远程水声通信MC-MPSK及均衡方法

水声信道是一种多途、时变和频散的信道，声波在其中的传输行为十分复杂，加之水声传输的带宽有限及远距离传输时的载波频率较低，使得传输距离和数据率这一对矛盾尤为突出，如何在增大作用距离的同时提高传输数据率是水声通信的难点。在80km海上试验和分析研究MC、MPSK编码调制的基础上，提出了适合于远程高速水声通信的MC-MPSK的编码调制方法，以及基于MC-MPSK编码调制的梳状均衡方法，建立浅海远程水平通信的信道模型，对均衡器及系统的性能进行仿真，仿真结果表明该编码调制方法可实现低信噪比、多径水声信道的高数据率传输。

Proposing a Method for Attaining High Data Transmission Rate in Long-Range Underwater Acoustic Communication

We aim to present a better method for long range communication in UWA (underwater acoustic) channel that is multi-path,time-varying and frequencydispersive.Based on the oceanic experiments in 80 km range communication and the theoretical study of MC(multi carrier) and MPSK(multi phase shift keying) modulations,a novel method of MC-MPSK modulation is presented in this paper.In the full paper,we explain the better method in much detail.In it we successively discuss four points:(1) the model of UWA communication channel;(2) the method of MC-MPSK modulation and demodulation combines the MFSK(multi frequency shift keying) with MPSK;the carrier of MPSK is the frequency information of MFSK;the information is transmitted by both frequencies and phases of signals;(3) the comb equalizer for MC-MPSK in the fading UWA communication channel;(4) the simulation results of the comb equalizer and the MC-MPSK;one result particularly worth noticing is that the SNR(signal to noise ratio) can be less than-10 dB when the BER(bit error rate) is 10~(-4).The simulation results indicate that MC-MPSK is useful in long-range underwater acoustic communication.