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MIMO broadcast channels with finite rate feedback (2006)
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| Venue: | IEEE Trans. on Inform. Theory |
| Citations: | 155 - 10 self |
BibTeX
@ARTICLE{Jindal06mimobroadcast,
author = {Nihar Jindal},
title = {MIMO broadcast channels with finite rate feedback},
journal = {IEEE Trans. on Inform. Theory},
year = {2006},
volume = {52},
pages = {5045--5059}
}
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Abstract
Multiple transmit antennas in a downlink channel can provide tremendous capacity (i.e. multiplexing) gains, even when receivers have only single antennas. However, receiver and transmitter channel state information is generally required. In this paper, a system where each receiver has perfect channel knowledge, but the transmitter only receives quantized information regarding the channel instantiation is analyzed. The well known zero forcing transmission technique is considered, and simple expressions for the throughput degradation due to finite rate feedback are derived. A key finding is that the feedback rate per mobile must be increased linearly with the SNR (in dB) in order to achieve the full multiplexing gain, which is in sharp contrast to point-to-point MIMO systems in which it is not necessary to increase the feedback rate as a function of the SNR. I.
Keyphrases
mimo broadcast channel finite rate feedback feedback rate key finding rate feedback multiple transmit antenna simple expression quantized information full multiplexing gain tremendous capacity single antenna transmitter channel state information downlink channel perfect channel knowledge channel instantiation transmission technique sharp contrast throughput degradation point-to-point mimo system
