Earticle

초록

영어

Traditional beamforming and power control algo-rithms in cognitive radio (CR) are based on the assumption of perfect channel state information (CSI) however; this may lead to performance degradation in realistic systems. In this paper, the problem of joint beamforming and power control is investigated in underlay CR networks with imperfect CSI. Our objective is to maximize the sum utility of secondary users (SUs) under the primary users (PUs) interference power constraints and the transmission power constraint of SUs. First, the joint beamforming and power control problem is formulated under game theory framework, where the SUs compete with each other over the beamforming vectors and transmission power level made available by the PUs. Moreover, the channel uncertainty is described using ellipsoid sets and the interference power constraints can be converted into robust interference power constraints. Besides, Nash equilibrium (NE) is considered as the solution of this game. Finally, simulation results show that the proposed scheme can converge to a locally optimal pair of beamforming vector and transmission power level in the presence of channel uncertainty.

목차

Abstract
 1. Introduction
 2. System Model and Problem Formulation
 3. Game under Imperfect CSI
  3.1. Game-theoretic Formulation
  3.2. Second Order Cone Programming Solution
  3.3. Analysis of NE
 4. Numerical Results
 5. Conclusion
 Acknowledgements
 References

키워드

저자

• Jie Chen [ School of Electro-Mechanical Engineering, Xidian University, Xian 710071, China, Chang jiang Computer Group Corporation, Shanghai 200001, China ]
• Wen Xi [ Chang jiang Computer Group Corporation, Shanghai 200001, China ]
• Xiaolong Sun [ Chang jiang Computer Group Corporation, Shanghai 200001, China ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  International Journal of Future Generation Communication and Networking

• 간기

  격월간

• pISSN

  2233-7857

• 수록기간

  2008~2016

• 십진분류

  KDC 505 DDC 605