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MIMO Broadcast Channels With Finite-Rate Feedback (2006)
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BibTeX
@MISC{Jindal06mimobroadcast,
author = {Nihar Jindal},
title = { MIMO Broadcast Channels With Finite-Rate Feedback},
year = {2006}
}
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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 correspondence, 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 signal-to-noise ratio (SNR) (in decibels) in order to achieve the full multiplexing gain. This is in sharp contrast to point-to-point multiple-input multiple-output (MIMO) systems, in which it is not necessary to increase the feedback rate as a function of the SNR.
Keyphrases
finite-rate feedback mimo broadcast channel feedback rate key finding signal-to-noise ratio sharp contrast simple expression quantized information full multiplexing gain well-known zero-forcing transmission technique single antenna transmitter channel state information downlink channel tremendous capacity perfect channel knowledge channel instantiation multiple transmit antenna point-to-point multiple-input multiple-output throughput degradation
