An underwater acoustic direct sequence spread spectrum communication system using dual spread spectrum code

Lan-jun LIU; Jian-fen LI; Lin ZHOU; Peng ZHAI; Hao ZHAO; Jiu-cai JIN; Zhi-chao LV

doi:10.1631/FITEE.1700746

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An underwater acoustic direct sequence spread spectrum communication system using dual spread spectrum code

Special Issue on Marine Information Technology | Updated：2022-05-19

- An underwater acoustic direct sequence spread spectrum communication system using dual spread spectrum code
- 基于双扩频码的水声直接序列扩频通信系统
- Frontiers of Information Technology & Electronic Engineering Vol. 19, Issue 8, Pages: 972-983(2018)
- Affiliations：
  
  College of Engineering, Ocean University of China, Qingdao 266100, China
  The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
  College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China
- Author bio：
  
  Lan-jun LIU, E-mail: hdliulj@ouc.edu.cn
  [ "Jian-fen LI, E-mail: ljfouc@126.com" ]
- Funds：
- DOI：10.1631/FITEE.1700746
  CLC： TN92
- Received：10 November 2017，
  
  Revised：2018-;8-;8，
  
  Published：2018-08
- Accepted：
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Lan-jun LIU, Jian-fen LI, Lin ZHOU, et al. An underwater acoustic direct sequence spread spectrum communication system using dual spread spectrum code[J]. Frontiers of Information Technology & Electronic Engineering, 2018, 19(8): 972-983.
DOI：

Lan-jun LIU, Jian-fen LI, Lin ZHOU, et al. An underwater acoustic direct sequence spread spectrum communication system using dual spread spectrum code[J]. Frontiers of Information Technology & Electronic Engineering, 2018, 19(8): 972-983. DOI： 10.1631/FITEE.1700746.

摘要

针对水下点对点通信和水下码分多址(CDMA)组网高稳定性、高可靠性水声通信需求，提出一种基于双扩频码的水声直接序列扩频通信系统。为解决信息数据速率与多普勒估计、信道估计和数据帧同步精度之间的矛盾，设计了一种基于双扩频码的数据帧结构。其中，训练序列采用长扩频码，可用于数据帧检测与同步、多普勒估计和信道估计，有效信息数据的扩频调制采用短扩频码。系统多普勒估计采用一种延迟互相关算法，信道估计采用一种相关算法。水下组网应用时，每个用户分配一对扩频码。仿真结果表明，该系统具有良好的抗多径、抗干扰、抗多普勒性能，信噪比大于−10 dB时系统误码率可低于10

−6

，数据速率可高达355比特/秒，可用于水下CDMA网络的下行链路中。

Abstract

With the goal of achieving high stability and reliability to support underwater point-to-point communications and code division multiple access (CDMA) based underwater networks

a direct sequence spread spectrum based underwater acoustic communication system using dual spread spectrum code is proposed. To solve the contradictions between the information data rate and the accuracy of Doppler estimation

channel estimation

and frame synchronization

a data frame structure based on dual spread spectrum code is designed. A long spread spectrum code is used as the training sequence

which can be used for data frame detection and synchronization

Doppler estimation

and channel estimation. A short spread spectrum code is used to modulate the effective information data. A delay cross-correlation algorithm is used for Doppler estimation

and a correlation algorithm is used for channel estimation. For underwater networking

each user is assigned a different pair of spread spectrum codes. Simulation results show that the system has a good anti-multipath

anti-interference

and anti-Doppler performance

the bit error rate can be smaller than 10

-6

when the signal-to-noise ratio is larger than -10 dB

the data rate can be as high as 355 bits/s

and the system can be used in the downlink of CDMA based networks.

关键词

Keywords

references

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