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Frequency offset estimation and compensation method based on broadband frequency hopping system

A technology of frequency offset estimation and broadband frequency hopping, which is applied in the field of frequency offset estimation and compensation, can solve the problems of reduced coherent demodulation performance and system reception performance degradation, and achieves flexible design, high estimation performance, and strong system adaptability Effect

Active Publication Date: 2017-05-10
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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AI Technical Summary

Problems solved by technology

[0004] In a complex electromagnetic environment, the frequency offset and phase offset estimation results will be affected by interference signals, thereby reducing the performance of coherent demodulation, and ultimately leading to a decrease in the receiving performance of the entire system

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  • Frequency offset estimation and compensation method based on broadband frequency hopping system
  • Frequency offset estimation and compensation method based on broadband frequency hopping system
  • Frequency offset estimation and compensation method based on broadband frequency hopping system

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0022] The present invention aims at the low accuracy of estimation and compensation of frequency offset and phase offset in coherent demodulation under broadband frequency hopping system for high-speed mobile platforms, and proposes a high-precision, wide-range frequency offset and phase offset estimation and compensation method. Remarkable performance in complex electromagnetic environment.

[0023] The present invention comprises the following steps:

[0024] (1) Firstly, at the transmitting end, each message is divided into multiple pulses and sent (the number of pulses is recommended to be greater than 10), in order to increase the number of frequency hopping points to improve the anti-interference performance, and the synchronization composed of known pseudo-random se...

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Abstract

The invention provides a frequency offset estimation and compensation method based on broadband frequency hopping system. The method comprises the following steps: dividing each to-be-transmitted message into a plurality of pulses with the two ends of each pulse added by a synchronous frame header consisting of known pseudo-random sequences; correlating the front end and the back end of the received synchronous frame header with the local PN codes respectively to obtain the frequency offset estimation values; normalizing the frequency offset estimation values of different frequency points; utilizing the signal-to-noise ratio estimation information as weighted values for weighted sums so as to obtain relatively accurate frequency offset estimation values; then, conducting anti-normalization followed by the compensation for the different frequency points so as to obtain the phase offset estimation value of each pulse; conducting phase offset compensation; and finally restoring the received data and conducting coherent demodulation. The method proposed in the invention can estimate and compensate the frequency offset in a high speed wide frequency hopping system, and can provide good performances especially in a complex electromagnetic environment.

Description

technical field [0001] The invention relates to a method for estimating and compensating frequency offset and phase offset. Background technique [0002] Due to the communication between high-speed mobile platforms, a large Doppler frequency shift will be generated (the maximum speed of the mobile platform can make the highest Doppler frequency shift generated by the received signal reach fd=25KHz), so the estimation range of the frequency offset The requirements are wider. [0003] In order to improve the anti-interference performance, the frequency hopping technology is used at both ends of the transceiver, and the frequency hopping bandwidth reaches hundreds of megahertz. In this way, the difference of Doppler frequency shift from different frequency points is obvious, and the estimated value of each frequency point cannot be calculated. Unified processing, and in the frequency hopping system, the phase between the pulses is no longer continuous, therefore, it is necessa...

Claims

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Application Information

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IPC IPC(8): H04L7/04H04L27/00
Inventor 段鹏雷一昇宋英杰李超李峰靳鹏
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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