbols= Duobinary().encode(tx_symbols);
tx_symbols = Duobinary().decode(tx_symbols);
tx_bits = PAMmapper(M,0).demap(tx_symbols);
arguments
eq_
M
rx_signal
tx_symbols
tx_bits
options.precode_mode db_mode
options.showAnalysis = 0
end
% M = numel(unique(tx_symbols.signal));
rx_bits = PAMmapper(M,0).demap(eq_signal);
%FFE or VNLE
[eq_signal_sd,eq_noise] = eq_.process(rx_signal,tx_symbols);
eq_signal_hd = PAMmapper(M,0).quantize(eq_signal_sd);
% precoding to mitigate error propagation, most prominently used in
% combination with duobinary signaling to avoid catastrophic error
% behavior (see J.W.M. Bergmans, Digital Baseband Transmission and Recording -> partial response signaling)
% takes:
% -> eq_signal_hd: hard decision signal after eq
% -> tx_symbols: that where used as reference for eq
switch options.precode_mode
case db_mode.db_emulate
% re
eq_signal_hd = Duobinary().encode(eq_signal_hd,"M",M);
eq_signal_hd = Duobinary().decode(eq_signal_hd,"M",M);
tx_symbols_precoded = Duobinary().encode(tx_symbols);
tx_symbols_precoded = Duobinary().decode(tx_symbols_precoded);
tx_bits = PAMmapper(M,0).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);
case db_mode.db_encoded
% normal DB encoded data (only for 10KM)
case db_mode.db_precoded
eq_signal_hd = Duobinary().encode(eq_signal_hd,"M",M);
eq_signal_hd = Duobinary().decode(eq_signal_hd,"M",M);
end
rx_bits = PAMmapper(M,0).demap(eq_signal_hd);
[~,numErrors,ber,~] = calc_ber(rx_bits.signal,tx_bits.signal,"skip_front",100,"skip_end",150,"returnErrorLocation",1);
[evm_total,evm_lvl] = calc_evm(eq_signal_sd,tx_symbols);
[inf_rate] = calc_air(eq_signal_sd,tx_symbols,"skip_front",10000,"skip_end",10000);
eq_package.ber_vnle = ber;
eq_package.evm_total = evm_total;
eq_package.evm_lvl = evm_lvl;
eq_package.inf_rate_vnle = inf_rate;
if options.showAnalysis
fprintf(['VNLE EVM lvl: ',repmat('%.3f ',1,numel(evm_lvl)),' \n'],evm_lvl);
fprintf('VNLE BER: %.2e \n',ber);
end
end