Added testbench for simulink model. Added f0 option to both testbenches

frft_codegen/TBc_lfm_fracF.m

@@ -17,14 +17,17 @@ betas = (-32e12 : 8e12 : 32e12);
 % Order sweep (for heatmap)
 a_vec = linspace( 0.5,  1.5, 100);
 
+% Center frequency 
+f0 = 0e6;   % center frequency (Hz) — set as needed
+
 %% ============================================================
 %% A) HEATMAP (single chirp, order sweep)
 %% ============================================================
 
-beta0 = 8e12; % pick one chirp for visualization
+beta0 = 64e12; % pick one chirp for visualization
 
 % Generate LFM chirp
-x = exp(1j*pi*beta0*t.^2);
+x = exp(1j*(2*pi*f0*t + pi*beta0*t.^2));
 
 % External interpolation (IMPORTANT)
 x_interp = bizinter(x);
@@ -59,7 +62,7 @@ fprintf('Global relative error: %.3e\n', rel_err_global);
 
 % Plot - Reference
 figure;
-imagesc(a_vec, 1:N_out, abs(FrFT_map_ref) / sqrt(N));
+imagesc(a_vec, -N_out/2:N_out/2-1, abs(FrFT_map_ref) / sqrt(N));
 axis xy;
 xlabel('Order a');
 ylabel('Index');
@@ -68,7 +71,7 @@ colorbar;
 
 % Plot - Comparison
 figure;
-imagesc(a_vec, 1:N_out, abs(FrFT_map_cmp) / sqrt(N));
+imagesc(a_vec, -N_out/2:N_out/2-1, abs(FrFT_map_cmp) / sqrt(N));
 axis xy;
 xlabel('Order a');
 ylabel('Index');
@@ -80,7 +83,7 @@ figure;
 rel_err_map = abs(FrFT_map_ref - FrFT_map_cmp) ./ ...
               (abs(FrFT_map_ref) + eps);
 
-imagesc(a_vec, 1:N_out, rel_err_map);
+imagesc(a_vec, -N_out/2:N_out/2-1, rel_err_map);
 axis xy;
 xlabel('Order a');
 ylabel('Index');
@@ -99,7 +102,7 @@ for i = 1:length(betas)
     beta = betas(i);
 
     % Generate chirp
-    x = exp(1j*pi*beta*t.^2);
+    x = exp(1j*(2*pi*f0*t + pi*beta*t.^2));
 
     % External interpolation
     x_interp = bizinter(x);

resources/project/9lwM0dX3iyjMhadwFjZ2rmFpFrE/-0MWWyNCymyr6e2d1GJ78tZujaop.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Info location="TBc_lfm_fracF.m" type="File"/>

resources/project/9lwM0dX3iyjMhadwFjZ2rmFpFrE/eTmM9m3sr_NNL3DqkLhxz5MFILYp.xml

@@ -1,2 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Info location="frft_tb_lfm.m" type="File"/>

resources/project/9lwM0dX3iyjMhadwFjZ2rmFpFrE/lEvBB9BKU7fXtCU8lQ5TWus1ILEd.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Info>
+    <Category UUID="FileClassCategory">
+        <Label UUID="design"/>
+    </Category>
+</Info>

resources/project/9lwM0dX3iyjMhadwFjZ2rmFpFrE/lEvBB9BKU7fXtCU8lQ5TWus1ILEp.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Info location="TBm_lfm_fracF.slx" type="File"/>