Experimental Evaluation of Uplink Underwater Acoustic Communications in Very High Frequency Massive MIMO System

摘要

Massive-MIMO is a proposed technique for the next generation of mobile communication. Here the number of antennas at the base station outnumbers that of the terminals by orders of magnitude. Theoretical work has shown a large increase in spectral efficiency for both Rayleigh and line-of-sight channels. In this paper we evaluate the massive-MIMO concept for wideband very high frequency underwater acoustic communications. Using 64 hydrophones, we analyze how non-perfect channel estimates and multiuser interference depend on the number of hydrophones. Our results show that in some of the measured channels the output SINR grows in proportion to the number of hydrophones, whereas in other channels it reached a threshold. However the results encourage further research.