正交码元移位键控扩频水声通信

Orthogonal code shift keying spread spectrum underwater acoustic communication

码元移位键控(CSK)作为一种广义的M元扩频技术被广泛应用于水声通信领域来克服扩频增益对通信速率的限制.为了获得更高的通信速率,减少通道间干扰,并充分利用CSK的冗余信息,本文提出联合利用码元相位信息的正交双通道CSK扩频水声通信技术.首先,推导了正交CSK每符号积分输出的表达式;然后,研究了正交CSK的性能及与传统CSK和双通道CSK对比仿真的误码率;最后,通过实验验证了仿真对比的正确性.实现了正交CSK在104bits,4kHz带宽下580.6bps通信速率的有效传输.通过公式推导、仿真分析和实验研究,得到正交CSK提供了优良的性能的结论.

Code shift keying （CSK） is generally used to overcome the spreading gain versus data rate limitation in underwater acoustic （UWA） communication as generalized M-ary spread spectrum technology. In addition, the concept of orthogonal CSK is introduced into the UWA communication to achieve higher rate, mitigate crosstalk from the other thoroughfare and utilize the redundant information of CSK adequately. In this paper, we propose a new scheme employing orthogonal double thoroughfare CSK spread spectrum UWA communication with utilizing code phase information combined. First, each symbol integration output form of the proposed method is deduced. Furthermore, the property of orthogonal CSK is analyzed and its bit error rate is investigated as compared with conventional CSK and double thoroughfare CSK via simulation. Finally, the validity of simulation comparison is verified in experiment. 580.6 bps data rate of the proposed communication scheme is realized in 104 bit volume and 4 kHz bandwidth efficiently. It is shown that the proposed method provides significantly improved communication performance through formula, simulation and test.