正交M元码元移位键控扩频水声通信  

Orthogonal M-ary code shift keying spread spectrum underwater acoustic communication

作　　者：于洋 周锋 乔钢 聂东虎 

机构地区：[1]哈尔滨工程大学水声技术重点实验室,哈尔滨150001 [2]哈尔滨工程大学计算机科学与技术学院,哈尔滨150001

出　　处：《声学学报》2014年第1期42-48,共7页Acta Acustica

基　　金：国家青年自然科学基金(11304056);863重点项目(2009AA093601-2);国防基础项目研究(B2420110007);水声技术重点实验室基金(9140C200801110C2004)资助

摘　　要：M元和码元移位键控(CSK)扩频在水声通信中被广泛采用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,文章基于Gold序列较大的码本数量、良好的自相关和互相关特性,提出正交双通道的M元和CSK相结合的水声通信方法。通过公式推导描述了正交M元CSK的调制和解调流程及影响其性能的因素。并且,通过与双通道M元CSK的仿真比较,得到正交M元CSK的误码率曲线。最后,通过实验验证了仿真的有效性。并实现了10 kbits数据量下1096.8 bps通信速率的无误码传输。通过推导、仿真和实验,可以得到这样的结论:正交M元CSK提供了优良的通信性能。M-ary and code shift keying （CSK） spread spectrum is generally applied to overcome the spreading gain versus data rate limitation in underwater acoustic （UWA） communication. In addition, the concept of orthogonal M-ary CSK is introduced to UWA communication to gain higher rate. We propose a scheme employing double orthogonal channel M-ary and CSK spread spectrum UWA communication based on Gold sequences owing to its large set, good self and cross correlation. The modulation and demodulation scheme of orthogonal M-ary CSK and the factor which is critical to its performance is described by formula. Furthermore, its bit error rate （BER） curve is investigated via simulation and compared with double channel M-ary CSK. Finally, the validity of simulation is verified in experiment. 1096.8 bps data rate of the proposed communication scheme is realized in 10 kbits volume with no error. It is shown that the proposed method offers significantly improved performance through deduction, simulation, experiment and numerical results.

关 键 词：正交双通道 水声通信 扩频增益 键控 移位 码元 通信速率 GOLD序列 

分 类 号：TN929.3[电子电信—通信与信息系统]