Added frft functions towards codegen (c code on PS)
This commit is contained in:
37
frft_codegen/bizinter.m
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37
frft_codegen/bizinter.m
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function xint=bizinter(x)
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N=length(x);
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im = 0;
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if sum(abs(imag(x)))>0
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im = 1;
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imx = imag(x);
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x = real(x);
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end
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x2=x(:);
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x2=[x2.'; zeros(1,N)];
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x2=x2(:);
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xf=fft(x2);
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if rem(N,2)==1 %N = odd
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N1=fix(N/2+1); N2=2*N-fix(N/2)+1;
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xint=2*real(ifft([xf(1:N1); zeros(N,1) ;xf(N2:2*N)].'));
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else
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xint=2*real(ifft([xf(1:N/2); zeros(N,1) ;xf(2*N-N/2+1:2*N)].'));
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end
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if ( im == 1)
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x2=imx(:);
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x2=[x2.'; zeros(1,N)];
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x2=x2(:);
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xf=fft(x2);
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if rem(N,2)==1 %N = odd
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N1=fix(N/2+1); N2=2*N-fix(N/2)+1;
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xmint=2*real(ifft([xf(1:N1); zeros(N,1) ;xf(N2:2*N)].'));
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else
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xmint=2*real(ifft([xf(1:N/2); zeros(N,1) ;xf(2*N-N/2+1:2*N)].'));
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end
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xint = xint + 1j*xmint;
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end
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xint = xint(:);
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end
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80
frft_codegen/fracF_cg.m
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80
frft_codegen/fracF_cg.m
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function F = fracF_cg(f, a)
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%#codegen
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%% fracF_cg Fractional Fourier Transform (FrFT) - codegen-ready version
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%
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% Author: Canisio Barth
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%
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% F = fracF_cg(f, a) computes the Fractional Fourier Transform (FrFT)
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% of the input signal 'f' for a single transform order 'a'.
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%
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% This version is adapted for MATLAB Coder and hardware-oriented workflows.
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%
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% Key characteristics:
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% - Fixed input size: [1024 x 1] complex(single)
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% - Output size: [512 x 1] complex(single)
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% - Assumes input 'f' is already interpolated externally
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% - No input validation (assumes valid scalar 'a' in core region)
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% - Deterministic execution (no branching, no dynamic allocation)
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%
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% INPUTS:
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% f - [1024 x 1] complex(single)
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% a - scalar single
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%
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% OUTPUTS:
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% F - [512 x 1] complex(single)
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%
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% Notes:
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% - Internal FFT size = 2048
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% - Designed for code generation and future FPGA mapping
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% Fixed sizes
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N = 1024;
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%N2 = 512;
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Nfft = 2048;
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% Ensure types
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pi_s = single(pi);
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% Transform parameter
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phi = a * (pi_s / 2);
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% Precompute trig terms
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tan_half_phi = tan(phi / 2);
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sin_phi = sin(phi);
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cos_phi = cos(phi);
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csc_phi = 1 / sin_phi;
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cot_phi = cos_phi / sin_phi;
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twoDelta = 2 * sqrt(single(N) / 2);
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%% === Chirp A ===
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n = single((-N/2:N/2-1).') / twoDelta;
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Achirp = exp(-1j * pi_s * (n .* n) * tan_half_phi);
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%% Chirp multiplication #1
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g = Achirp .* f;
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%% === Chirp B ===
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m = single((-N:N-1).') / twoDelta;
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Bchirp = exp(1j * pi_s * csc_phi .* (m .* m));
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%% === Zero-padded buffer ===
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g_pad = complex(zeros(Nfft,1,'single'));
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g_pad(1:N) = g;
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%% === FFT convolution ===
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G = ifft( fft(g_pad) .* fft(Bchirp) );
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%% Extract valid part and decimate
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G_valid = G(N+1:2:end); % [512 x 1]
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%% Complex phase constant
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Aphi = sqrt(1 - 1j * cot_phi);
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%% === Chirp multiplication #2 ===
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F = (Aphi / twoDelta) .* G_valid .* Achirp(1:2:end);
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end
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77
frft_codegen/fracF_ref.m
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77
frft_codegen/fracF_ref.m
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@@ -0,0 +1,77 @@
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function [F] = fracF_ref(f, a)
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%% fracF_ref Reference Fractional Fourier Transform (FrFT) implementation
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%
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% Author: Canisio Barth
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%
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% F = fracF_ref(f, a) computes the Fractional Fourier Transform (FrFT)
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% of the input signal 'f' for a single transform order 'a'.
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%
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% This function serves as a reference (golden model) for validation and
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% comparison against future code generation and hardware-oriented
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% implementations.
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%
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% Key characteristics:
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% - Scalar transform order 'a' (no vector support).
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% - Assumes input signal 'f' is already interpolated externally.
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% - Maintains original algorithm structure, including internal
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% decimation after convolution.
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% - Uses full MATLAB flexibility (not yet restricted for codegen).
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%
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% INPUTS:
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% f - Input signal, [N x 1] column vector.
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% IMPORTANT: 'f' must already be interpolated (expanded signal).
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%
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% a - Scalar transform order.
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% Expected to satisfy: 0.5 < |a| < 1.5
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%
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% OUTPUTS:
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% F - Fractional Fourier Transform, [(N/2) x 1] column vector.
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% (Decimated output, consistent with original algorithm.)
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%
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% LIMITATIONS:
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% - No internal interpolation is performed.
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% - Only valid for scalar 'a'.
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% - Assumes caller enforces correct parameter range and signal format.
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%
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% See also: fracF (Ozaktas)
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% Validate scalar 'a'
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if ~isscalar(a)
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error('Parameter ''a'' must be scalar.');
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end
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% Range check (core region)
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if abs(a) < 0.5 || abs(a) > 1.5
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error('Parameter ''a'' must be within the interval [0.5, 1.5].');
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end
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N = length(f); % already interpolated length
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% Transform parameter
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twoDelta = 2 * sqrt(N/2);
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phi = a * pi / 2;
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% === Chirp A ===
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n = ((-N/2:N/2-1) / twoDelta).';
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Achirp = exp(-1j * pi * (n .* n) * tan(phi/2));
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% Chirp multiplication #1
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g = Achirp .* f;
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% === Chirp B ===
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m = ((-N:N-1) / twoDelta).';
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Bchirp = exp(1j * pi * csc(phi) .* (m .* m));
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% === Chirp convolution ===
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G = ifft(fft([g; zeros(N,1)]) .* fft(Bchirp));
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% Extract valid part and decimate
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G = G(end/2+1:2:end);
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% Complex phase constant
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Aphi = sqrt(1 - 1j * cot(phi));
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% === Chirp multiplication #2 ===
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F = (Aphi / twoDelta) .* G .* Achirp(1:2:end);
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end
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128
frft_codegen/frft_tb_lfm.m
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128
frft_codegen/frft_tb_lfm.m
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@@ -0,0 +1,128 @@
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%% FrFT Validation Script (Reference vs Original)
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% Author: Canisio Barth
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clear; clc; close all;
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%% Parameters
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Fs = 512e6; % Sampling rate
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T = 1e-6; % Signal duration
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N = Fs*T; % 512 samples
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n = (0:N-1).';
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t = (n - N/2)/ Fs;
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% Beta range (Hz/s)
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betas = (-32e12 : 8e12 : 32e12);
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% Order sweep (for heatmap)
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a_vec = linspace( 0.5, 1.5, 100);
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%% ============================================================
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%% A) HEATMAP (single chirp, order sweep)
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%% ============================================================
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beta0 = 16e12; % pick one chirp for visualization
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% Generate LFM chirp
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x = exp(1j*pi*beta0*t.^2);
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% External interpolation (IMPORTANT)
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x_interp = bizinter(x);
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N_interp = length(x_interp);
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N_out = N_interp/2; % after decimation
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% Allocate
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FrFT_map_ref = zeros(N_out, length(a_vec));
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FrFT_map_cmp = zeros(N_out, length(a_vec));
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for k = 1:length(a_vec)
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a = a_vec(k);
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% Reference
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y_ref = fracF_ref(x_interp, a);
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% Comparison (original / other implementation)
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y_cmp = fracF_cg(x_interp, a);
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FrFT_map_ref(:,k) = y_ref;
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FrFT_map_cmp(:,k) = y_cmp;
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end
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% Plot - Reference
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figure;
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imagesc(a_vec, 1:N_out, abs(FrFT_map_ref) / sqrt(N));
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axis xy;
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xlabel('Order a');
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ylabel('Index');
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title('FrFT Magnitude (Reference)');
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colorbar;
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% Plot - Comparison
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figure;
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imagesc(a_vec, 1:N_out, abs(FrFT_map_cmp) / sqrt(N));
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axis xy;
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xlabel('Order a');
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ylabel('Index');
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title('FrFT Magnitude (Comparison)');
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colorbar;
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% Plot - Difference
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figure;
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rel_err_map = abs(FrFT_map_ref - FrFT_map_cmp) ./ ...
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(abs(FrFT_map_ref) + eps);
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imagesc(a_vec, 1:N_out, rel_err_map);
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axis xy;
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xlabel('Order a');
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ylabel('Index');
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title('Absolute Difference |Ref - Cmp|');
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colorbar;
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%% ============================================================
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%% B) PEAK VS BETA (matched order)
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%% ============================================================
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peak_ref = zeros(size(betas));
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peak_cmp = zeros(size(betas));
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for i = 1:length(betas)
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beta = betas(i);
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% Generate chirp
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x = exp(1j*pi*beta*t.^2);
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% External interpolation
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x_interp = bizinter(x);
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% Matched order
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a = -(2/pi)*atan(Fs/(beta*T));
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% Compute FrFT
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y_ref = fracF_ref(x_interp, a);
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y_cmp = fracF_cg(x_interp, a);
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% Normalized peak magnitude
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peak_ref(i) = max(abs(y_ref)) / sqrt(N);
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peak_cmp(i) = max(abs(y_cmp)) / sqrt(N);
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end
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% Plot peaks
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figure;
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plot(betas/1e12, peak_ref, 'o-', 'LineWidth', 1.5); hold on;
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plot(betas/1e12, peak_cmp, 's--', 'LineWidth', 1.5);
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xlabel('\beta (MHz/\mus)');
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ylabel('Peak Magnitude');
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title('Peak vs Chirp Rate');
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legend('Reference','Comparison');
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grid on;
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% Plot relative error
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figure;
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rel_err = abs(peak_ref - peak_cmp) ./ peak_ref;
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plot(betas/1e12, rel_err, 'o-', 'LineWidth', 1.5);
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xlabel('\beta (MHz/\mus)');
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ylabel('Relative Error');
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title('Relative Error between Implementations');
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grid on;
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@@ -0,0 +1,2 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<Info/>
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@@ -0,0 +1,2 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="EMLReport" type="File"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="1" type="DIR_SIGNIFIER"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="1" type="DIR_SIGNIFIER"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info>
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<Category UUID="FileClassCategory">
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<Label UUID="design"/>
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</Category>
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</Info>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="fracF_cg.m" type="File"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info/>
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@@ -0,0 +1,2 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="1" type="DIR_SIGNIFIER"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info>
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<Category UUID="FileClassCategory">
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<Label UUID="design"/>
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</Category>
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</Info>
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@@ -0,0 +1,2 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="frft_tb_lfm.m" type="File"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info>
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<Category UUID="FileClassCategory">
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<Label UUID="design"/>
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</Category>
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</Info>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="bizinter.m" type="File"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info>
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<Category UUID="FileClassCategory">
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<Label UUID="design"/>
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</Category>
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</Info>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="fracF_ref.m" type="File"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="slprj" type="File"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="1" type="DIR_SIGNIFIER"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info>
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<Category UUID="FileClassCategory">
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<Label UUID="derived"/>
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</Category>
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</Info>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="simulink_cache.xml" type="File"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info>
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<Category UUID="FileClassCategory">
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<Label UUID="derived"/>
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</Category>
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</Info>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="checksumOfCache.mat" type="File"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info>
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<Category UUID="FileClassCategory">
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<Label UUID="derived"/>
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</Category>
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</Info>
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@@ -0,0 +1,2 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="varInfo.mat" type="File"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="1" type="DIR_SIGNIFIER"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info/>
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@@ -0,0 +1,2 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="tmwinternal" type="File"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info/>
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@@ -0,0 +1,2 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="1" type="DIR_SIGNIFIER"/>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info>
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<Category UUID="FileClassCategory">
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<Label UUID="derived"/>
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</Category>
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</Info>
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<?xml version="1.0" encoding="UTF-8"?>
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<Info location="varInfo.mat" type="File"/>
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|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="tmwinternal" type="File"/>
|
||||
@@ -0,0 +1,6 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info>
|
||||
<Category UUID="FileClassCategory">
|
||||
<Label UUID="derived"/>
|
||||
</Category>
|
||||
</Info>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="checksumOfCache.mat" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="tmwinternal" type="File"/>
|
||||
@@ -0,0 +1,6 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info>
|
||||
<Category UUID="FileClassCategory">
|
||||
<Label UUID="derived"/>
|
||||
</Category>
|
||||
</Info>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="varInfo.mat" type="File"/>
|
||||
@@ -0,0 +1,6 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info>
|
||||
<Category UUID="FileClassCategory">
|
||||
<Label UUID="derived"/>
|
||||
</Category>
|
||||
</Info>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="checksumOfCache.mat" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="1" type="DIR_SIGNIFIER"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="1" type="DIR_SIGNIFIER"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="soc_rfsoc_top" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="soc_rfsoc_proc" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="soc_rfsoc_fpga" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="1" type="DIR_SIGNIFIER"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="varcache" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="1" type="DIR_SIGNIFIER"/>
|
||||
@@ -0,0 +1,6 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info>
|
||||
<Category UUID="FileClassCategory">
|
||||
<Label UUID="derived"/>
|
||||
</Category>
|
||||
</Info>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="simulink_cache.xml" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="1" type="DIR_SIGNIFIER"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="sgVlodvHNWTJpNumJC5wh5" type="File"/>
|
||||
@@ -0,0 +1,6 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info>
|
||||
<Category UUID="FileClassCategory">
|
||||
<Label UUID="derived"/>
|
||||
</Category>
|
||||
</Info>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="sQsFSRLFrOBlBZCS5JfzO6E.mat" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="1" type="DIR_SIGNIFIER"/>
|
||||
@@ -0,0 +1,6 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info>
|
||||
<Category UUID="FileClassCategory">
|
||||
<Label UUID="derived"/>
|
||||
</Category>
|
||||
</Info>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="sgVlodvHNWTJpNumJC5wh5.mat" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="sQsFSRLFrOBlBZCS5JfzO6E" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="frft_codegen" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="_sfprj" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="1" type="DIR_SIGNIFIER"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="sim" type="File"/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info/>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="1" type="DIR_SIGNIFIER"/>
|
||||
@@ -0,0 +1,6 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info>
|
||||
<Category UUID="FileClassCategory">
|
||||
<Label UUID="derived"/>
|
||||
</Category>
|
||||
</Info>
|
||||
@@ -0,0 +1,2 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<Info location="simulink_cache.xml" type="File"/>
|
||||
Reference in New Issue
Block a user