摘要
水下无人航行器(UUV)的水声通信涉及UUV与指挥舰船以及UUV之间的水声通信技术,通信系统的环境复杂、距离多变。若采用单一数据率传输模式,则通信系统受制于最大工作距离以及最恶劣信道而采用最保守的通信数据率,使得该类型的水声通信的数据率较低。提出了适合于UUV之间及其与指挥舰船之间远、中、近全程变数据率通信的自适应多制式正交多载波(MOM C)水声通信技术,该技术可使通信系统在不同距离、不同信道环境下的通信数据率逼近该信道的最高值。湖试结果为误码率<10-4时,5 km通信数据率为9090 b/s,25 km为2000 b/s。
Aim. It is well known that there are many obstacles that make high speed UWA communication among UUVs （underwater unmanned vehicles） and between UUVs and commanding ship very difficult to implement. We now propose achieving it with our adaptive MOMC technology. In the full paper, we explain in detail how to achieve such UWA communication; in this abstract, we just add some pertinent remarks to listing the three topics of explanation： （1） channel model of UWA communication, （2） adaptive MOMC technology, and （3） adaptive algorithm based on SNR （signal to noise ratio） threshold; under topic 2, we give Fig. 1 in the full paper as the schematic of the flow chart of adaptive MOMC ＂communication; topic 3 explains how to take into consideration the communication range that exists for a short time interval in the acoustic channel and then explains how the adaptive MOMC system can adaptively select the suitable mode for this short time interval; the subtopics of topic 3 are the selection of adaptive modulation （subtopic 3.1）, the selection of adaptive bandwith （subtopic 3.2） and the allocation of bit size and power to each subcarrier （subtopic 3.3）. The results of experiments conducted in a lake, summarized in Table 2 in the full paper, show preliminarily the correctness and efficiency of our adaptive MOMC system as the transmission data rates reach 9090bps and 2000 bps in the range of 5 km and 25 km respectively with the bit error rate 〈10^-4.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2007年第1期142-147,共6页
Journal of Northwestern Polytechnical University
基金
国家自然科学基金(60572098)资助
关键词
水声通信
水下无人航行器(UUV)
多制式正交多载波(MOMC)
underwater acoustic （UWA） communication, underwater unmanned vehicle （UUV）, adaptive muhimode orthogonal muhicarrier （MOMC）
