+++ Changes +++

+ duobinary_target now supports memoryless decoding (FFE targets DB response without MLSE) + PAMmapper.quantize now supports custom constellations for quantization + Added a new folder 'Documentations' for pdfs, slides, etc. + Added new FSO evaluation scripts in projects/FSO transmission/Evaluation Scripts + Added ffe_db (rudimentary module, not important anymore)
2026-03-05 10:41:21 +01:00
parent 2a724b833f
commit 3676d92b30
32 changed files with 2307 additions and 232 deletions
--- a/Classes/03_electrical/Electrical_Trace_BiDi.m
+++ b/Classes/03_electrical/Electrical_Trace_BiDi.m
@@ -0,0 +1,114 @@
+classdef Electrical_Trace_BiDi < handle
+
+    properties(Access=public)
+        file_path
+        fsym
+        rolloff
+        K_over
+        plot
+        test
+        S_test
+    end
+
+    methods(Access=public)
+        function obj = Electrical_Trace_BiDi(options)
+            arguments(Input)
+
+                options.file_path = 'C:\Users\magf\Desktop\Desktop\MATLAB-Zeugs\COM Test\Mellitzz\TA_6002_6003_FX_B6_C6_B7_C7_Terminated.s4p'
+                options.fsym = 0;
+                options.rolloff = 0;
+                options.K_over = 1;
+                options.plot = 0;
+                options.test = 0;
+                options.S_test = [0,1;1,0];
+            end
+
+            fn = fieldnames(options);
+            for n = 1:numel(fn)
+                obj.(fn{n}) = options.(fn{n});
+            end
+
+ 
+
+        end
+
+        function [b_1,b_2] = process(obj, a_1, a_2)
+
+            % Rx Signal Calculation Using S-Paramters For a 2-Port Network
+            % [B_1(f); B_2(f)] = [S_11(f), S_12(f); S_21(f), S_22(f)] * [A_1(f); A_2(f)]
+
+            % Initialize Rx Time Domain Signals
+            b_1 = a_2;
+            b_2 = a_1;
+
+            % Loading and Extract S-Paramters
+            net = sparameters(obj.file_path);
+            f_s = net.Frequencies(:);
+
+            if ~obj.test
+                S2  = net.Parameters(1:2, 1:2, :);
+            else
+                S2 = repmat(obj.S_test,1,1,size(f_s,1));
+            end
+            
+            S11_s = squeeze(S2(1,1,:));
+            S12_s = squeeze(S2(1,2,:));
+            S21_s = squeeze(S2(2,1,:));
+            S22_s = squeeze(S2(2,2,:));
+
+            % Setup Time Domain Signals
+            x1 = a_1.signal(:);
+            x2 = a_2.signal(:);
+            N  = length(x1);
+            assert(length(x2)==N, 'a_1 and a_2 must have same length');
+
+            % Extract Time Domain Signal Frequencies
+            if obj.fsym == 0 && obj.rolloff == 0 && obj.K_over == 1
+                Fs = a_1.fs;
+            else
+                Fs = (1+obj.rolloff)*obj.fsym;
+            end
+            
+            % Calculate Frequency Domain Signals
+            A1 = fft(x1);
+            A2 = fft(x2);
+            
+            % Calculate Frequency Axis [-Fs/2,...,Fs/2]
+            f_fft = (0:N-1).' * (Fs/N);
+            f_signed = f_fft;
+            idxNeg = f_signed > Fs/2;
+            f_signed(idxNeg) = f_signed(idxNeg) - Fs;      % Now in (-Fs/2, Fs/2]
+            
+            % Absolute Value Used for Interpolation
+            f_pos = abs(f_signed);
+            
+            % Interpolate S-Parameters onto f_pos
+            S11_p = interp1(f_s, S11_s, f_pos, 'linear', 'extrap');
+            S12_p = interp1(f_s, S12_s, f_pos, 'linear', 'extrap');
+            S21_p = interp1(f_s, S21_s, f_pos, 'linear', 'extrap');
+            S22_p = interp1(f_s, S22_s, f_pos, 'linear', 'extrap');
+            
+            % Apply Hermitian Symmetry: S(-f) = conj(S(f))
+            S11 = S11_p; S12 = S12_p; S21 = S21_p; S22 = S22_p;
+            S11(idxNeg) = conj(S11_p(idxNeg));
+            S12(idxNeg) = conj(S12_p(idxNeg));
+            S21(idxNeg) = conj(S21_p(idxNeg));
+            S22(idxNeg) = conj(S22_p(idxNeg));
+            
+            % Compute Rx Frequency Domain Signals
+            B1 = S11 .* A1 + S12 .* A2;
+            B2 = S21 .* A1 + S22 .* A2;
+            
+            % Calculate Rx Time Domain Signals
+            b_1.signal = ifft(B1, 'symmetric');
+            b_2.signal = ifft(B2, 'symmetric');
+
+            if obj.plot
+                rfplot(net)
+            end
+
+
+        end
+    end
+end
+