Communication system and its synchronization method

Abstract

The invention relates to a communication system and a synchronization method thereof. A sending end sends data frames including a first training sequence A, a second training sequence C, a third training sequence D, a circulation prefix CP and data symbols; and a receiving end receives the data frames and implements the following steps that S1) the first training sequence A is used to detect the data frames in a parallel code phase searching algorithm, obtains an estimated coarse frequency offset value to correct the coarse frequency offset value, and further obtains a data symbol after coarse frequency offset correction; S2) the second training sequence C is used for estimation of fine frequency offset to correct the fine frequency offset value, and further obtains a data symbol after fine frequency offset correction; and S3) the second training sequence C and the third training sequence D are used for symbol timing estimation. According to the system and method, influence of noises can be effectively resisted, sufficiently large frequency offset can be corrected within a large carrier frequency offset detection range, the complexity of hardware realization and resource consumption of FPGA algorithm realization can be reduced, and the synchronization precision can be sufficiently high.

Description

technical field [0001] The present invention relates to the communication field, and more specifically, to a communication system and a synchronization method thereof. Background technique [0002] With the development of anti-fading technology and low-power receiving technology of wireless signals, the research of SC-FDE under the condition of low signal-to-noise ratio will become a hot spot in the future, especially "weightless" (a low-power wide-area Internet of Things technology Standard) has adopted SC-FDE technology as the main transmission scheme of the physical layer. Realizing M2M under the condition of low signal-to-noise ratio not only needs to strike a balance and compromise between signal-to-noise ratio and data throughput rate, but also requires anti-multipath transmission of signals within 15 kilometers. For M2M (Machine to Machine, machine-to-machine communication) digital communication systems with low signal-to-noise ratio, synchronization is a very import...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a communication system synchronization method and a communication system using this synchronization method in view of the defect of poor synchronization performance of the traditional SC-FDE system synchronization algorithm under the low signal-to-noise ratio condition of the prior art , which enables precise synchronization of signals

Images