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2011

Multi-Mode Transmission for the MIMO Broadcast Channel with Imperfect Channel State Information

7 years 10 months ago
Multi-Mode Transmission for the MIMO Broadcast Channel with Imperfect Channel State Information
This paper proposes an adaptive multi-mode transmission strategy to improve the spectral efficiency achieved in the multiple-input multiple-output (MIMO) broadcast channel with delayed and quantized channel state information. The adaptive strategy adjusts the number of active users, denoted as the transmission mode, to balance transmit array gain, spatial division multiplexing gain, and residual interuser interference. Accurate closed-form approximations are derived for the achievable rates for different modes, which help identify the active mode that maximizes the average sum throughput for given feedback delay and channel quantization error. The proposed transmission strategy is combined with round-robin scheduling, and is shown to provide throughput gain over single-user MIMO at moderate signal-to-noise ratio. It only requires feedback of instantaneous channel state information from a small number of users. With a feedback load constraint, the proposed algorithm provides performan...
Jun Zhang, Marios Kountouris, Jeffrey G. Andrews,
Added 15 May 2011
Updated 15 May 2011
Type Journal
Year 2011
Where TCOM
Authors Jun Zhang, Marios Kountouris, Jeffrey G. Andrews, Robert W. Heath Jr.
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