PCMA signal single-channel blind separation method based on improved particle filter

Abstract

The invention provides a PCMA signal single-channel blind separation method based on an improved particle filter and belongs to the technical field of signal processing. The method is characterized by carrying out framing processing on a received single PCMA signal, determining parameter value range and distribution and initializing particles; carrying out updating according to a significance sampling function and a particle trajectory before the current time to obtain new particles; calculating particle importance weight values and setting a threshold value to discard particles, which contribute little to posteriori distribution, so that calculation is simplified by dynamically adjusting the total number of the particles; after obtaining parameter estimation values of two paths of uplink signals by utilizing a linear minimum mean square error criterion, designing a parameter-known signal separation method, and in the recursive calculation process of a likelihood function, discarding trajectories, the quality of which is poor, to further reduce calculation amount; and finally, obtaining symbol sequence estimation values of the two paths of uplink signals by utilizing a maximum likelihood criterion. Compared with the original algorithm, which adopts a state exhaustive method, the method can obviously reduce the calculation amount; and the method discards the poor-quality particles, so that computation accuracy required by real-time realization of the algorithm is reduced.

Description

technical field [0001] The invention relates to paired carrier multiple access (PairedCarrierMultipleAccess, PCMA) signal processing, specifically a PCMA signal single channel blind separation problem based on improved particle filter. Background technique [0002] Paired Carrier Multiple Access (PCMA) is a new communication technology used to improve the utilization rate of satellite channel frequency band. In the PCMA satellite communication system, two different ground stations share the uplink and downlink, so the uplink signals sent by the two satellite terminals occupy the same frequency band, and the two uplink signals overlap each other in the time domain. In some special occasions, it is necessary to obtain the information sequence sent by the two parties from the PCMA signal. For example, in military communication, it is necessary to intercept the information as a third party, so that the traditional PCMA technology cannot continue to be used in non-cooperative com...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem of blind separation of PCMA signals in non-cooperative communication, and propose a single-channel blind separation method based on improved particle filter, which solves the problem of joint estimation of parameters and symbol sequences of PCMA signals

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