Underwater Acoustic Spread Spectrum Communication Based on M Family N group Parallel Transmission

Author

He, Chengbing ; Huang, Jianguo

Author_Institution

Northwestern Polytech. Univ., Xi´´an

fYear

2007

fDate

16-19 May 2007

Firstpage

1

Lastpage

4

Abstract

Due to the low data rate of direct sequence spread spectrum (DSSS) underwater acoustic communication (UAC), a higher data rate spread spectrum UAC system based on M family phase modulation signal and N groups parallel transmission (MNSS) was designed. Lake tests were conducted and the results showed that it could reach 320 bps with BER below 10-4 at within the range of 25 km. In order to further improve the data rate of spread spectrum UAC, time overlapping method are introduced in this paper. Based on the saved channel (measured in lake tests), performance of time overlapping method and MNSS are compared. Simulation results show its robustness and relative higher data rate with little performance decrease. Meanwhile, a novel method for combining multipath messages using FFT/IFFT was also addressed to improve the performance of correlators in underwater environments. Computer simulates based on saved channel show its effectiveness with at least 2 dB processing gain.

Keywords

error statistics; spread spectrum communication; telecommunication channels; underwater acoustic communication; underwater sound; BER; M family N group parallel transmission; data rate; direct sequence spread spectrum; fast Fourier transform; lake tests; multipath messages; time overlapping method; underwater acoustic communication; Acoustic testing; Bit error rate; Computational modeling; Lakes; Phase modulation; Signal design; Spread spectrum communication; Time measurement; Underwater acoustics; Underwater communication;

fLanguage

English

Publisher

ieee

Conference_Titel

OCEANS 2006 - Asia Pacific

Conference_Location

Singapore

Print_ISBN

978-1-4244-0138-3

Electronic_ISBN

978-1-4244-0138-3

Type

conf

DOI

10.1109/OCEANSAP.2006.4393940

Filename

4393940