Time-Reversal Division Multiple Access in Multi-Path Channels
Multi-path effect makes high speed broadband communications a very challenging task due to the severe Inter-Symbol Interference (ISI). By concentrating energy in both spatial and temporal domains, Time-Reversal (TR) transmission technique provides a great potential of low-complexity energy-efficient communications. In this paper, the authors develop a new concept of Time-Reversal Division Multiple Access (TRDMA) as a wireless channel access method based on its high-resolution spatial focusing effect. They propose to use TR structure in a multiuser downlink system over large delay spread channels, where the signals of different users are separated solely by TRDMA.