Band-limited system timing recovery method based on p-moment

Abstract

The invention relates to a band-limited system timing recovery method based on p-moment. In a feedback phase-locked loop, the pth power of a signal module value is adopted for calculating a timing-error detection output value, and p>0 and p is a variable parameter. The method of the invention can be applied to a timing recovery loop, better residual timing error jitter performance can be acquired, and in an AWGN channel, normalized mean square error performance through timing recovery is close to a theoretical Cramer-Rao bound. The method of the invention can be applied to a band-limited communication system with a small roll-off factor, and can be applied to a satellite communication system which needs to improve the spectrum utilization ratio.

Description

technical field [0001] The invention relates to the technical field of digital wireless communication transmission, in particular to a timing recovery method for a band-limited system based on p-order moments. Background technique [0002] In a satellite communication system, it is often necessary to perform root-raised cosine shaping on the transmitted signal to improve the spectrum of the signal and reduce interference to adjacent frequency bands. In a digital receiver, it is necessary to recover the timing of the sampled signal to obtain accurate modulation symbols. Timing recovery algorithms are mainly divided into two categories: data-assisted methods and non-data-assisted methods. It is difficult to obtain pilot data before timing synchronization, so non-data-assisted timing methods are more commonly used. Non-data-assisted methods can be divided into two types: forward timing and feedback timing. The forward timing method is suitable for communication systems with ...

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Problems solved by technology

At this time, the performance of the traditional timing recovery method based on GA algorithm is poor,

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