Multiple-antenna multiple-relay system with precoding for multiuser transmission

Multi-hop relaying will play a central role in next generation wireless systems. In this paper a novel relaying strategy that uses multiple-input multiple-output (MIMO) relays in a two-hop wireless network supporting multiuser transmission is proposed. The fixed relays linearly process the received signal, decode and forward it to multiple users. This relaying strategy employs MIMO spatial multiplexing to achieve high spectral efficiency and improve link capacity in cellular networks. In this paper the case when source (base station) and all the relays employ multiple antennas and each user has only one antenna is studied. New lower and upper bounds on the achievable sum rate for this architecture are derived. Zero-forcing dirty paper coding (ZF-DPC) at the base station is assumed and the direct link between the base station and users is neglected. We propose to jointly design precoding at the base station and linear processing at the relays to improve throughput subject to power con...

• Type: Conference
• Year: 2009
• Where: IWCMC
• Authors: Arash Talebi, Witold A. Krzymien
• Keywords: Achievable Sum Rate, Base Station, IWCMC 2009, Relay, Wireless Networks