Feed-forward timing recovery method suitable for satellite communication burst transmission system

Abstract

The invention relates to a feed-forward timing recovery method suitable for a satellite communication burst transmission system. According to the method, timing deviation estimation is realized on the basis of a sliding accumulation method, so that the estimation accuracy can be increased, the calculated amount of timing deviation estimation is effectively reduced, and continuous processing of burst transmission data is realized. In the method, calculation is performed by adopting signal amplitude and a frame header is detected by adopting cross-correlation operation, so that the influence of signal frequency deviation on the timing deviation estimation can be avoided, namely, the signal frequency deviation does not need to be estimated. The feed-forward timing recovery method can be applied under the condition of severe channel environment, and is easy for engineering realization. The sampling clock period of a digital receiver is set to be a quarter of a symbol period, and the working frequency of the receiver is low.

Description

technical field [0001] The invention relates to the technical field of digital wireless communication transmission, in particular to a feedforward timing recovery method suitable for a satellite burst transmission system. Background technique [0002] In wideband satellite communication system receivers, symbol timing recovery is a key factor affecting the performance of demodulation reception. Classical symbol timing synchronization algorithms mainly include feedback phase-locking and feed-forward estimation methods. Among them, feedback timing synchronization generally adopts a phase-locked loop structure, and it takes a long time to converge the phase-locked loop, which inevitably causes data loss at the beginning of the transmission frame during each capture process, thereby reducing system Spectrum utilization. Therefore, it is often used in continuous data transmission applications such as broadcast transmission system DVB-S2 (second generation satellite digital vide...

AI Technical Summary

Problems solved by technology

[0004] In the existing literature on the reception and demodulation of short-term burst signals in satellite communication systems, the general research on algorithm improvement and performance analysis of timing deviation estimation is limited to theoretical research; or research on joint Fourier transform (DFT), The realization of feed-forward timing synchronization engineering of technologies such as Fourier series requires the design of accurate DFT window position and length. Longer DFT processing greatly increases the complexity of the receiving system, resulting in the timing performance being seriously affected by other technologies.

At present, there is no overall technical solution based on the feed-forward timing synchronization structure to solve the problem of accurate timing recovery of the frame head and frame tail.

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