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In this paper, we propose a simple linear multiuser precoding scheme for downlink cellular systems with a decode- and forward (DF) based relay, where the available information at a base station (BS) and a relay station (RS) is asymmetric. The proposed scheme not only eliminates the interference from a RS for the mobile station (MS) served by a BS but also provides the MS supported by a RS with a macro diversity gain without any information exchange between a BS and a RS. Consequently, the proposed scheme outperforms a conventional scheme and approaches an ideal scheme using dirty paper coding (DPC) in the information asymmetric configuration.
Date of Publication: January 2010