Terminal Collaborative MIMO Reception Technique: Theory and Application to Mobile Environments

Abstract

Multiple-input multiple-output (MIMO) transmission is a practical frequency-efficient transmission technology that employs multiple transmission and reception antennas to multiplex multiple signals at the same frequency. In this paper, we describe an advanced form of MIMO transmission, in which wireless terminals collaborate with other terminals to expand the equivalent number of antennas and improve the channel capacity. We assume that the recently developed high-speed and low-latency transmission technology in high-frequency bands will be used for collaborative communications among terminals. We explain the relationship among collaboration traffic, spatial correlation, and transmission capacity, and present the results of field experiments conducted in a suburb of Kyoto City.