TY - GEN
T1 - Optimized training and feedback for MIMO downlink channels
AU - Kobayashi, Mari
AU - Jindal, Nihar
AU - Caire, Giuseppe
PY - 2009
Y1 - 2009
N2 - 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 zeroforcing 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 eedback.
AB - 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 zeroforcing 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 eedback.
UR - http://www.scopus.com/inward/record.url?scp=77950658482&partnerID=8YFLogxK
U2 - 10.1109/ITWNIT.2009.5158576
DO - 10.1109/ITWNIT.2009.5158576
M3 - Conference contribution
AN - SCOPUS:77950658482
SN - 9781424445363
T3 - Proceedings - 2009 IEEE Information Theory Workshop on Networking and Information Theory, ITW 2009
SP - 226
EP - 230
BT - Proceedings - 2009 IEEE Information Theory Workshop on Networking and Information Theory, ITW 2009
T2 - 2009 IEEE Information Theory Workshop on Networking and Information Theory, ITW 2009
Y2 - 10 June 2009 through 12 June 2009
ER -