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IEICE Transactions on Communications 2007 E90-B(12):3695-3698; doi:10.1093/ietcom/e90-b.12.3695
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Copyright © 2007 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Letters -- Wireless Communication Technologies

Adaptive Receive Antenna Selection for Orthogonal Space-Time Block Codes with Imperfect Channel Estimation*

Kai ZHANG1 and Zhisheng NIU1

1 The authors are with Tsinghua National Laboratory for Information Science and Technology (TNList), Department of Electronic Engineering, Tsinghua University, Beijing 100084, China. E-mail: zhangkai98{at}mails.tsinghua.edu.cn; niuzhs{at}tsinghua.edu.cn


  Abstract

For coherent detection, decoding Orthogonal Space-Time Block Codes (OSTBC) requires full channel state information at the receiver, which basically is obtained by channel estimation. However, in practical systems, channel estimation errors are inevitable and may degrade the system performance more as the number of antennas increases. This letter shows that, using fewer receive antennas can enhance the performance of OSTBC systems in presence of channel estimation errors. Furthermore, a novel adaptive receive antenna selection scheme, which adaptively adjusts the number of receive antennas, is proposed. Performance evaluation and numerical examples show that the proposed scheme improves the performance obviously.

Key Words: orthogonal space-time block codes, imperfect channel estimation, receive antenna selection

Manuscript received September 13, 2006. Manuscript revised April 29, 2007.

* This paper has been partially presented at IEEE Globecom 2005, St. Louis, USA, Nov. 2005.


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