Paper Info
Title
Delay-limited capacity of MIMO channels with limited feedback
Abstract
We consider a fixed data rate slow-fading MIMO channel with a long-term power constraint P at the transmitter. A relevant performance limit is the delay-limited capacity, which is the largest data rate at which the outage probability is zero. It is well-known that if both the transmitter and the receiver have full channel state information (CSI) and if either of them has multiple antennas, the delay-limited capacity is non-zero and grows logarithmically with P. Achieving even a positive delay-limited capacity however becomes a difficult task when the CSI at the transmitter (CSIT) is imperfect. In this context, the standard partial CSIT model where the transmitter has a fixed finite bits of quantized CSI feedback for each channel state results in zero delay-limited capacity. We show that by using a variable-length feedback scheme that utilizes different number of feedback bits for different channel states, a non-zero delay-limited capacity can be achieved if the feedback rate is greater than 1 bit per channel state. Moreover, we show that the delay-limited capacity loss due to finite-rate feedback decays at least inverse linearly with respect to the feedback rate.
Year
DOI
Venue
2014
10.1109/ISIT.2014.6875294
Information Theory
Keywords
Field
DocType
MIMO communication,channel capacity,error statistics,fading channels,feedback,multifrequency antennas,radio receivers,radio transmitters,wireless channels,CSI at the transmitter,CSI feedback quantization,channel state information,delay limited capacity loss,feedback bits,finite bits,finite rate feedback decay,limited feedback,multiple antenna,nonzero delay limited capacity,outage probability,power constraint,receiver,slow fading MIMO channel,standard partial CSIT model,variable length feedback scheme
Discrete mathematics,3G MIMO,Mimo channel,Computer science,Control theory,MIMO,Electronic engineering,Precoding
Conference
Citations 
PageRank 
References 
0
0.34
6
Authors
2
Name
Order
Citations
PageRank
Erdem Koyuncu101.35
Hamid Jafarkhani27037695.30