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A Regenerative Relay Transmission in Linearly Precoded MU-MIMO Downlink

Authors:
Yasunori Iwanami
Kentaro Iida

Keywords: Block Diagonalization; Eigen mode transmission; Regenerative relay; Detect & Forward

Abstract:
Recently, Muti-User MIMO (MU-MIMO) downlink system which uses multiple antennas at base station and accommodates multiple users with multiple receive antennas attracts much attention. In MU-MIMO downlink system, by knowing the Channel State Information (CSI) at the base station, Inter User Interferences (IUI’s) among users are pre-excluded at the base station. By increasing the number of transmit antennas assigned to each user, the transmission quality of each user is improved. In MU-MIMO, there exists linear precoding or nonlinear precoding method, but linear precoding is considered more easily implemented and adjusted than nonlinear precoding. In this paper, we aim the coverage extension and the transmission quality improvement by using a regenerative Detect & Forward (DF) relay in MU-MIMO downlink system. We use Block Diagonalization (BD) + Eigen mode transmission (E-SDM) for linear MU-MIMO scheme. By sharing the BD matrix at both base station and relay, the relay can demodulate the receive signal only with receive CSI and can forward the signal to each user. With this system configuration, we have shown the effectiveness of regenerative relay through simulations.

Pages: 51 to 56

Copyright: Copyright (c) IARIA, 2016

Publication date: May 22, 2016

Published in: conference

ISSN: 2308-4030

ISBN: 978-1-61208-473-2

Location: Valencia, Spain

Dates: from May 22, 2016 to May 26, 2016