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Performance Evaluation of MIMO-UWB Systems Using Measured Propagation Data and Proposal of Timing Control Scheme in LOS Environments

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タイトル: Performance Evaluation of MIMO-UWB Systems Using Measured Propagation Data and Proposal of Timing Control Scheme in LOS Environments
著者: Takanashi, Masaki 著作を一覧する
Nishimura, Toshihiko 著作を一覧する
Ogawa, Yasutaka 著作を一覧する
Ohgane, Takeo 著作を一覧する
キーワード: MIMO-UWB
LOS (line-of-sight) environment
frequency-domain equalization
transmit and receive timing control
発行日: 2009年 8月 1日
出版者: IEICE - Institute of Electronics, Information and Communication Engineers
誌名: IEICE Transactions on Communications
巻: E92-B
号: 8
開始ページ: 2698
終了ページ: 2707
出版社 DOI: 10.1587/transcom.E92.B.2698
抄録: Ultrawide-band impulse radio (UWB-IR) technology and multiple-input multiple-output (MIMO) systems have attracted interest regarding their use in next-generation high-speed radio communication. We have studied the use of MIMO ultrawide-band (MIMO-UWB) systems to enable higher-speed radio communication. We used frequency-domain equalization based on the minimum mean square error criterion (MMSE-FDE) to reduce intersymbol interference (ISI) and co-channel interference (CCI) in MIMO-UWB systems. Because UWB systems are expected to be used for short-range wireless communication, MIMO-UWB systems will usually operate in line-of-sight (LOS) environments and direct waves will be received at the receiver side. Direct waves have high power and cause high correlations between antennas in such environments. Thus, it is thought that direct waves will adversely affect the performance of spatial filtering and equalization techniques used to enhance signal detection. To examine the feasibility of MIMO-UWB systems, we conducted MIMO-UWB system propagation measurements in LOS environments. From the measurements, we found that the arrival time of direct waves from different transmitting antennas depends on the MIMO configuration. Because we can obtain high power from the direct waves, direct wave reception is critical for maximizing transmission performance. In this paper, we present our measurement results, and propose a way to improve performance using a method of transmit (Tx) and receive (Rx) timing control. We evaluate the bit error rate (BER) performance for this form of timing control using measured channel data.
Rights: Copyright © 2009 The Institute of Electronics, Information and Communication Engineers
Relation (URI): http://search.ieice.org/
資料タイプ: article
URI: http://hdl.handle.net/2115/42605
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 大鐘 武雄

 

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