Limited feedback design for MIMO broadcast channels with ARQ mechanism

Authors:
Wei Xu;Chunming Zhao;Zhi Ding
Affiliations:
National Mobile Communications Research Lab., Southeast University, Nanjing, China;National Mobile Communications Research Lab., Southeast University, Nanjing, China;Dept. of Electrical & Computer Engineering, University of California, Davis, CA
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

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Abstract

We investigate the design of a limited feedback mechanism for multiple-input-multiple-output (MIMO) broadcast systems that are equipped with automatic repeat request (ARQ) capabilities. Given multiple antennas at the base-station (BS) and single antenna subscribers, we focus on maximizing the ergodic system sum capacity and propose an adaptive feedback bit allocation scheme under the constraint of total feedback bandwidth. Furthermore, we develop two efficient feedback allocation schemes based on asymptotic analysis. We present simulation results that verify the effectiveness of the proposed adaptive allocation schemes.