Computer Science – Information Theory
Scientific paper
2011-08-23
Computer Science
Information Theory
This paper has been withdrawn by the author due to some flaws in the proof of theorem 1
Scientific paper
This paper studies the coordinated beamforming design problem for the multiple-input single-output (MISO) interference channel, assuming only channel distribution information (CDI) at the transmitters. For a given requirement on the rate outage probability for receivers, we aim to maximize the system utility (e.g., the weighted sum rate, weighted proportional fairness rate, and the weighed harmonic mean rate) subject to the rate outage constraints and individual power constraints. The outage constraints, however, lead to a complicated, nonconvex structure for the considered beamforming design problem and make the optimization problem difficult to handle. While this nonconvex optimization problem can be solved in an exhaustive search manner, this brute-force approach is only feasible when the number of transmitter-receiver pairs is small. For a system with a large number of transmitter-receiver pairs, computationally efficient alternatives are necessary. The focus of this paper is hence on the design of such efficient approximation methods. In particular, by employing semidefinite relaxation (SDR) and first-order approximation techniques, we propose an efficient successive convex approximation (SCA) algorithm that provides high-quality approximate beamforming solutions via solving a sequence of convex approximation problems. The solution thus obtained is further shown to be a stationary point for the SDR of the original outage constrained beamforming design problem. In addition, we propose a decentralized SCA algorithm where each transmitter optimizes its own beamformer using only local CDI. Our simulation results demonstrate that the proposed SCA algorithm and its decentralized counterpart indeed converge, and near-optimal performance can be obtained for all the considered system utilities.
Chang Tsung-Hui
Chi Chong-Yung
Li Wei-Chiang
Lin Che
No associations
LandOfFree
Coordinated Beamforming for Multiuser MISO Interference Channel under Rate Outage Constraints does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Coordinated Beamforming for Multiuser MISO Interference Channel under Rate Outage Constraints, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coordinated Beamforming for Multiuser MISO Interference Channel under Rate Outage Constraints will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-66606