Signal synchronization method and system

Abstract

The invention provides a signal synchronization method and a system thereof. The method is characterized in that a transmitter generates a short sequence and a long sequence according to a bandwidth of a leading signal which is about to be sent; the leading signal which successively includes a plurality of repeated short sequences and the at least one long sequence is modulated to a communication channel and is sent; a receiver detects whether to acquire a signal of a communication satellite and receives the leading signal; if the signal of the communication satellite is acquired, a search window is used to search each short sequence ending position and carry out coarse synchronization; if the signal of the communication satellite is not acquired, a preset search window is slide in preset transmission time, received baseband signals in the transmission time are traversed, each short sequence ending position is searched and based on the short sequence ending position, the coarse synchronization is performed; and mutual correlation is performed on the received long sequence, and based on an acquired mutual correlation peak value, signal synchronization is further performed. In the prior art, synchronization is not accurate and an operand is large. By using the method and the system of the invention, the above problems are solved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a signal synchronization method and system. Background technique [0002] Synchronization technology is a key technology in the communication system and the premise of establishing a communication link. Especially for self-organizing networks, synchronization is the first problem to be solved in the first step. Common synchronization methods are based on training sequences and blind synchronization schemes. [0003] Among them, the Preamble synchronization scheme based on the 802.16e standard is composed of three approximately identical data in the time domain, resulting in insufficient fine synchronization performance and relatively complex operations. [0004] However, in the blind search scheme using the cyclic prefix characteristics of OFDM symbols, the initial synchronization process takes a long time to search. Especially in a scenario without GPS, the calculation load ...

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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a signal synchronization method and system for solving the problems of inaccurate synchronization and large amount of computation in the prior art

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