物理学报Issue(1)：014302-1-014302-8,8.DOI:10.7498/aps.65.014302
基于时反镜能量检测法的循环移位扩频水声通信∗
Cyclic shift keying spread sp ectrum underwater acoustic communication using time reversal energy detector
摘要
Abstract
The fluctuation of sea surface and the Doppler effect cause carrier phase fluctuations of received signal, and the multipath expansion of the underwater acoustic channel makes received signal distorted, which can seriously influence the decoding performance of the cyclic shift spread spectrum system. In this paper, we propose cyclic shift energy detector (CS-ED) algorithm for cyclic shift keying spread spectrum system, which can solve the problem about the influence of carrier phase fluctuation by detecting the output energy of cyclic shift matched filter. The CS-ED combined with time reversal mirror is further proposed and analyzed in this paper by using a time-updated channel impulse-response estimate as a (match) filter to do time reversal processing to mitigate the multipath-induced interferences. Time reversal CS-ED method is simple and robust, which can make the system work in low SNR. Dalian Sea test validation and Lianhua lake test validation are carried on, showing that the low bit error rate underwater acoustic communication is achieved under the condition of multi-path extension, carrier phase fluctuation and low signal-to-noise ratio.关键词
水声通信/循环移位扩频/循环移位能量检测器/时间反转镜Key words
underwater acoustic communication/cyclic shift spread spectrum/cyclic shift energy detector/time reversal mirror引用本文复制引用
杜鹏宇,殷敬伟,周焕玲,郭龙祥..基于时反镜能量检测法的循环移位扩频水声通信∗[J].物理学报,2016,(1):014302-1-014302-8,8.基金项目
国家自然科学基金(批准号:51179034,61471137)和船舶预研支撑技术基金(批准号:13J3.1.5)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant Nos.51179034,61471137) and the Ship Pre-research and Support Technology Foundation, China (Grant No.13J3.1.5) （批准号:51179034,61471137）
