Initial ARSS. Need to improve and add functions.

2026-03-02 14:48:21 +09:00
commit 775668afdb
20 changed files with 1610 additions and 0 deletions
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+function phi_noise = generate_phase_noise_from_datasheet(t, phaseNoiseCfg)
+% DATASHEET 기반 SSB phase noise(dBc/Hz) 마스크로 시간영역 위상잡음(rad) 생성
+% 입력:
+%   t            : 시간 벡터 [1xN] 또는 [Nx1] (초)
+%   phaseNoiseCfg.offset_Hz    : 오프셋 주파수 벡터(Hz)
+%   phaseNoiseCfg.level_dBc_Hz : 각 오프셋에서의 SSB phase noise (dBc/Hz)
+% 출력:
+%   phi_noise    : 시간영역 위상잡음 [1xN] (rad)
+
+    t = t(:);
+    N = numel(t);
+    phi_noise = zeros(1, N);
+    if N < 2
+        return;
+    end
+
+    dt = mean(diff(t));
+    fs = 1 / dt;
+    df = fs / N;
+
+    offsets = phaseNoiseCfg.offset_Hz(:);
+    levels_dBc = phaseNoiseCfg.level_dBc_Hz(:);
+
+    valid = isfinite(offsets) & isfinite(levels_dBc) & offsets > 0;
+    offsets = offsets(valid);
+    levels_dBc = levels_dBc(valid);
+    if isempty(offsets)
+        return;
+    end
+
+    [offsets, order] = sort(offsets, 'ascend');
+    levels_dBc = levels_dBc(order);
+
+    f_pos = (1:floor(N/2))' * df;
+    if isempty(f_pos)
+        return;
+    end
+
+    if numel(offsets) == 1
+        L_dBc = levels_dBc(1) * ones(size(f_pos));
+    else
+        L_dBc = interp1(log10(offsets), levels_dBc, log10(f_pos), 'linear', 'extrap');
+    end
+
+    % SSB phase noise L(f) 와 위상 PSD 관계: L(f) ~= 0.5 * S_phi(f)
+    % => S_phi(f) ~= 2 * 10^(L(f)/10) [rad^2/Hz]
+    S_phi = 2 * 10.^(L_dBc / 10);
+
+    % 협대역 랜덤 사인 성분 합성
+    amp = sqrt(2 * S_phi * df); % 각 톤 진폭(rad)
+    rand_phase = 2 * pi * rand(size(f_pos));
+
+    t_rel = t - t(1);
+    % NxK 행렬 계산
+    phase_matrix = 2*pi*(t_rel * f_pos.') + rand_phase.';
+    phi_noise = (cos(phase_matrix) * amp).';
+    phi_noise = phi_noise(:).';
+end