Beamforming and power control for multi-antenna cognitive two-way relaying

Authors:
Kommate Jitvanichphaibool;Ying-Chang Liang;Rui Zhang
Affiliations:
Institute for Infocomm Research, A*STAR, Singapore;Institute for Infocomm Research, A*STAR, Singapore;Institute for Infocomm Research, A*STAR, Singapore
Venue:
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Year:
2009

Citing 6
Cited 1

Convex Optimization

Convex Optimization
Optimal beamforming for two-way multi-antenna relay channel with analogue network coding

IEEE Journal on Selected Areas in Communications - Special issue on network coding for wireless communication networks
Cooperative diversity in wireless networks: Efficient protocols and outage behavior

IEEE Transactions on Information Theory
Cognitive radio: brain-empowered wireless communications

IEEE Journal on Selected Areas in Communications
Spectral efficient protocols for half-duplex fading relay channels

IEEE Journal on Selected Areas in Communications
Joint Beamforming and Power Allocation for Multiple Access Channels in Cognitive Radio Networks

IEEE Journal on Selected Areas in Communications

Optimal Precoder Design for Non-Regenerative MIMO Cognitive Two-Way Relay Systems with Underlay Spectrum Sharing

Wireless Personal Communications: An International Journal

Quantified Score

Hi-index	0.00

Visualization

Abstract

This paper considers a cooperative and cognitive radio (CCR) system where two secondary users (SUs) exchange their information through a "cognitive" relay station (RS) via the two-way relaying. The SUs share the same spectrum with a primary user (PU) while maintaining the interference power at the PU under a certain level. In order to enhance the achievable sum rate, the cognitive RS exploits the channel state information (CSI) of channel links from the RS to PU and from the RS to SUs to determine the relay beamforming (BF) and the transmit power levels for the RS and SUs. The structures of the optimal relay BF and suboptimal BF schemes based on the subspace projection are presented. Both orthogonal and non-orthogonal projection are considered. In addition, power control algorithms are proposed to satisfy the transmit power constraints as well as the interference power constraints. Numerical results are provided to compare the performance of the optimal relay BF with that of the suboptimal ones and also to justify the benefit of the optimal power allocation.