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srsDemodulationMapperUnittest.m
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srsDemodulationMapperUnittest.m
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%srsDemodulationMapperUnittest Unit tests for the modulation mapper functions.
% This class implements unit tests for the demodulation mapper functions using the
% matlab.unittest framework. The simplest use consists in creating an object with
% testCase = srsDemodulationMapperUnittest
% and then running all the tests with
% testResults = testCase.run
%
% srsDemodulationMapperUnittest Properties (Constant):
%
% srsBlock - The tested block (i.e., 'demodulation_mapper').
% srsBlockType - The type of the tested block, including layer
% (i.e., '/phy/upper/channel_modulation').
%
% srsDemodulationMapperUnittest Properties (ClassSetupParameter):
%
% outputPath - Path to the folder where the test results are stored.
%
% srsDemodulationMapperUnittest Properties (TestParameter):
%
% Modulation - Modulation scheme (see extended documentation for details).
% nSymbols - Number of modulated output symbols (257, 997).
%
% srsDemodulationMapperUnittest Methods (TestTags = {'testvector'}):
%
% testvectorGenerationCases - Generates a test vector for the given modulation
% scheme and number of symbols.
%
% srsDemodulationMapperUnittest Methods (Access = protected):
%
% addTestIncludesToHeaderFile - Adds include directives to the test header file.
% addTestDefinitionToHeaderFile - Adds details (e.g., type/variable declarations)
% to the test header file.
%
% See also matlab.unittest.
% Copyright 2021-2024 Software Radio Systems Limited
%
% This file is part of srsRAN-matlab.
%
% srsRAN-matlab is free software: you can redistribute it and/or
% modify it under the terms of the BSD 2-Clause License.
%
% srsRAN-matlab is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% BSD 2-Clause License for more details.
%
% A copy of the BSD 2-Clause License can be found in the LICENSE
% file in the top-level directory of this distribution.
classdef srsDemodulationMapperUnittest < srsTest.srsBlockUnittest
properties (Constant)
%Name of the tested block.
srsBlock = 'demodulation_mapper'
%Type of the tested block, including layers.
srsBlockType = 'phy/upper/channel_modulation'
end
properties (ClassSetupParameter)
%Path to results folder (old 'modulation_mapper' tests will be erased).
outputPath = {['testDemodulationMapper', char(datetime('now', 'Format', 'yyyyMMdd''T''HHmmss'))]}
end
properties (TestParameter)
%Number of modulated output symbols (257, 997).
nSymbols = {257, 997}
%Modulation scheme.
Modulation = {'BPSK', 'pi/2-BPSK', 'QPSK', '16QAM', '64QAM', '256QAM'}
end % of properties (TestParameter)
methods (Access = protected)
function addTestIncludesToHeaderFile(obj, fileID)
%addTestIncludesToHeaderFile Adds include directives to the test header file.
addTestIncludesToHeaderFilePHYchmod(obj, fileID);
fprintf(fileID, '#include "srsran/phy/upper/log_likelihood_ratio.h"\n');
end
function addTestDefinitionToHeaderFile(~, fileID)
%addTestDetailsToHeaderFile Adds details (e.g., type/variable declarations) to the test header file.
fprintf(fileID, 'struct test_case_t {\n');
fprintf(fileID, 'std::size_t nsymbols;\n');
fprintf(fileID, 'modulation_scheme scheme;\n');
fprintf(fileID, 'file_vector<cf_t> symbols;\n');
fprintf(fileID, 'file_vector<float> noise_var;\n');
fprintf(fileID, 'file_vector<log_likelihood_ratio> soft_bits;\n');
fprintf(fileID, 'file_vector<uint8_t> hard_bits;\n');
fprintf(fileID, '};\n');
end
end % of methods (Access = protected)
methods (Test, TestTags = {'testvector'})
function testvectorGenerationCases(testCase, nSymbols, Modulation)
%testvectorGenerationCases(TESTCASE, NSYMBOLS, MODSCHEME) Generates a test vector
% for the given number of symbols NSYMBOLS and modulation scheme and MODSCHEME.
import srsTest.helpers.writeInt8File
import srsTest.helpers.writeUint8File
import srsTest.helpers.writeFloatFile
import srsTest.helpers.writeComplexFloatFile
import srsLib.phy.helpers.srsGetBitsSymbol
import srsLib.phy.helpers.srsModulationFromMatlab
import srsLib.phy.upper.channel_modulation.srsDemodulator
import srsLib.phy.upper.channel_modulation.srsModulator
% Generate a unique test ID by looking at the number of files generated so far.
testID = testCase.generateTestID;
% Generate random test input as a bit sequence.
bitsSymbol = srsGetBitsSymbol(Modulation);
codeword = randi([0 1], nSymbols * bitsSymbol, 1);
% Call the symbol modulation MATLAB functions.
modulatedSymbols = srsModulator(codeword, Modulation);
% Create some noise samples with different variances (SNR in the range 0 -- 20 dB).
normNoise = randn(nSymbols, 2) * [1; 1i] / sqrt(2);
noiseStd = 0.1 + 0.9 * rand(nSymbols, 1);
noiseVar = noiseStd.^2;
% Create noisy modulated symbols.
noisySymbols = modulatedSymbols + noiseStd .* normNoise;
% Write noise variances to a binary file.
testCase.saveDataFile('_test_noisevar', testID, @writeFloatFile, noiseVar);
% Write noisy symbols to a binary file.
testCase.saveDataFile('_test_input', testID, @writeComplexFloatFile, noisySymbols);
% Demodulate (note that srsDemodulator returns integer values
% that can be directly assigned to int8_t variables).
softBits = srsDemodulator(noisySymbols, Modulation, noiseVar);
% Write soft bits to a binary file.
testCase.saveDataFile('_test_soft_bits', testID, @writeInt8File, softBits);
% Hard decision.
hardBits = (1 - (softBits > 0));
% Write hard bits into a binary file.
testCase.saveDataFile('_test_hard_bits', testID, @writeUint8File, hardBits);
% Generate the test case entry.
modSchemeString = srsModulationFromMatlab(Modulation, 'full');
testCaseString = testCase.testCaseToString(testID, {nSymbols, modSchemeString}, false, ...
'_test_input', '_test_noisevar', '_test_soft_bits', '_test_hard_bits');
% Add the test to the file header.
testCase.addTestToHeaderFile(testCase.headerFileID, testCaseString);
end % of function testvectorGenerationCases
end % of methods (Test, TestTags = {'testvector'})
end % of classdef srsDemodulationMapperUnittest