BLIND PHASE-SHIFT KEYING (PSK) AND QUADRATURE AMPLITUDE MODULATION (QAM) IDENTIFICATION
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United States of America Patent
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Dec 1, 2016
app pub date -
Aug 9, 2016
filing date -
Apr 7, 2014
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Technology for blind phase-shift keying (PSK) and quadrature amplitude modulation (QAM) identification of a received radio frequency (RF) signal is disclosed. One method can include: uniform sub-sampling the received RF signal to eliminate a phase contribution from a carrier frequency of the received RF signal; and computing a likelihood function of observed phase differences of the sub-sampled received RF signal of a phase sequence for each PSK modulation type. Another method can include: non-uniformly sub-sampling the received RF signal for a distribution of signal amplitudes of the received RF signal; and computing a likelihood function of the signal amplitudes of the sub-samples of the received RF signal for each modulation type.
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