A capacity-based RAU selection scheme for downlink transmission in distributed antenna system

Authors:
Xinsheng Zhao;Xiaohu You;Dingqian Zhu;Zhenggang Pan;Lan Chen
Affiliations:
Southeast University, Nanjing, China;Southeast University, Nanjing, China;Southeast University, Nanjing, China;DoCoMo Beijing Communications Laboratories Co., Ltd., Beijing, China;DoCoMo Beijing Communications Laboratories Co., Ltd., Beijing, China
Venue:
Proceedings of the 2006 international conference on Wireless communications and mobile computing
Year:
2006

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Abstract

As a promising wireless network structure, distributed antenna system (DAS) has recently attracted some investigations for its application in future wireless communication systems. Previous work had studied the performance of DAS in indoor and outdoor cellular mobile communications system and investigated signal transmit schemes and power allocation methods for DAS performance analysis. In this paper, we discuss the optimization problem of downlink channel capacity of DAS and analyze the downlink channel capacity in cellular and Manhattan scenarios. Based on the characteristics of nonlinear variation of downlink ergodic capacity with increase of transmitting remote antenna unit (RAU) number, a capacity based RAU selection (CBRS) scheme which combines optimal capacity RAU selection and power allocation is proposed for effective system control of downlink transmission in DAS. Simulation results show that the CBRS control scheme can achieve better capacity performance compared with blanket transmission and selection diversity schemes.