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Quadrature multiplexed CPM
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DOI：10.1109/TCOMM.2008.050626.png)
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摘要
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This paper introduces a family of bandwidth efficient modulation schemes called quadrature multiplexed continuous phase modulation (QM-CPM). QM-CPM can be thought of as an alternative to smooth pulse-shaped quadrature amplitude modulation (QAM). Like pulse-shaped QAM, QM-CPM modulates smooth continuous signals onto the in-phase (1) and the quadrature-phase (Q) channels, but these signals are derived from CPM signals instead of being filtered to attain their desired smoothness and spectral properties. QM-MSK (QM-minimum shift keying) is developed and is shown to double the bits/Hz over MSK while maintaining MSK's normalized minimum distance of d(min)(2) = 2.0. Classes M-2-ary QMCPFSK QM-continuous phase frequency shift keying) signals are derived from constant envelope M-ary CPFSK signals to construct bandwidth efficient modulation schemes which are comparable to and offer advantages over pulse-shaped QAM.
Keyword:
CPM
modulation
error probability
bandwidth efficient
trellis
constellation
phase state
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8.3
论文数:
1.2W
被引数:
3.6W
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