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This paper studies the coordinated multicell downlink transmission to cope with the severe Inter-Cell Interference (ICI) in future cellular systems. The authors propose an iterative scheme to jointly optimize the Base Station (BS) and relay beamforming weights to maximize the worst-case Signal-to-Interference-and-Noise Ratio (SINR) with perfect Channel State Information (CSI), under two different types of BS and relay power constraints, respectively, which are the total power constraints and individual power constraints. Using the Semi-Definite Relaxation (SDR) technology, the optimization problems for BS and relay beamforming weights can be converted into Semi-Definite Programming (SDP) problems, which can be effectively solved by interior-point methods.
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