High frequency domain energy concentration synchronization method based on fractional Fourier transform

Abstract

The invention provides a high frequency domain energy concentration synchronization method based on fractional Fourier transform. Three chirp signals are connected in series as a synchronization signal, and the synchronization signal is transmitted at a transmitting terminal; the transmitted synchronization signal is received at a receiving terminal, and the fractional Fourier transform in performed on the received synchronization signal to produce a fractional domain magnitude spectrum; three peak value positions of the fractional domain magnitude spectrum are detected, and the three peak value positions are compared with peak value positions in the case of without time offset and without frequency offset to produce an offset deviation; calculating time offset and frequency offset of the system according to the offset deviation; and adjusting a time window position of the system and the frequency of local carrier waves according to the time offset and the frequency offset of the system to realize synchronization. Aiming at low synchronization signal frequency domain energy concentration and susceptible system synchronization accuracy problems in synchronization methods adopted in modern frequency modulation communication systems, a synchronization method based on the fractional Fourier transform is provided. The method is applicable for synchronization of communication signals.

Description

technical field [0001] The invention relates to a time-frequency joint synchronization method with high frequency domain concentration. Background technique [0002] As a key technology in the communication system, synchronization technology directly affects the performance of the communication system. The early synchronization method is the time-domain synchronization method, which utilizes the autocorrelation of the synchronization signal, uses the correlation operation to process it at the receiving end, and realizes synchronization by searching for the correlation peak. Since frequency offset often exists in modern wireless communication systems, time-frequency joint synchronization methods are often used. [0003] In order to solve the problems of poor time-frequency synchronization performance and high system complexity of modern time-frequency synchronization methods, in 2009, Sha Xuejun and others proposed a time-frequency joint synchronization method based on fract...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a synchronous signal with continuous time-domain waveform and smooth frequency change, which can solve the problem of broadening the spectrum of the overall communication signal due to frequency hopping of the synchronous signal under the premise of ensuring time-frequency synchronization performance and reducing system complexity A Fractional Fourier Transform-Based High Frequency Domain Energy Concentration Synchronization Method for the Problem of

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