MIMO Underwater Acoustic Communications for Rate Enhancement and Range Extension
Abstract
Our research focuses on the horizontal underwater acoustic communications. For high data rate applications, such as image transmission or multiuser networks at long ranges. coherent underwater acoustic communication is of great importance. In this direction, we consider multi-input multi-output (MIMO) transmit beamforming under the uniform elemental power constraint. This is a non-convex optimization problem, and the optimal transmit beamformer is usually difficult to construct. We will first find a beamforming solution in an ideal setup. and then consider practical finite-rate feedback methods required to implement the transmit beamforming. On the other hand, the highly time-varying and frequency-selective underwater acoustic channel consists of a great challenge for channel estimators necessary for coherent communications. Such difficulty is aggravated when multiple transducers and/or hydrophones are deployed. Therefore, we also investigate differential MIMO transmission and reception approaches tailored for doubly-selective MIMO channels. To enhance the system error performance. we notice that the three-dimensional space-time-frequency variation of the underwater channel can be exploited to provide three-dimensional diversity gain. Based on all these, we also develop a differential MIMO transceiver tailored for doubly-selective underwater channels.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 10, 2007
- Accession Number
- ADA474814
Entities
People
- Jiantao Li
- Liuqing Yang
Organizations
- University of Florida