Browse > Article

Closed-form Expressions for Optimal Transmission Power Achieving Weighted Sum-Rate Maximization in MIMO Systems  

Shin, Suk-Ho (Department of Electronic Engineering, Sogang University)
Kim, Jae-Won (Department of Electronic Engineering, Sogang University)
Park, Jong-Hyun (Department of Electronic Engineering, Sogang University)
Sung, Won-Jin (Department of Electronic Engineering, Sogang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.47, no.7, 2010 , pp. 36-44 More about this Journal
Abstract
When multi-user MIMO (Multiple-Input Multiple-Output) systems utilize a sum-rate maximization (SRM) scheduler, the throughput of the systems can be enhanced. However, fairness problems may arise because users located near cell edge or experiencing poor channel conditions are less likely to be selected by the SRM scheduler. In this paper, a weighted sum-rate maximization (WSRM) scheduler is used to enhance the fairness performance of the MIMO systems. Closed-form expressions for the optimal transmit power allocation of WSRM and corresponding weighted sum-rate (WSR) are derived in the 6-sector collaborative transmission system. Using the derived results, we propose an algorithm which searches the optimal power allocation for WSRM in the 3-sector collaborative transmission system. Based on the derived closed-form expressions and the proposed algorithm, we perform computer simulations to compare performance of the WSRM scheduler and the SRM scheduler with respect to the sum-rate and the log-sum-of-average rates. We further verify that the WSRM scheduler efficiently improves fairness performance by showing the enhanced performance of average transmission rates in low percentile region.
Keywords
WSRM 스케쥴러;다중 사용자 MIMO;공평성;분산 안테나 시스템;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 A. J. Paulraj, D. A. Gore, R. U. Nabar, and H. Bolcskei, "An overview of MIMO communications-A key to gigabit wireless," in Proc. IEEE, vol. 92, pp. 198-218, Feb. 2004.   DOI   ScienceOn
2 G. J. Foschini and G. Gans, "On limits of wireless communications in a fading environment when using multiple antennas," Wireless Pers. Commun., vol. 6, pp. 311-335, Mar. 1998.   DOI   ScienceOn
3 양장훈, 장승훈, 김동구, "제로 포싱 빔 형성과 반직교 기반 사용자 선정을 이용한 클러스터 기반 셀 협력 전송 방식의 성능에 대한 연구," 전자공학회 논문지, 제 45권 TC편, 제 10호, 1-9쪽, 2008년 10월.   과학기술학회마을
4 H. Zhou, P. Fan, and J. Li, "Cooperative proportional fairness scheduling for wireless transmissions," in Proc. 2009 Int. Conf. Commun. and Mobile Com., Leipzig, Germany, June 21-24, 2009.
5 P. Viswanath and D. N. C. Tse, "Sum capacity of the vector Gaussian broadcast channel and downlink-uplink duality," IEEE Trans. Inform. Theory, vol. 49, no. 8, pp. 1912-1921, Aug. 2003.   DOI   ScienceOn
6 S. Vishwanath, N. Jindal, and A. Goldsmith, "Duality, achievable rates and sum rate capacity of Gaussian MIMO broadcast channel," IEEE Trans. Inform. Theory, vol. 49, no. 10, pp. 2658-2668, Oct. 2003.   DOI   ScienceOn
7 Y. J. Choi, J. Kim, and S. Bahk, "Downlink scheduling with fairness and optimal antenna assignment for MIMO cellular systems," in Proc. IEEE GLOBECOM, vol. 5, pp. 3165-3169, Nov. 2004.
8 M. Kobayashi and G. Caire, "Joint beamforming and scheduling for a multi-antenna downlink with imperfect transmitter channel knowledge," IEEE J. Sel. Areas Commun., vol. 25, no. 7, pp. 1468-1477, Sep. 2007.
9 M. Kobayashi and G. Caire, "An iterative algorithm for maximum weighted sum-rate of Gaussian MIMO-BC," IEEE J. Sel. Areas Commun., vol. 24, no. 8, pp. 1640-1646, Aug. 2006.
10 이지원, 성원진, "영점 강제 다중 사용자 MIMO 전송 시 셀 간 정보 교환을 활용한 협력적 PF 스케쥴러의 성능 평가," 전자공학회 논문지, 제 47권 TC편, 제 2호, 40-46쪽, 2010년 2월.   과학기술학회마을
11 G. Caire and S. Shamai, "On the achievable throughput of a multiantenna Gaussian broadcast channel," IEEE Trans. Inform. Theory, vol. 49, no. 7, pp. 1692-1706, July 2003.
12 H. Weingarten, Y. Steinberg, and S. Shamai (Shitz), "The capacity region of the Gaussian multiple-input multiple-output broadcast channel," IEEE Trans. Inform. Theory, vol. 52, no. 9, pp. 3936-3964, Sep. 2006.
13 G. J. Foschini, "Layered space-time architecture for wireless communication in a fading environment when using multiple antennas," Bell Labs. Tech. Journal, vol. 1, pp. 41-59, 1996.
14 P. Bender, P. Black, M. Grob, R. Padovani, N. Sindhushayana, and A. Viterbi, "CDMA/HDR: A bandwidth-efficient high-speed wireless data service for nomadic users," IEEE Commun. Mag., vol. 38, no. 7, pp. 70-77, July 2000.   DOI   ScienceOn
15 P. Viswanath, D. N. C. Tse, and R. Laroia, "Opportunistic beamforming Using Dumb Antennas," IEEE Trans. Inform. Theory, vol. 48, no. 6, pp. 1277-1294, June 2002.   DOI   ScienceOn