Precoding and Power Allocation for Full-Duplex MIMO Relays

Jong-Ho LEE  Oh-Soon SHIN  

IEICE TRANSACTIONS on Communications   Vol.E94-B    No.8    pp.2316-2327
Publication Date: 2011/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2316
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
decode-and-forward,  full-duplex relay (FDR),  block-diagonalization (BD),  power allocation,  

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In this paper, we propose precoding and power allocation strategies for full-duplex multiple input multiple output (MIMO) relays. The precoding scheme for full-duplex MIMO relays is derived based on the block diagonalization (BD) method to suppress the self-interference in the full-duplex relaying so that each relay station (RS) can receive multiple data streams from the base station (BS), while forwarding the decoded data streams to mobile stations (MS's) simultaneously. We also develop the optimal power allocation scheme for full-duplex MIMO relays. Numerical results verify that the proposed scheme provides substantial performance improvement compared with the conventional half-duplex relay (HDR), if sufficient physical isolation between the transmit and receive antennas is ensured such that the proposed full-duplex MIMO relays operate in a tolerable self-interference range.