A joint synchronization parameter estimation in fractional Fourier transform orthogonal frequency division multiplexing underwater acoustic communication system

Jia-Chun Zheng,Hai-Xin Sun,Cheng-Fu Yang,Jing Liu

doi:10.1177/1687814016638310

Abstract

In the conditions of Gaussian noise, symmetric alpha stable impulse noise, multipath propagation, Doppler effect, and so on, a joint synchronization algorithm is proposed for underwater acoustic communication system based on fractional Fourier transform orthogonal frequency division multiplexing. The algorithm realizes the orthogonal multicarrier underwater acoustic communication system synchronization based on that the symmetrical triangular linear frequency modulation signal has the energy convergence in the domain of fractional Fourier transform. In order to verify the effectiveness of the algorithm, hyperbolic frequency modulation signal and linear frequency modulation signal are used as the evaluation index, and the synchronization performance of bit error rate of them is compared by simulation and pool experiments. The simulation results show that the proposed algorithm in this article is resistant to Gaussian noise, symmetric alpha stable pulse noise, multipath propagation, and Doppler effect, compared with traditional synchronization algorithms; the synchronization error probability is low at the same signal-to-noise ratio.

Highlights

In the conditions of Gaussian noise, symmetric alpha stable impulse noise, multipath propagation, Doppler effect, and so on, a joint synchronization algorithm is proposed for underwater acoustic communication system based on fractional Fourier transform orthogonal frequency division multiplexing
The performance of synchronization signals of hyperbolic frequency modulation (HFM) and linear frequency modulation (LFM) compared with the time domain correlation method based on time delay was studied using fractional lower order cycle fuzzy function and joint estimation of Doppler frequency shift, for symmetric alpha stable (SaS) stable distribution noise to get better performance.[10,11,12]
This article puts forward a joint synchronization algorithm for orthogonal multicarrier underwater acoustic communication system based on symmetrical triangular linear frequency modulation (STLFM) signal as synchronization code

Summary

Introduction

In the conditions of Gaussian noise, symmetric alpha stable impulse noise, multipath propagation, Doppler effect, and so on, a joint synchronization algorithm is proposed for underwater acoustic communication system based on fractional Fourier transform orthogonal frequency division multiplexing. The performance of synchronization signals of hyperbolic frequency modulation (HFM) and linear frequency modulation (LFM) compared with the time domain correlation method based on time delay was studied using fractional lower order cycle fuzzy function and joint estimation of Doppler frequency shift, for SaS stable distribution noise to get better performance.[10,11,12] In order to further improve the performance of the synchronization parameters’ estimation in OFDM underwater acoustic communication system, the symmetrical triangular linear frequency modulation (STLFM) signals are used to obtain the higher joint estimation and synchronization performance.

Results

Conclusion