Journal of Communications and Networks

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Adaptive OFDMA with Partial CSI for Downlink Underwater Acoustic Communications

  • Zhang, Yuzhi (School of Marine Science and Technology, Northwestern Polytechnical University) ;
  • Huang, Yi (Department of Electrical and Computer Engineering, University of Connecticut) ;
  • Wan, Lei (Aquatic Sensor Network Technology,) ;
  • Zhou, Shengli (Department of Electrical and Computer Engineering, University of Connecticut) ;
  • Shen, Xiaohong (School of Marine Science and Technology, Northwestern Polytechnical University) ;
  • Wang, Haiyan (School of Marine Science and Technology, Northwestern Polytechnical University)
  • Received : 2015.04.25
  • Accepted : 2015.09.20
  • Published : 2016.06.30
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Abstract

Multiuser communication has been an important research area of underwater acoustic communications and networking. This paper studies the use of adaptive orthogonal frequency-division multiple access (OFDMA) in a downlink scenario, where a central node sends data to multiple distributed nodes simultaneously. In practical implementations, the instantaneous channel state information (CSI) cannot be perfectly known by the central node in time-varying underwater acoustic (UWA) channels, due to the long propagation delays resulting from the low sound speed. In this paper, we explore the CSI feedback for resource allocation. An adaptive power-bit loading algorithm is presented, which assigns subcarriers to different users and allocates power and bits to each subcarrier, aiming to minimize the bit error rate (BER) under power and throughput constraints. Simulation results show considerable performance gains due to adaptive subcarrier allocation and further improvement through power and bit loading, as compared to the non-adaptive interleave subcarrier allocation scheme. In a lake experiment, channel feedback reduction is implemented through subcarrier clustering and uniform quantization. Although the performance gains are not as large as expected, experiment results confirm that adaptive subcarrier allocation schemes based on delayed channel feedback or long term statistics outperform the interleave subcarrier allocation scheme.

Keywords

Acknowledgement

Supported by : Chinese Scholarship Council (CSC), NSF, National Science Foundation of China

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