Coordinated beamforming for the multi-cell multi-antenna wireless system

—In a conventional wireless cellular system, signal processing is performed on a per-cell basis; out-of-cell interference is treated as background noise. This paper considers the benefit of coordinating base-stations across multiple cells in a multi-antenna beamforming system, where multiple basestations may jointly optimize their respective beamformers to improve the overall system performance. This paper focuses on a downlink scenario where each remote user is equipped with a single antenna, but where multiple remote users may be active simultaneously in each cell. The design criterion is the minimization of the total weighted transmitted power across the base-stations subject to signal-to-interference-and-noise-ratio (SINR) constraints at the remote users. The main contribution is a practical algorithm that is capable of finding the joint optimal beamformers for all base-stations globally and efficiently. The proposed algorithm is based on a generalization of uplinkdownlink dua...

• Type: Conference
• Year: 2008
• Where: CISS
• Authors: Hayssam Dahrouj, Wei Yu
• Keywords: CISS 2008, Information Management, Multi-antenna Beamforming System, Remote Users, Signal Processing