A Method of Amplitude Estimation for Time-Frequency Overlapping Signals

Abstract

Disclosed is a method for estimating the amplitude of time-frequency overlapped signals. The method comprises the steps that S1, the four-order circulation cumulant of the received time-frequency overlapped signals is obtained, and a four-order circulation cumulant amplitude spectrogram is obtained; S2, when the symbol rates of all the signal components of the overlapped signals are different and integral multiple relations do not exist, the symbol rates of all the components are estimated according to a disperse spectrum line detection method; S3, according to the symbol rates of all the components obtained by estimation, the value of the four-order circulation cumulant at the symbol rates is obtained on a four-order circulation cumulant amplitude spectrogram; the amplitude values of all the components of the overlapped signals are estimated according to the symbol rates and the value of the four-order circulation cumulant of the symbol rates obtained in the step S2 and the step S3. The method can be used for estimating the amplitude of the signal components of the time-frequency overlapped signals, good estimation performance is achieved in a low SNR environment, and good robustness is achieved for the frequency spectrum overlapping ratio.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an amplitude estimation method of a single-channel time-frequency overlapping signal. It can be used for amplitude estimation of time-frequency overlapping QPSK signal, 8PSK signal and 16PSK signal under single channel. Background technique [0002] With the development of communication technology and the increasingly complex electromagnetic environment, there are more and more time-frequency overlapping signals in the communication field. If adjacent satellites are too close together, adjacent satellite signal interference will be formed, and the increasingly dense signals will cause same-frequency signal overlap. wait. On the one hand, this type of signal greatly affects the receiving performance of the system; on the other hand, the traditional single-signal processing method is no longer suitable for the overlap of two or more signals, so it is urgent to st...

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Problems solved by technology

This method estimates the amplitude of the mixed signal by extracting discrete spectral lines on the cyclic spectral section, but this method requires the two signals to have the same symbol rate, otherwise there will be pairing ambiguity when selecting spectral lines (Rui Guosheng, Xu Bin , Zhang Song. Amplitude Estimation Algorithm for Single-Channel Mixed Signal[J]. Journal of Communications, 2011,32(12):82-87.)

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