TY - GEN
T1 - Random beamforming using low feedback and low latency power allocation
AU - Tsuchiyat, Yuki
AU - Ohtsuki, Tomoaki
AU - Kaneko, Toshinobu
PY - 2007/12/1
Y1 - 2007/12/1
N2 - Random unitary beamforming is one of the schemes reducing the amount of feedback information in multiuser diversity techniques with multiple-antenna downlink transmission. In Multiple-Input Multiple-Output (MIMO) systems, throughput performance is greatly improved using AMC (Adaptive Modulation and Coding). Throughput performance is also improved by allocating power among streams appropriately. In random unitary beamforming, transmitter has only partial channel state information (CSI) of each receiver because of reducing the amount of feedback information. Thus, the power allocation scheme needs to work with only partial CSI and low latency. In this paper, we propose a new power allocation scheme for random unitary beamforming assuming a discrete transmission rate with a small amount of feedback information and low latency. Simulation results show that the proposed scheme can improve throughput compared to conventional power allocation scheme.
AB - Random unitary beamforming is one of the schemes reducing the amount of feedback information in multiuser diversity techniques with multiple-antenna downlink transmission. In Multiple-Input Multiple-Output (MIMO) systems, throughput performance is greatly improved using AMC (Adaptive Modulation and Coding). Throughput performance is also improved by allocating power among streams appropriately. In random unitary beamforming, transmitter has only partial channel state information (CSI) of each receiver because of reducing the amount of feedback information. Thus, the power allocation scheme needs to work with only partial CSI and low latency. In this paper, we propose a new power allocation scheme for random unitary beamforming assuming a discrete transmission rate with a small amount of feedback information and low latency. Simulation results show that the proposed scheme can improve throughput compared to conventional power allocation scheme.
UR - http://www.scopus.com/inward/record.url?scp=47649127851&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=47649127851&partnerID=8YFLogxK
U2 - 10.1109/VETECF.2007.96
DO - 10.1109/VETECF.2007.96
M3 - Conference contribution
AN - SCOPUS:47649127851
SN - 1424402646
SN - 9781424402649
T3 - IEEE Vehicular Technology Conference
SP - 402
EP - 406
BT - 2007 IEEE 66th Vehicular Technology Conference, VTC 2007-Fall
T2 - 2007 IEEE 66th Vehicular Technology Conference, VTC 2007-Fall
Y2 - 30 September 2007 through 3 October 2007
ER -