Frame synchronization method and frame synchronization module

Abstract

The invention discloses a frame synchronization method and a frame synchronization module, for receiving data obtained at each moment, the method comprises the following steps: performing differential correlation calculation on the receiving data at the current moment to obtain a differential correlation sequence corresponding to the current moment; acquiring a local correlation sequence representing differential correlation information of the SOF sequence; performing phase judgment on each data in the differential correlation sequence corresponding to the current moment to obtain a symbol sequence; performing XOR processing on the local correlation sequence and the symbol sequence to obtain a judgment weight; obtaining a correlation value by using the differential correlation sequence corresponding to the current moment and the local correlation sequence; multiplying the decision weight by the correlation value to obtain a decision value; and comparing the decision value with a preset threshold value to obtain a capture result of the initial position of the frame at the current moment. According to the invention, differential correlation calculation and hard decision are firstly carried out on the received data, and the accumulation result obtained based on the simplified differential posterior accumulation algorithm is used as the weighted value of the correlation value, so that the frequency offset resistance characteristic and the frame initial position detection probability can be improved.

Description

technical field [0001] The invention belongs to the technical field of digital communication, and in particular relates to a frame synchronization method and a frame synchronization module. Background technique [0002] In a satellite communication system, data is mainly transmitted in a frame format, and it is very important for a receiver to accurately find the starting position of each frame. Frame synchronization is an important part of soft demapping and decoding of data, which directly affects the system performance of the receiver. [0003] However, in the actual communication process, due to the long communication distance, signal fading, signal interference, and the influence of the Doppler effect, etc., there is usually a frequency offset in the received signal. Therefore, in this case, how to improve the detection probability of the frame start position by the frame synchronization module of the receiver is an urgent problem to be solved in this field. Contents...

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Problems solved by technology

[0003] However, in the actual communication process, due to the long communication distance, signal fading, signal interference, and the influence of the Doppler effect, etc., there is usually a frequency offset in the received signal.

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