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JSAC
2007

Multi-Antenna Downlink Channels with Limited Feedback and User Selection

9 years 1 months ago
Multi-Antenna Downlink Channels with Limited Feedback and User Selection
Abstract— We analyze the sum-rate performance of a multiantenna downlink system carrying more users than transmit antennas, with partial channel knowledge at the transmitter due to finite rate feedback. In order to exploit multiuser diversity, we show that the transmitter must have, in addition to directional information, information regarding the quality of each channel. Such information should reflect both the channel magnitude and the quantization error. Expressions for the SINR distribution and the sum-rate are derived, and tradeoffs between the number of feedback bits, the number of users, and the SNR are observed. In particular, for a target performance, having more users reduces feedback load.
Taesang Yoo, Nihar Jindal, Andrea J. Goldsmith
Added 16 Dec 2010
Updated 16 Dec 2010
Type Journal
Year 2007
Where JSAC
Authors Taesang Yoo, Nihar Jindal, Andrea J. Goldsmith
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