摘要
将时间反转法应用于水下扩频编码通信,在分析水下波导中时间反转自适应聚焦特性的基础上,研究了时间反转法克服多径效应对编码信号造成的波形畸变,采用BPSK(Binary Phase Shift Keying)编码方式,选取7位巴克码(Barker code) 作为扩频编码信号的码型,在实验水槽内进行了时间反转法用于水下通信的实验研究并进行了相应的理论分析。理论和实验证明了时间反转法能获得聚焦增益并提高编码信号相关解码时的主副瓣比,因此时间反转法应用于水下编码通信时,可望降低误码率和提高水下通信距离。
Time reversal is applied to the underwater spreading spectrum coding communication. On the base of analyzing the focusing characteristics of the time reversal in underwater waveguide, the time reversal is studied to overcome the wave distortion of the coding signal caused by the multi-path effect. The experiment research for underwater coding communication is carried out in a lab water tank and the corresponding theoretical analysis is also conducted by Binary Phase Shift Keying (BPSK) encoding and 7 chips Barker code for the spreading spectrum signal. The results show that the time reversal can improve the focusing gain and increase the ratio of the principal to the second lobe of the coding signal, and can decrease the bit error rate and increase the communication distance.
出处
《声学学报》
EI
CSCD
北大核心
2005年第4期349-354,共6页
Acta Acustica
基金
国家自然科学基金重点资助项目(10134020)
关键词
时间反转法
水下通信
扩频编码
自适应聚焦
波形畸变
BPSK
Acoustic signal processing
Acoustic wave transmission
Adaptive algorithms
Bit error rate
Decoding
Focusing
