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IEICE Transactions on Communications 2008 E91-B(2):479-487; doi:10.1093/ietcom/e91-b.2.479
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Wireless Communication Technologies

Partial CSI Reporting for Spatial Scheduling in Multiuser MIMO Systems

Yoshitaka HARA1 and Kazuyoshi OSHIMA2

1 The author is with Mitsubishi Electric Corporation, Kamakura-shi, 247-8501 Japan. E-mail: Hara.Yoshitaka{at}cs.MitsubishiElectric.co.jp, 2 The author is with Mitsubishi Electric Information Technology Centre Europe B.V. (ITE)., 1, allée de Beaulieu, CS 10806, 35708 Rennes Cedex 7, France.


  Abstract

This paper proposes a new partial channel state information (CSI) reporting method for spatial scheduling in TDD/MIMO systems. In the proposed method, a terminal transmits pilot signals using transmit beams which have large channel gains between the base station (BS) and the terminal. Then, the BS can obtain partial CSI through responses of the pilot signals. Furthermore, adaptive allocation of pilot signals is proposed, in which pilot signals for CSI reporting are adaptively allocated to terminals depending on the number of terminals. We evaluate system throughput of spatial scheduling under the partial CSI reporting from multiple terminals. Numerical results show that the proposed method reduces uplink signalling for CSI reporting effectively, keeping high system throughput of spatial scheduling.

Key Words: wireless communications, multiuser MIMO, partial channel state information, spatial scheduling, throughput

Manuscript received March 12, 2007. Manuscript revised August 7, 2007.


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