Precoder Design for MIMO Relay Networks with Direct Link and Decision Feedback Equalisation

• Published in: IEEE communications letters Vol. 15; no. 10; pp. 1044 - 1046
• Main Authors: Millar, A. P., Weiss, S., Stewart, R. W.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.10.2011; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Channels; Covariance matrix; decision feedback equalisation; Decision feedback equalizers; Design engineering; Detection, estimation, filtering, equalization, prediction; direct link; Exact sciences and technology; Feedback; Information, signal and communications theory; Links; Matrix decomposition; MIMO; MIMO relay; non-linear transceiver design; Radiocommunications; Relay; Relay systems; Relays; Signal and communications theory; Signal to noise ratio; Signal, noise; Simulation; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Terminals; Transceivers; Transmission and modulation (techniques and equipments); Transmitters. Receivers; zero-forcing; Performance evaluation; MIMO system; Parameter estimation; Relay; Relay network; decision feedback equalisation; non-linear transceiver design; Bit error rate; direct link; Decision feedback equalizers; Transceiver; zero-forcing; Simulation; Channel estimation; Objective function; MIMO relay; Design for environment
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2011.081211.110691

In this letter we derive the source and relay precoders for a multiple-input multiple-output (MIMO) relay system with zero-forcing (ZF) decision feedback equalisation (DFE) when a direct link exists between the source and destination. Assuming full channel state information (CSI) is available at each node in the network, the processors are optimised for a large class of objective functions subject to the ZF condition and average power constraints at both the source and relay terminals. Simulation results show that the proposed design outperforms existing techniques in terms of bit error ratio (BER).