College of Information Science and Technology, Ocean University of China, Qingdao 266100, China.
SEACom Department, L@bisen Yncréa-Ouest, 29228 Brest CEDEX 2, France.
Sensors (Basel). 2018 Nov 7;18(11):3815. doi: 10.3390/s18113815.
The objective of this study is to investigate a novel Underwater Acoustic Communication (UWAC) system based on a modulated chirp signal termed as Orthogonal Chirp Division Multiplexing (OCDM). Originating from the Fresnel transform, OCDM uses chirp signals to exploit the multipath diversity of the channel, achieving a good robustness against frequency fading, especially in the underloaded scenario where only a subset of the available waveforms is modulated. The implementation of the OCDM system for the UWAC scenario is described, and the performance results over an experimental water tank and realistic replayed underwater channel are compared against the traditional Orthogonal Frequency Division Multiplexing (OFDM) transmission scheme.
本研究旨在探索一种基于调制啁啾信号的新型水下声通信（UWAC）系统，称为正交啁啾分复用（OCDM）。OCDM 源自菲涅耳变换，利用啁啾信号来利用信道的多径分集，在仅调制部分可用波形的欠载情况下，对频率衰落具有良好的鲁棒性。本文描述了 UWAC 场景下 OCDM 系统的实现，并将其性能结果与传统的正交频分复用（OFDM）传输方案在实验水池和真实回放水下信道中的性能进行了比较。
