BOC调制信号在水声信道下的抗多途性能研究*

针对传统二进制相移键控调制信号在水声信道下需要较长的同步符号持续时间的问题,提出了基于二进制偏移载波调制信号的新型水声同步方案.对BOC信号的原理进行了讨论,通过理论推导和仿真分析,比较了提出的方案和传统方法.

Anti-multi-path Performance of BOC Signal over Underwater Acoustic Channel*

Aiming at the long synchronization symbol durance time of conventional BPSK modulated signal, the underwater acoustic (UWA) synchronization scheme based on BOC modulated signal is introduced. The principles of BOC signal is discussed, and the comparison of theory deduction and numerical results have been achieved between the proposed and conventional methods. First, power spectral density (PSD) and auto-correlation function (ACF) of BOC signal are analyzed. The criteria how to measure the synchronize performance under multi-path circumstance can be concluded in fast and slow fading situation respectively. The advantage of BOC synchronization performance signal is illustrated in theory. In addition, capture probability and synchronization precision is compared between BOC and BPSK over UWA channel. It is testified the advantage of BOC to anti-multi-path propagation (MP) in UWA channel.