70 lines
2.2 KiB
Matlab
70 lines
2.2 KiB
Matlab
classdef PAMmapper_test < IMDDTestCase
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methods (Test, TestTags = {'unit', 'fast', 'transmit', 'pammapper'})
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function roundTripBitMappingForSupportedPamOrders(testCase)
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modulationOrders = [2, 4, 8];
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for M = modulationOrders
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txBits = Informationsignal(allBitPatternsForOrder(M));
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mapper = PAMmapper(M, 0);
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mapped = mapper.map(txBits);
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demapped = mapper.demap(mapped);
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testCase.verifyEqual(double(demapped.signal), double(txBits.signal), ...
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sprintf("Roundtrip mapping failed for PAM-%d.", M));
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end
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end
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function roundTripPam6ClassicMapping(testCase)
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txBits = Informationsignal(pam6BitStream());
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mapper = PAMmapper(6, 0);
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mapped = mapper.map(txBits);
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demapped = mapper.demap(mapped);
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testCase.verifyEqual(demapped.signal, txBits.signal, ...
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"PAM-6 classic mapping should be lossless for aligned inputs.");
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end
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function roundTripPam6EthMapping(testCase)
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txBits = Informationsignal(pam6BitStream());
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mapper = PAMmapper(6, 0, "eth_style", 1);
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mapped = mapper.map(txBits);
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demapped = mapper.demap(mapped);
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expectedBits = txBits.signal(1:length(demapped.signal));
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testCase.verifyEqual(demapped.signal, expectedBits, ...
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"PAM-6 ETH mapping should be lossless for aligned inputs.");
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end
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function quantizeMapsToNearestConstellationLevel(testCase)
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mapper = PAMmapper(4, 0);
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signalIn = Electricalsignal([-4.0; -0.2; 0.4; 2.9], "fs", 1);
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quantized = mapper.quantize(signalIn);
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expected = [-3; -1; 1; 3] ./ sqrt(5);
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testCase.verifyEqual(quantized.signal, expected, "AbsTol", 1e-12);
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end
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end
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end
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function bits = allBitPatternsForOrder(M)
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bitWidth = log2(M);
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symbols = (0:M-1).';
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bits = zeros(M, bitWidth);
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for bitIdx = 1:bitWidth
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bits(:, bitIdx) = bitget(symbols, bitWidth - bitIdx + 1);
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end
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end
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function bits = pam6BitStream()
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combinations = dec2bin(0:31, 5) - '0';
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bits = reshape(combinations.', [], 1);
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end
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