Title :
Distributed Multicell Beamforming With Limited Intercell Coordination
Author :
Huang, Yongming ; Zheng, Gan ; Bengtsson, Mats ; Wong, Kai-Kit ; Yang, Luxi ; Ottersten, Björn
Author_Institution :
Sch. of Inf. Sci. & Eng., Southeast Univ., Nanjing, China
Abstract :
This paper studies distributed optimization schemes for multicell joint beamforming and power allocation in time-division-duplex (TDD) multicell downlink systems where only limited-capacity intercell information exchange is permitted. With an aim to maximize the worst-user signal-to-interference-and-noise ratio (SINR), we devise a hierarchical iterative algorithm to optimize downlink beamforming and intercell power allocation jointly in a distributed manner. The proposed scheme is proved to converge to the global optimum. For fast convergence and to reduce the burden of intercell parameter exchange, we further propose to exploit previous iterations adaptively. Results illustrate that the proposed scheme can achieve near-optimal performance even with a few iterations, hence providing a good tradeoff between performance and backhaul consumption. The performance under quantized parameter exchange is also examined.
Keywords :
array signal processing; cellular radio; intercarrier interference; iterative methods; optimisation; time division multiplexing; SINR; backhaul consumption; distributed multicell beamforming; distributed optimization; iterative algorithm; limited intercell coordination; multicell downlink systems; multicell joint beamforming; power allocation; quantized parameter exchange; signal-to-interference-and-noise ratio; time division duplex; Array signal processing; Downlink; Interference; Joints; Optimization; Resource management; Signal to noise ratio; Limited capacity backhauling; multicell beamforming; uplink–downlink duality;
Journal_Title :
Signal Processing, IEEE Transactions on
DOI :
10.1109/TSP.2010.2089621