BLIND PHASE-SHIFT KEYING (PSK) AND QUADRATURE AMPLITUDE MODULATION (QAM) IDENTIFICATION

摘要

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.

主权项

1. A method for blind identification of a received phase-shift keying (PSK) modulated radio frequency (RF) signal, comprising:
uniform sub-sampling the received RF signal to reduce a phase contribution from a carrier frequency of the received RF signal; computing a likelihood function calculation of observed phase differences of the sub-sampled received RF signal of a phase sequence for each PSK modulation type; finding a maximum value of the likelihood function calculation; and identifying a PSK modulation type of the received PSK modulated RF signal based on the maximum value of the likelihood function calculation.