Iterative blind symbol synchronization method based on symmetric binary search successive approximation principle

Abstract

The invention discloses an iterative blind symbol synchronization method based on a symmetric binary search successive approximation principle. The method comprises the following steps: determining a value of an iteration number N, wherein an iteration counter n is set, the value n is equal to 1, 2,..., N, synchronous operation is carried out on the nth iteration symbol, and operation is executed as follows: data is input into the timing deviation corrector, when n is equal to 1, TEC input [1] is equal to BFmf, and when n is equal to 2, 3,..., N, TEC input [n] is equal to TEC valve [n-1]; generating two symmetrical residual timing deviation pre-estimated values; performing timing deviation correction on the input burst signal frame by the timing deviation corrector according to the generated residual timing deviation pre-estimated value to obtain a correction result; screening out an effective correction result from the correction results; judging whether the symbol synchronization operation of N iterations is completed or not, and if so, outputting an effective correction result as a final result of symbol synchronization; and if not, continuing to execute the iterative symbol synchronization operation. According to the method, the timing deviation does not need to be displayed and estimated, pilot assistance is not needed, and good synchronization performance is still achieved even under the conditions of low-power oversampling and low signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of digital communication and relates to synchronization technology, in particular to an iterative blind symbol synchronization method based on the principle of symmetrical binary search and successive approximation. Background technique [0002] Symbol synchronization is responsible for accurately recovering useful data symbols from received signals with timing deviations. figure 1 It is an open-loop feed-forward symbol synchronizer commonly used in burst communication receivers. A typical open-loop feed-forward symbol synchronization method is as follows: First, use some statistical estimation method to explicitly estimate the timing deviation of the burst signal. Then, the timing deviation of the burst signal is corrected according to the estimated value of the timing deviation. Among them, the pros and cons of the timing offset estimation method will have a direct impact on the performance of symbol syn...

AI Technical Summary

Problems solved by technology

However, because the burst signal frame is usually short and contains few pilot symbols, it is difficult for data-assisted timing offset estimation methods to achieve good estimation results

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