Ergodic Capacity Analysis and Adaptive Transsmion Scheme in Multi-user Distributed Antenna Systems  

作　　者：Xin Gui Gui-Xia Kang Xi-Dong Zhang Ping Zhang 

机构地区：[1]Wireless Technology Innovation Institute,Beijing University of Posts and Telecommunications [2]Key Laboratory of Universal Wireless Communications,Ministry of Education,Beijing University of Posts and Telecommunications

出　　处：《Journal of Harbin Institute of Technology(New Series)》2013年第1期28-33,共6页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the National High Technology Research and Development Program of China(Grant No.2006AA01Z272 and 2009AA02Z412);the Beijing Municipal Science & Technology Commission(Grant No.D08080100620802)

摘　　要：This paper focuses on analyzing the ergodic capacity performance of limited feedback (LFB) beamforming in multi-user distributed antenna system (DAS). In such a system, multi-user interference (MUI) is inevitably due to the channel uncertainties caused by quantization error. Considering this, we propose a parameter named effective ergodic capacity rate (EECR), which denotes the capacity offset between finite rate feedback and perfect channel state information (CSI). The simulation results show that the derived approximated EECR is very tight to actual EECR. Based on the approximated EECR, an adaptive minimum bit feedback scheme is proposed, which can effectively reduce the overhead of feedback channel and the complexity of the system. The simulation results verify the effectiveness of the proposed scheme.This paper focuses on analyzing the ergodic capacity performance of limited feedback （LFB） beamforming in multi-user distributed antenna system （DAS）. In such a system, multi-user interference （MUI） is inevitably due to the channel uncertainties caused by quantization error. Considering this, we propose a parameter named effective ergodic capacity rate （EECR）, which denotes the capacity offset between finite rate feedback and perfect channel state information （CSI）. The simulation results show that the derived approximated EECR is very tight to actual EECR. Based on the approximated EECR, an adaptive minimum bit feedback scheme is proposed, which can effectively reduce the overhead of feedback channel and the complexity of the system. The simulation results verify the effectiveness of the proposed scheme.

关 键 词：limited feedback distributed antenna system effective ergodic capacity rate (EECR) adaptive minimum bit feedback scheme 

分 类 号：TN92[电子电信—通信与信息系统]