Opportunistic Feedback and Online Optimization for Multiuser MIMO Systems with Linear Receivers

Authors:

Taiwen Tang, Robert W. Heath Jr., Sunghyun Cho, and Sangboh Yun.

Reference:

Proc. of IEEE Asilomar Conference on Signals, Systems, and Computers,  Oct. 30-Nov. 1, 2006 (Invited paper)

Abstract:

This paper proposes a scheduling and feedback strategy for the multiuser multiple input multiple output (MIMO) downlink. The base station uses a per-antenna scheduling that maps each transmit antenna to a different user in the downlink. The scheduling is performed based on the channel information obtained via a contention based feedback mechanism. Two design parameters, i.e., a channel quality threshold and a feedback probability, are proposed to adjust the scheduling and feedback behavior of this system. They are updated through a novel online updating procedure using empirically observed distribution infor- mation. The main advantages of the proposed protocol are that it substantially reduces the feedback requirements, still achieves multiuser diversity gain, and provides some fairness without a priori assumptions about the channel distribution.

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