Computer Science – Information Theory
Scientific paper
2006-06-06
Computer Science
Information Theory
31 pages; submitted to IEEE Transactions on Signal Processing
Scientific paper
Feedback of quantized channel state information (CSI), called limited feedback, enables transmit beamforming in multiple-input-multiple-output (MIMO) wireless systems with a small amount of overhead. Due to its efficiency, beamforming with limited feedback has been adopted in several wireless communication standards. Prior work on limited feedback commonly adopts the block fading channel model where temporal correlation in wireless channels is neglected. This paper considers temporally-correlated channels and designs single-user transmit beamforming with limited feedback. Analytical results concerning CSI feedback are derived by modeling quantized CSI as a first-order finite-state Markov chain. These results include the source bit rate generated by time-varying quantized CSI, the required bit rate for a CSI feedback channel, and the effect of feedback delay. In particular, based on the theory of Markov chain convergence rate, feedback delay is proved to reduce the throughput gain due to CSI feedback at least exponentially. Furthermore, an algorithm is proposed for CSI feedback compression in time. Combining the results in this work leads to a new method for designing limited feedback beamforming as demonstrated by a design example.
Andrews Jeffrey G.
Heath Robert W. Jr.
Huang Kaibin
No associations
LandOfFree
Limited Feedback Beamforming Over Temporally-Correlated Channels does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Limited Feedback Beamforming Over Temporally-Correlated Channels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Limited Feedback Beamforming Over Temporally-Correlated Channels will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-3093