HF-VHF communication frame synchronization system and method

Abstract

The invention discloses an HF-VHF communication frame synchronization system and a method, mainly solving the problems of excessive device resource consumption and poor frame synchronization performance of the existing frame synchronization method. The frame synchronization process of the invention is as follows: a PN sequence is repeated for M times at a transmitting terminal to form a frame synchronization sequence; then control information or data is inserted behind the frame synchronization sequence to form a whole data frame to be sent out; a receiving signal and the local PN sequence are performed with correlation operation on a receiving end by a correlator, and a correlation value is written into a storage unit; the storage unit outputs M paths of parallel correlation values to a parallel decision device; if M paths of parallel correlation values all reach a preset threshold, M observation windows whose length is N are opened, the average values of correlation values with sameposition in the window are calculated, and a frame synchronization timing signal is produced according to maximum value position in N average values; or capture is continued. The invention has the characteristics of small device resource consumption and favourable frame synchronization performance, and can be used in HF-VHF communication to realize frame synchronization.

Description

technical field [0001] The invention belongs to the technical field of communication, relates to wireless communication technology, in particular to a frame synchronization method, which can be used to realize frame synchronization in HF-VHF communication. Background technique [0002] HF-VHF communication mainly uses the reflection and scattering of HF-VHF signals by channels such as ionosphere, discrete E layer, meteor trail and atmospheric waveguide to communicate, which is an important means of ground, aviation and marine communication. [0003] Signals transmitted through HF-VHF wireless channels are often affected by ionospheric disturbances, multipath effects, and frequency offsets, and with the continuous acceleration of urbanization and the rapid development of wireless communications, HF-VHF communications face many new challenges. Problem: First, the increasing congestion of wireless signals significantly increases wireless background noise; second, industrial noi...

AI Technical Summary

Problems solved by technology

[0003] Signals transmitted through HF-VHF wireless channels are often affected by ionospheric disturbances, multipath effects, and frequency offsets, and with the continuous acceleration of urbanization and the rapid development of wireless communications, HF-VHF communications face many new challenges. Problems: Firstly, the increasingly crowded wireless signals significantly increase the wireless background noise; secondly, industrial noise and interference gradually occupy the HF-VHF frequency band; thirdly, the noise generated by vehicles such as vehicles is increasing day by day

In this method, a PN sequence is usually used as the frame synchronization sequence. In the current deteriorating wireless communication environment, although better frame synchronization performance can be obtained by increasing the length of the PN sequence, due to the increase in the correlation calculation length, the communication system The increase in the demand for device resources is not conducive to the realization of the communication system

Images