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Many changes in DBHandler

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new general processing structure
just before splitting off the projects folder from this repo
This commit is contained in:
Silas Oettinghaus
2025-05-13 10:24:09 +02:00
parent 727c3d9364
commit 9ce23c4a10
38 changed files with 2440 additions and 1103 deletions
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54
Functions/Metrics/calc_std.m
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@@ -25,34 +25,46 @@ end
[test_signal,reference_signal]=trimseq(test_signal,reference_signal,options.skip_front,options.skip_end);
% CALC EVM
[std_total,std_lvl] = calc_std_(test_signal,reference_signal);
[std_total, std_lvl, nsd_lvl, d_min]= calc_std_(test_signal,reference_signal);
std_lvl = nsd_lvl;
function [std_total, std_lvl, nsd_lvl, d_min] = calc_std_(test_signal, reference_signal)
% NSD (Normalized Standard Deviation) expresses the noise spread at each symbol level
% relative to the minimum distance between levels. A low NSD means low error risk,
% while NSD approaching 0.5 indicates a high chance of symbol errors due to noise.
function [std_total,std_lvl] = calc_std_(test_signal,reference_signal)
assert(length(test_signal) == length(reference_signal),"Sequence length does not match");
error_vector = (test_signal-reference_signal);
%%% Overall EVM
std_total = std(test_signal);
test_signal = test_signal ./ rms(test_signal);
try
%%% Per Level EVM
% Ensure input is column vector
test_signal = test_signal(:);
reference_signal = reference_signal(:);
assert(length(test_signal) == length(reference_signal), "Sequence length does not match");
% Find unique levels and their minimum spacing
k = unique(reference_signal);
d_min = min(diff(k)); % Minimum distance between adjacent levels
% Normalize test signal to RMS=1 (if not already)
test_signal = test_signal / rms(test_signal);
% Overall standard deviation (not normalized)
std_total = std(test_signal);
% Per-level standard deviation and normalized std
std_lvl = zeros(1, length(k));
nsd_lvl = zeros(1, length(k));
for lvl = 1:length(k)
% lvl_errors = error_vector(reference_signal==k(lvl));
std_lvl(lvl) = std(test_signal(reference_signal==k(lvl)));
idx = reference_signal == k(lvl);
if any(idx)
std_lvl(lvl) = std(test_signal(idx));
nsd_lvl(lvl) = std_lvl(lvl) / d_min;
else
std_lvl(lvl) = NaN;
nsd_lvl(lvl) = NaN;
end
end
catch
std_lvl = NaN;
warning('No EVM per level calculated')
end
end
function [data_,reference_] = trimseq(data,reference,skipstart,skip_end)
data_ = data(skipstart+1:end-skip_end,:);