摘要
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80 km海上试验和分析研究M C、M P-SK编码调制的基础上,提出了适合于远程高速水声通信的M C-M PSK的编码调制方法,以及基于M C-M PSK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。
We aim to present a better method for long range communication in UWA （underwater acoustic） channel that is multi-path, time-varying and frequency-dispersive. 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.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2005年第6期772-776,共5页
Journal of Northwestern Polytechnical University
关键词
远程水声通信
MC-MPSK
均衡方法
声波
水声信道
long-range acoustic communication, MC-MPSK （multi carrier-multi phase shift keying）,equalizer
