+++ 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)

Classes/03_electrical/CTLE.m

@@ -0,0 +1,82 @@
+classdef CTLE < handle
+
+    properties(Access=public)
+        Aac_dB
+        Adc_dB
+        f_p1
+        f_p2
+        plot
+    end
+
+    methods(Access=public)
+        function obj = CTLE(options)
+            arguments
+                options.Aac_dB = 0;
+                options.Adc_dB = -6;
+                options.f_p1 = 1.5e9;
+                options.f_p2 = 5e9;
+                options.plot = 0;
+            end
+
+            fn = fieldnames(options);
+            for n = 1:numel(fn)
+                obj.(fn{n}) = options.(fn{n});
+            end
+
+        end
+
+        function data_out = process(obj, data_in)
+
+            x  = data_in.signal(:);
+            Fs = data_in.fs;
+            N  = length(x);
+
+            % CTLE Transfer Function Parameters
+            A_ac = 10^(obj.Aac_dB/20);
+            A_dc = 10^(obj.Adc_dB/20);
+            w1   = 2*pi*obj.f_p1;
+            w2   = 2*pi*obj.f_p2;
+
+            % Frequency Domain Conversion
+            X = fft(x);
+
+            % Generating Frequency Axis In The Range Of [-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;
+            f_pos = abs(f_signed);
+            w_pos = 2*pi*f_pos;
+            s_pos = 1j*w_pos;
+
+            % Calculate CTLE Transfer Function
+            H_pos = A_ac*w2 .* (s_pos + (A_dc/A_ac)*w1) ./ ((s_pos + w1).*(s_pos + w2));
+
+            % Enforce H(-f) = conj(H(f)) For Negative Bins
+            H = H_pos;
+            H(idxNeg) = conj(H_pos(idxNeg));
+
+            % Apply CTLE
+            Y = H .* X;
+
+            % Calculate Time Domain Signal
+            y = ifft(Y, 'symmetric');
+            data_out = data_in;
+            data_out.signal = y;
+            data_out.fs = Fs;
+
+            % Plot
+            if obj.plot
+                % plot only positive frequencies up to Fs/2
+                k = 1:floor(N/2)+1;
+                fplot = f_fft(k);
+                Hplot = H(k);
+
+                figure;
+                semilogx(fplot, 20*log10(abs(Hplot)+1e-15));
+                grid on; xlabel('frequency (Hz)'); ylabel('magnitude (dB)');
+                title('CTLE magnitude on FFT grid');
+            end
+        end
+    end
+end