摘要
针对远程水声通信速率低的问题,提出了采用混沌调频M-ary(M元)通信方式提高通信速率的办法。将混沌序列引进到水声通信中来,由于量化后混沌序列的优良相关特性受到一定的破坏,为此提出了混沌调频M-ary通信体制,研究得出了混沌调频的重要特性:自相关特性好、正交码数目多、频谱利用率高、带宽和时间调整灵活等;给出了水声混沌调频M-ary通信系统的组成框图,并进行了海上实验。实验数据分析结果与理论值符合较好,表明这种通信体制是可行的,并能有效地提高通信速率。
In order to improve the data rate of long-range underwater acoustic communication (UWAC) system working on low frequency band, a type of communication mode is presented, that is Chaotic-FM M-ary mode. The chaotic sequences into UWAC field is introduced. Since the cross-correlation of the quantized chaotic sequences is damaged, Chaotic-FM signal which has many good properties, such as good correlation properties, numerous orthogonal codes, high utilization ratio of spectrum etc are studied. A block diagram of UWAC system based on Chaotic-FM M-ary mode is given out, and one sea test is designed to verify its feasibility and performance. The experimental results are in agreement with theoretical results. The Chaotic-FM M-ary mode is both feasible and reliable. It can improve the data rate of UWAC system.
出处
《声学学报》
EI
CSCD
北大核心
2004年第2期161-166,共6页
Acta Acustica
基金
国家自然科学基金(69802010)
