TY - GEN
T1 - Transmit beamforming for wireless multicasting using channel orthogonalization and local refinement
AU - Abdelkader, Ahmed
AU - Wajid, Imran
AU - Gershman, Alex B.
AU - Sidiropoulos, Nicholas D.
PY - 2009
Y1 - 2009
N2 - The problem of transmit beamforming for single-group multicasting is considered, where the objective is to transmit common information to a (large) number of users. The transmitter is assumed to have accurate downlink channel state information (CSI) for all users, and the objective is to design the beamformer weights to minimize the total transmitted power subject to meeting the quality-of-service (QoS) constraints of all users. This is an NP-hard problem that has recently drawn considerable interest (e.g., in the context of UMTSLTE / E-MBMS). Several channel orthogonalization-based methods are proposed to solve this problem in an approximate way. Our techniques are shown to offer an improved performance-to-complexity tradeoff as compared to the original semidefinite relaxation (SDR) based multicasting technique.
AB - The problem of transmit beamforming for single-group multicasting is considered, where the objective is to transmit common information to a (large) number of users. The transmitter is assumed to have accurate downlink channel state information (CSI) for all users, and the objective is to design the beamformer weights to minimize the total transmitted power subject to meeting the quality-of-service (QoS) constraints of all users. This is an NP-hard problem that has recently drawn considerable interest (e.g., in the context of UMTSLTE / E-MBMS). Several channel orthogonalization-based methods are proposed to solve this problem in an approximate way. Our techniques are shown to offer an improved performance-to-complexity tradeoff as compared to the original semidefinite relaxation (SDR) based multicasting technique.
KW - Channel orthogonalization
KW - Multicasting
KW - Transmit beamforming
UR - http://www.scopus.com/inward/record.url?scp=70349195954&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70349195954&partnerID=8YFLogxK
U2 - 10.1109/ICASSP.2009.4960075
DO - 10.1109/ICASSP.2009.4960075
M3 - Conference contribution
AN - SCOPUS:70349195954
SN - 9781424423545
T3 - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
SP - 2281
EP - 2284
BT - 2009 IEEE International Conference on Acoustics, Speech, and Signal Processing - Proceedings, ICASSP 2009
T2 - 2009 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2009
Y2 - 19 April 2009 through 24 April 2009
ER -