title: Time Reversal Acoustic Communication Using Filtered Multitone Modulation.
abstract: The multipath spread in underwater acoustic channels is severe and, therefore, when the symbol rate of the time reversal (TR) acoustic communication using single-carrier (SC) modulation is high, the large intersymbol interference (ISI) span caused by multipath reduces the performance of the TR process and needs to be removed using the long adaptive equalizer as the post-processor. In this paper, a TR acoustic communication method using filtered multitone (FMT) modulation is proposed in order to reduce the residual ISI in the processed signal using TR. In the proposed method, FMT modulation is exploited to modulate information symbols onto separate subcarriers with high spectral containment and TR technique, as well as adaptive equalization is adopted at the receiver to suppress ISI and noise. The performance of the proposed method is assessed through simulation and real data from a trial in an experimental pool. The proposed method was compared with the TR acoustic communication using SC modulation with the same spectral efficiency. Results demonstrate that the proposed method can improve the performance of the TR process and reduce the computational complexity of adaptive equalization for post-process.
authors.affiliation: College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China. zcbsunny@hrbeu.edu.cn.|Science and Technology on Underwater Acoustic Laboratory, Harbin Engineering University, Harbin 150001, China. zcbsunny@hrbeu.edu.cn.
authors.forename: Lin
authors.initials: L
authors.lastname: Sun
authors.affiliation: College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China. chenbaowei@hrbeu.edu.cn.|Science and Technology on Underwater Acoustic Laboratory, Harbin Engineering University, Harbin 150001, China. chenbaowei@hrbeu.edu.cn.
authors.forename: Baowei
authors.initials: B
authors.lastname: Chen
authors.affiliation: College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China. hsli@hrbeu.edu.cn.|Science and Technology on Underwater Acoustic Laboratory, Harbin Engineering University, Harbin 150001, China. hsli@hrbeu.edu.cn.
authors.forename: Haisen
authors.initials: H
authors.lastname: Li
authors.affiliation: College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China. zhoutian@hrbeu.edu.cn.|Science and Technology on Underwater Acoustic Laboratory, Harbin Engineering University, Harbin 150001, China. zhoutian@hrbeu.edu.cn.
authors.forename: Tian
authors.initials: T
authors.lastname: Zhou
authors.affiliation: College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China. liruo@hrbeu.edu.cn.|Science and Technology on Underwater Acoustic Laboratory, Harbin Engineering University, Harbin 150001, China. liruo@hrbeu.edu.cn.
authors.forename: Ruo
authors.initials: R
authors.lastname: Li
keywords: adaptive equalization; filtered multitone modulation; time reversal; underwater acoustic communication