Optimized training and feedback for MIMO downlink channels

We consider a MIMO fading broadcast channel where channel state information is acquired at user terminals via downlink training and channel feedback is used to provide transmitter channel state information (CSIT) to the base station. The feedback channel (the corresponding uplink) is modeled as an A...

Full description

Saved in:
Bibliographic Details
Published in2009 IEEE Information Theory Workshop on Networking and Information Theory pp. 226 - 230
Main Authors Kobayashi, M., Jindal, N., Caire, G.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2009
Subjects
AWGN channels
Bandwidth
Base stations
Broadcasting
Channel state information
Downlink
Fading
MIMO
State feedback
Transmitters
Online AccessGet full text
ISBN1424445353
9781424445356
DOI10.1109/ITWNIT.2009.5158576

Cover

More Information
Summary:We consider a MIMO fading broadcast channel where channel state information is acquired at user terminals via downlink training and channel feedback is used to provide transmitter channel state information (CSIT) to the base station. The feedback channel (the corresponding uplink) is modeled as an AWGN channel, orthogonal across users. The total bandwidth consumed is the sum of the bandwidth/resources used for downlink training, channel feedback, and data transmission. Assuming that the channel follows a block fading model and that zero-forcing beamforming is used, we optimize the net achievable rate for unquantized (analog) and quantized (digital) channel feedback. The optimal number of downlink training pilots is seen to be essentially the same for both feedback techniques, but digital feedback is shown to provide a larger net rate than analog feedback.
ISBN:1424445353
9781424445356
DOI:10.1109/ITWNIT.2009.5158576