一种支持CDMA机制的水声扩频通信系统  

Underwater Acoustic Spread Spectrum Communication System for CDMA Mechanism

作　　者：王沁[1] 刘兰军[1] 张晓彤[1] 王有华[1] 刘金龙[1] 

机构地区：[1]北京科技大学信息工程学院,北京100083

出　　处：《系统仿真学报》2009年第24期7845-7850,共6页Journal of System Simulation

基　　金：国家高技术研究发展计划(863计划)项目(2006AA09Z115)

摘　　要：针对水声无线传感器网络基于CDMA组网的需求,提出了一种支持CDMA机制的水声扩频通信系统UADSSS/CDMA(a Direct Sequence Spread Spectrum based Underwater AcousticCommunication System for CDMA based Networks)。系统采用直接序列扩频方式,调制方式为BPSK/QPSK,信道编码采用RA码。为了降低接收机的相位捕获复杂度,发射机采用扩频码相位和载波相位同相的载波调制方式。接收机采用基于带通信号捕获的方法,支持码分多址访问,捕获算法为延迟相关捕获算法;采用先解扩后解调的系统结构,提高系统的通信速率。进行了基于MATLAB的仿真和基于实验系统的验证。仿真和实验结果表明,系统在抑制多径干扰和支持多用户通信方面具有良好的性能,在具有两个用户通信干扰的水池环境下,系统误码率为10-3数量级。For the requirements of CDMA based underwater acoustic wireless sensor networks,a direct sequence spread spectrum based underwater acoustic communication system （UADSSS/CDMA） was proposed.Direct sequence spread spectrum,BPSK/QPSK modulation and RA code based channel coding were used in this system.To reduce the phase-catch complexity of receiver,a carrier modulation method which let spreading code and carrier had the same phase was adopted in transmitter.To support code division multiple access,a band-pass signal based capture method was used in receiver,and the capture method was delay correlation capture algorithm.To improve the communication rate,an architecture of de-spreading before demodulation was used in receiver.MATLAB-based simulations and practical system based experiments were carried out.The results show that the proposed system has a good performance at supporting multi-user communication and suppressing multi-path interference.Under a pond environment with interference of two users,the bit error rate of the system is at 10-3 order of magnitude.

关 键 词：水声通信 直接序列扩频 RA码 CDMA 无线传感器网络 

分 类 号：TN929.3[电子电信—通信与信息系统]