UMFSK水声通信技术研究

在MFSK基础上，本文提出了UMFSK信道编码方法。采用窄带调频和跳频调制技术，故在一定程度上抑制了由多途效应引起的码内/码间干扰；提出了基于UMFSK的实时信道标校技术，可对信道进行稳键均衡，抗信道多途引起的码内干扰。进行了湖试，取得了试验数据并进行了数据分析。分析表明：UMFSK可抑制码元相消干涉引起的码内干扰，其效果随码元调频带宽的增大而变好；信道标校技术可对信道进行稳键均衡，并由于结构简单，可做到实时实现。基于UMFSK的误码率为10^-3（通信带宽2kHz,速率100-150bps)。

A study on UMFSK underwater acoustic communication

in place of CW modulation in MFSK, both frequency modulation and frequency shifting are introduced in UMFSK to combat signal fluctuation caused by the multipath propagation of sound in oceans. To combat temporal, spatial variability of channel, an UMFSK based channel checking is developed that can be a robust equalizer. Experiments were carried out in a lake and data analyses were done, both of which show that UMFSK can suppress negative symbol interference and that the wider the bandwith of the symbol coding, the better the suppressing. Error-rate of UMFSK can be 10-3 where the communication bandwith is 2kHz and the communication rate 100-150bps.