A Frame Synchronization Method of Burst CPM Signal Against Frequency Offset

Abstract

The invention discloses a frequency deviation-resistant burst CPM signal frame synchronization method, which belongs to the technical field of wireless and mobile communication. The present invention firstly calculates the one-bit, three-bit and five-bit differences of the received baseband I and Q signals; then calculates the one-bit, three-bit and five-bit differences of the received baseband I and Q signals and the one-bit, three-bit Bit and five-bit differential cross-correlation, and then the cross-correlation value at the same time is calculated and accumulated; finally, based on the cross-correlation value, it is determined whether the preamble sequence exists, and the approximate starting position of the preamble sequence is determined. The invention can not only achieve good synchronization effect under low signal-to-noise ratio, but also has the technical effects of simple realization result, small calculation amount and convenient engineering realization.

Description

technical field [0001] The invention belongs to the technical field of wireless and mobile communication, and in particular relates to a frequency offset-resistant burst CPM (Continuous Phase Modulation) signal frame synchronization method Background technique [0002] For two devices that are communicating, if there is a large relative motion speed in the direction of the connection between the two devices, a large Doppler frequency shift will be generated in the received signal. Doppler frequency shift will have a great impact on the back-end processing part of the communication receiver. [0003] In order to solve this effect, in 1972, James L. Massey proposed the optimal decision criterion for PSK signal frame synchronization in the additive Gaussian white noise channel in the paper "Optimum Frame Synchronization". This algorithm can achieve good results under low SNR conditions. However, in this algorithm, it is assumed that the received signal is continuous and there ...

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Problems solved by technology

Doppler frequency shift will have a great impact on the back-end processing part of the communication receiver

[0003] In order to solve this effect, in 1972, James L. Massey proposed the optimal decision criterion for PSK signal frame synchronization in the additive Gaussian white noise channel in the paper "Optimum Frame Synchronization". This algorithm can achieve good results under low SNR conditions. However, in this algorithm, it is assumed that the received signal is continuous and there is no timing deviation, and the Doppler frequency shift in the received signal is not considered. This assumption is not valid in practical applications

In 2002, Zae Yong Choi and Yong H.Lee proposed a frame synchronization algorithm suitable for MPSK signals in the paper "Frame Synchronization in the Presence of Frequency Offset". A good synchronization effect can also be achieved under the signal-to-noise ratio, but in this algorithm it is assumed that there is no timing deviation in the received signal

However, it is only suitable for frame synchronization in the case of high signal-to-noise ratio. When the signal-to-noise ratio in the received signal is low, the synchronization effect of the traditional frame synchronization method will drop sharply

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