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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 symbol shift keying (CSK) spread spectrum is widely used in underwater acoustic communications to overcome the limitations of spread-spectrum gain on communication rates. In order to obtain a higher communication speed, this paper proposes an underwater acoustic communication method based on the combination of orthonormal dual-channel M-element and CSK based on the large number of Gold sequences, good autocorrelation and cross-correlation. Through formula derivation, it describes the modulation and demodulation process of orthogonal M-ary CSK and the factors affecting its performance. And, by comparing with the simulation of dual-channel M-ary CSK, the error rate curve of orthogonal M-ary CSK is obtained. Finally, the validity of the simulation is verified by experiments. And achieved error-free transmission of 1096.8 bps communication rate with 10 kbits of data. Through the derivation, simulation and experiments, we can get the conclusion that orthogonal M-ary CSK provides excellent communication performance.