Title :
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
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;
Conference_Titel :
OCEANS 2006 - Asia Pacific
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-0138-3
Electronic_ISBN :
978-1-4244-0138-3
DOI :
10.1109/OCEANSAP.2006.4393940
