Capacity bounds of transmit beamforming over MISO time-varying channels with imperfect feedback

作     者：ZHANG Lei1,2, WU Gang1* & LI ShaoQian1 1National Key Lab on Communication, University of Electronic Science and Technology of China, Chengdu 610054, China 2Alcatel-Lucent Shanghai Bell Co. Ltd, Shanghai 201206, China 

作者机构：1. National Key Lab on Communication University of Electronic Science and Technology of China Chengdu 610054 China2. Alcatel-Lucent Shanghai Bell Co. Ltd Shanghai 201206 China 

出 版 物：《Science China(Information Sciences)》 (中国科学:信息科学(英文版))

年 卷 期：2010年第53卷第7期

页      面：1417-1430页

核心收录：

学科分类：0810[工学-信息与通信工程] 08[工学] 081001[工学-通信与信息系统] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 60496313,60702073) the National Basic Research Program of China (Grant No. 2007CB310604) the National Science and Technology Major Project (Grant No. 2008ZX03002-003) 

主　　题：beamforming capacity bounds channel estimation error feedback delay time-varying channels 

摘      要：In wireless multiple input single output (MISO) systems, transmit beamforming using feedback of quantized channel state information (CSI) can provide both diversity gain and array gain with simple imple- mentation. Most of previous researches include several ideal assumptions, such as block-fading channels, perfect CSI at the receiver, or error-free and zero-delay feedback link. This paper investigates a more realistic Jakes’ time-varying MISO Rayleigh fading channel with CSI estimation error and feedback delay, derives the upper and lower bounds on the ergodic capacity, and obtains the optimal frame length according to the capacity lower bound given the normalized feedback bits. The numerical and simulation results show that the derived upper and lower bounds on the capacity is quite close, increasing channel estimation error or Doppler spread will reduce the capacity bounds, and the optimal frame length can maximize the capacity lower bound.