Synchronization method and device for sc-fde system with low signal-to-noise ratio

Abstract

The invention relates to a synchronization method and a synchronization device for a low signal-to-noise ratio SC-FDE system. The synchronization method includes: the sending end sends a data frame comprising a first training sequence A, a second training sequence B, a cyclic prefix CP and a data symbol, and the receiving end receives the data frame and performs the following steps: S1. Using the first training sequence A to adopt a parallel The code phase search algorithm detects the data frame, and obtains the coarse frequency offset estimation value to correct the coarse frequency offset value so as to obtain the data symbol after the coarse frequency offset correction; S2. Use the second training sequence B to perform fine frequency offset estimation, Correcting the fine frequency offset value to obtain the data symbol after the fine frequency offset correction; and S3. Using the second training sequence B to perform symbol timing estimation. The implementation of the present invention can effectively resist the influence of noise, and can realize a larger carrier frequency offset detection range, correct a sufficiently large frequency offset, and complete high-precision signal synchronization.

Description

technical field [0001] The present invention relates to the communication field, and more specifically relates to a low signal-to-noise ratio SC-FDE system synchronization method and synchronization device. 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 ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a low signal-to-noise ratio SC-FDE system synchronization method and synchronization device for the defects 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

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