Ktl-icon-tai-lieu

Performance Evaluation of a Multi-User MIMO System with Channel Prediction in Time - Varying Indoor Environments

Được đăng lên bởi Nguyen Trong
Số trang: 13 trang   |   Lượt xem: 2974 lần   |   Lượt tải: 0 lần
Performance Evaluation of a Multi-User MIMO System with Channel Prediction in TimeVarying Indoor Environments
Huu Phu Bui1, Yasutaka Ogawa2, Senior Member, IEEE, Toshihiko Nishimura2, Member,
IEEE, and Takeo Ohgane2, Member, IEEE
1 Hochiminh City University of Natural Sciences, Vietnam
2 Graduate School of Information Science and Technology, Hokkaido University, Japan.
Email: bhphu@fetel.hcmuns.edu.vn, {ogawa, nishim, ohgane}@m-icl.ist.hokudai.ac.jp
Abstract
In the paper, the performance of a multi-user multiple-input multiple-output (MIMO) system
in time-varying environments is evaluated using measurement data. We consider the multiuser MIMO system employing a block diagonalization (BD) scheme and an eigenbeam-space
division multiplexing (E-SDM) technique. In an ideal case, the BD scheme eliminates interuser interference, and the E-SDM technique suppresses inter-stream interference. In actual
radio environments, however, channels change in time. This causes interference in the multiuser MIMO system even though the BD scheme and the E-SDM technique are employed. To
overcome the problem, the authors have proposed a simple channel prediction scheme based
on a linear extrapolation, and have shown the effectivity by computer simulations assuming
the Jakes’ model in the previous reference. In order to verify the performance of the channel
prediction scheme in actual environments, we conducted a measurement campaign in indoor
environments, and measured a large amount of channel data. Using them, we examined the
channel transition and channel tracking with the prediction method. Then, we obtained the biterror rate (BER) performance. It has been shown that the prediction technique tracks the
channel and improves the BER performance almost to the ideal time invariant case.
Index Terms
Multi-user MIMO system, Block diagonalization, eigenbeam-space division multiplexing,
Time-varying environment, Channel prediction, Doppler frequency
Footnote:
The results in this paper will be presented in part at the 2010 IEEE Vehicular Technology
Conference (VTC2010-Fall), Ottawa, Canada, September 6-9, 2010.

I. INTRODUCTION
Multiple-input multiple-output (MIMO) systems have been extensively studied over the last
decade because they provide high data rate transmission without increasing the frequency
bandwidth [1], [2]. Attention is currently focused not only on single-user MIMO systems but
also on multi-user ones that accommodate multiple mobile stations (MSs) simultaneously [3]...
Performance Evaluation of a Multi-User MIMO System with Channel Prediction in Time-
Varying Indoor Environments
Huu Phu Bui
1
, Yasutaka Ogawa
2
, Senior Member, IEEE, Toshihiko Nishimura
2
, Member,
IEEE, and Takeo Ohgane
2
, Member, IEEE
1 Hochiminh City University of Natural Sciences, Vietnam
2 Graduate School of Information Science and Technology, Hokkaido University, Japan.
Email: bhphu@fetel.hcmuns.edu.vn, {ogawa, nishim, ohgane}@m-icl.ist.hokudai.ac.jp
Abstract
In the paper, the performance of a multi-user multiple-input multiple-output (MIMO) system
in time-varying environments is evaluated using measurement data. We consider the multi-
user MIMO system employing a block diagonalization (BD) scheme and an eigenbeam-space
division multiplexing (E-SDM) technique. In an ideal case, the BD scheme eliminates inter-
user interference, and the E-SDM technique suppresses inter-stream interference. In actual
radio environments, however, channels change in time. This causes interference in the multi-
user MIMO system even though the BD scheme and the E-SDM technique are employed. To
overcome the problem, the authors have proposed a simple channel prediction scheme based
on a linear extrapolation, and have shown the effectivity by computer simulations assuming
the Jakes’ model in the previous reference. In order to verify the performance of the channel
prediction scheme in actual environments, we conducted a measurement campaign in indoor
environments, and measured a large amount of channel data. Using them, we examined the
channel transition and channel tracking with the prediction method. Then, we obtained the bit-
error rate (BER) performance. It has been shown that the prediction technique tracks the
channel and improves the BER performance almost to the ideal time invariant case.
Index Terms
Multi-user MIMO system, Block diagonalization, eigenbeam-space division multiplexing,
Time-varying environment, Channel prediction, Doppler frequency
Footnote:
The results in this paper will be presented in part at the 2010 IEEE Vehicular Technology
Conference (VTC2010-Fall), Ottawa, Canada, September 6-9, 2010.
Performance Evaluation of a Multi-User MIMO System with Channel Prediction in Time - Varying Indoor Environments - Trang 2
Để xem tài liệu đầy đủ. Xin vui lòng
Performance Evaluation of a Multi-User MIMO System with Channel Prediction in Time - Varying Indoor Environments - Người đăng: Nguyen Trong
5 Tài liệu rất hay! Được đăng lên bởi - 1 giờ trước Đúng là cái mình đang tìm. Rất hay và bổ ích. Cảm ơn bạn!
13 Vietnamese
Performance Evaluation of a Multi-User MIMO System with Channel Prediction in Time - Varying Indoor Environments 9 10 49