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This commit is contained in:
Silas Labor Zizou
2024-10-10 11:07:59 +02:00
parent 285fca45eb
commit 6b0f9de118
21 changed files with 901 additions and 100 deletions
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24
Classes/04_DSP/Equalizer/FFE_adaptive_decision.m
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@@ -82,7 +82,7 @@ classdef FFE_adaptive_decision < handle
end
X.fs = D.fs; %change sampling frequency of outgoing signal from fdac e.g. 2 sps to symbol spaced = fsym
lbdesc = [num2str(obj.order),' tap FFE'];
X = X.logbookentry(lbdesc); % append to logbook
X = X.logbookentry(lbdesc,obj); % append to logbook
end
@@ -106,6 +106,8 @@ classdef FFE_adaptive_decision < handle
symbol = 0;
% y_buffer = zeros(numel(obj.constellation),500);
y_buffer = repmat(obj.constellation,1,obj.buffer_length);
adap_constellation = zeros(length(obj.constellation),length(x));
cnt=0;
for sample = 1 : obj.sps : N
symbol = symbol+1;
@@ -119,16 +121,24 @@ classdef FFE_adaptive_decision < handle
d_hat(symbol,1) = d(symbol);
else
y_buffer(y_buffer==0) = NaN;
adap_constellation = mean(y_buffer,2,"omitnan");
[~,symbol_idx] = min(abs(y(symbol) - adap_constellation)); % decision for closest constellation point
adap_constellation(:,symbol) = mean(y_buffer,2,"omitnan");
[~,symbol_idx] = min(abs(y(symbol) - adap_constellation(:,symbol))); % decision for closest constellation point
d_hat(symbol,1) = obj.constellation(symbol_idx);
end
y_buffer(symbol_idx,1) = y(symbol);
y_buffer(symbol_idx,:) = circshift(y_buffer(symbol_idx,:),1);
%y_(symbol) = y(symbol) - (adap_constellation(symbol_idx,symbol)-d_hat(symbol,1));
err(symbol) = y(symbol) - d_hat(symbol); % Instantaneous error
if training
err(symbol) = y(symbol) - d_hat(symbol); % Instantaneous error
else
err(symbol) = y(symbol) - d_hat(symbol); % Instantaneous error
end
if mio ~= 0
obj.e = obj.e - (mio * err(symbol) * U) ; % Weight update rule of LMS
@@ -136,13 +146,13 @@ classdef FFE_adaptive_decision < handle
normalizationfactor = (U.' * U);
obj.e = obj.e - err(symbol) * U / normalizationfactor; % Weight update rule of NLMS
end
obj.error(epoch,symbol) = err(symbol) * err(symbol)'; % Instantaneous square error
end
end
%figure(1234);scatter(1:length(d_hat),y,1,'.');hold on;scatter(1:length(d_hat),y_,1,'.');plot(adap_constellation(1,1:length(d_hat)));plot(adap_constellation(2,1:length(d_hat)));plot(adap_constellation(3,1:length(d_hat)));plot(adap_constellation(4,1:length(d_hat)))
end
end