Academy of Mathematics and Systems Science, CAS Colloquia & Seminars
Speaker:
Prof. Chong-Yung Chi,Institute of Communications Engineering & Department of Electrical Engineering National Tsing Hua University, Hsinchu, Taiwan
Inviter:
Yafeng Liu
Title:
Multicell Coordinated Beamforming with Rate Outage Constraint
Time & Venue:
2015.7.7 16:00-17:30 Z311
Abstract:
The beamforming design for weighted sum rate maximization in a multiple-input single-output (MISO) interference channel (IFC) with only channel distribution information (CDI) available at the transmitters has drawn extensive attention recently. In this talk, we present some new results on the transmit beamforming design under individual transmit power constraints and rate outage constraints. We first analyze the complexity status of this beamforming design problem, and show that this problem is NP-hard in general. Therefore, we are interested in developing efficient and effective approximation algorithms for handling this beamforming design problem. First of all, a recently proposed successive convex approximation (SCA) algorithm to search for a stationary solution in polynomial time is introduced. In spite of good performance of the SCA algorithm, it is computationally too expensive to handle the problem instances with a large number of transmitters and receivers. By a judicious problem reformulation, we further propose a Gauss-Seidel type algorithm, called distributed block successive upper bound minimization (DBSUM) algorithm, and a Jacobi-type algorithm, called distributed weighted minimum mean-square error (DWMMSE) algorithm, for the outage-constrained beamforming design problem. These two algorithms are also shown to converge to the stationary points (solutions); moreover, simulation results demonstrate that both algorithms significantly outperform the SCA algorithm in performance and computational efficiency.
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