一种近程水下声光一体化高速通信系统

A High-speed,Short-range,Underwater Optical-acoustic Communication System

摘要:

水下光通信具有高数据速率、低链路延迟等优势，但水体浑浊、对准困难等原因限制了其应用， 声通信则因具有互补性可被用于组成声、光混合通信系统。但考虑到声、光信号不同传播特性，常规上此类声、光混合通信系统均采用声、光用独立调制、解调的方式实现，造成较高的硬件系统开销。因此，提出了近程水下声光一体化高速通信方案，该方案采用 PPM 调制方式，基于同一套调制、解调模块以一体化的方式支持声、光 2 种通信链路，通过声、光 2 种通信模式的一体化实现，以更低的系统硬件实现复杂度提供具有更好的指向特性、水质、环境噪声适应性的近距高速链路。经水池实验验证：该系统在近程通信时，声、光通信链路均可实现 1 Mbps 数据速率的无误码通信。

关键词:水下无线通信;声光一体通信;PPM 调制

Abstract:

Underwater optical communication has advantages such as high data rate and low link delay， however，it is limited by turbidity of water and difficulty in alignment. Acoustic communication can be used to form a hybrid acoustic and optical communication system due to its complementarity. However，considering the different propagation characteristics of acoustic and optical signals，such hybrid communication systems usually use independent modulation and demodulation，which requires high hardware cost. In this paper，a high-speed short-range underwater optical-acoustic integration communication scheme is proposed. The scheme adopts PPM modulation mode. It is based on the same set of modulation and demodulation module，and supports acoustic and optical communication links in an integrated way. Its lower system hardware complexity can provide a short range high-speed link with better pointing characteristics，water quality，and environmental noise adaptability. Pool experiment verifies that the system in this paper can realize error-free short-range communication at 1Mbps data rate in both acoustic and optical communication links.

Key words:underwater wireless communication ; optical-acoustic integration communication ; PPM modulation