Experimental evaluation of analog eigenmode transmission for short-range MIMO: array parameter independency and wideband characteristics

• Murata Kentaro

  Graduate School of Science and Engineering, National Defense Academy

• Honma Naoki

  Faculty of Engineering, Iwate University

• Tsunezawa Masakuni

  Faculty of Engineering, Iwate University

• Nishimori Kentaro

  Faculty of Engineering, Niigata University

• Morishita Hisashi

  Graduate School of Science and Engineering, National Defense Academy

Abstract

We proposed an analog eigenmode transmission technique, that realizes multi-stream parallel transmission in a short-range multiple-input multiple-output (SR-MIMO) communication using only 180-degree hybrid couplers. Provided the MIMO array is symmetric, this technique can orthogonalize MIMO channels independently of antenna spacing and Tx-Rx distance. Furthermore, due to wideband characteristics of a hybrid, the channel orthogonalization effect can hold over a broad band of frequencies. In this letter, its array parameter independency and wideband characteristics are quantitatively evaluated in term of channel capacity. It has been experimentally clarified that this technique achieves approximately 90-% performance of ideal eigenbeam space division multiplexing (E-SDM) by digital-beamforming despite the deviations of the above factors.

Journal

• IEICE Communications Express

  IEICE Communications Express 4 (6), 198-204, 2015

  The Institute of Electronics, Information and Communication Engineers

Keywords

• short-range MIMO
• eigenmode transmission
• passive analog circuit

Details

• CRID: 1390282680393643392
• NII Article ID: 130005078699
• DOI: 10.1587/comex.4.198
• ISSN: 21870136
• Web Site: https://www.jstage.jst.go.jp/article/comex/4/6/4_198/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed