Fast timing synchronizing method of full-duplex communication system

Abstract

The invention relates to a fast timing synchronizing method of a full-duplex communication system, which belongs to the technical field of the timing synchronization of wireless communication. The method is characterized by comprising the steps: adopting two identical PN code sequences as pilot signals through a transmitting-terminal data frame, receiving the signal through a receiving terminal, delaying the signal for a PN code period, aligning a second PN code with a first PN code of the delayed received signal, multiplying the first PN code and the second PN code by taking the first PN code and the second PN code as corresponding sampling points, counting the quantity of the multiplied values which are greater than a set threshold value in the length of the PN code period, carrying out the multiplication operation of the corresponding sampling points on the delayed receiving signal and the local PN code sequence if the statistic quantity is greater than a critical value of the quantity, then counting the quantity of the multiplied values which are greater than the set threshold value in the length of one PN code period, and if the statistic quantity still exceeds the critical value of the set quantity, determining the head part of a delaying unit as a timing synchronizing point. By adopting the method, the timing synchronization is realized by ingeniously utilizing the self-correlation characteristic of the PN code and the random characteristic of the noise, the multiplication times can be reduced, the operand is reduced, the accumulation operation is not needed by adopting the threshold value comparison way, and the timing synchronizing point can be rapidly and accurately found.

Description

technical field [0001] The invention relates to a fast timing synchronization method of a full-duplex communication system, in particular to a delay multiplication PN code synchronization acquisition method. Background technique [0002] Timing synchronization is one of the key technologies of full-duplex communication systems, and the performance of timing synchronization directly affects the communication quality. Timing synchronization algorithms for wireless communications are mainly divided into three categories: training sequence-based synchronization algorithms, cyclic prefix-based synchronization algorithms, and blind synchronization algorithms. Currently, the most commonly used synchronization algorithms are training sequence-based synchronization algorithms. The classic algorithm of the synchronization algorithm based on the training sequence mostly adopts the PN code sequence as the training sequence, and the performance of synchronous acquisition of the PN code d...

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Problems solved by technology

Many scholars have done a lot of research on PN code synchronous capture, for example, "OFDM Timing Synchronization Algorithm" (ISSN1000-1565, Vol. 31,No.6,November2011,31(6)) used the sliding correlation method to capture the PN code in the synchronization algorithm. When the phase difference or time difference between the two PN codes is large, the relative sliding speed It is very slow, so that the time to search for timing synchronization points is too long, especially for long PN codes, and some special shorter code sequences have to be used; The multiplication and addition operation with a length of one PN code has a relatively large amount of calculation

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