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In this paper, system design for the multi-input multi-output (MIMO) relaybroadcast channel with individual signal-to-interference-plus-noise ratio(SINR) constraints at the mobile stations (MS) is considered. By exploring thestructure of downlink (DL) uplink (UL) duality at either the base station (BS)or the relay station (RS), we propose two schemes of joint power allocation andbeamforming design at the BS and the RS. The problem of existence of feasiblesolutions under practical power constraints at the BS and the RS with givenSINR targets is considered first. Then the problem of sum power minimization isconsidered. Each design problem can be solved efficiently using optimal jointpower allocation and beamforming under the framework of convex optimization. Wealso show that with subchannel pairing at the RS, the transmission power can bereduced by channel compensation at either hop. Finally, an extension to moregeneral multi-hop applications is provided to further improve the powerefficiency.

Joint Beamforming and Power Allocation for MIMO Relay Broadcast Channel with Individual SINR Constraints