TY - GEN
T1 - On multicast beamforming and admission control for UMTS-LTE
AU - Matskani, E.
AU - Sidiropoulos, N. D.
AU - Tassiulas, L.
PY - 2008/9/16
Y1 - 2008/9/16
N2 - Transmit beamforming for physical layer multicasting is emerging as an appealing transmission modality for next-generation cellular wireless systems, notably UMTS-LTE. Optimal design of the transmit beamformer(s) from a quality of service perspective is a hard computational problem; however, convex approximation tools have been shown to yield high-quality approximate solutions. Recently, Lozano proposed a particularly simple adaptive multicast beamforming algorithm that aims to serve a certain percentage of users. In parallel, convex approximation algorithms were developed for the more general problem of joint co-channel multicast beamforming and admission control. In this paper, we focus on the important (in view of recent standardization activity) special case of a single multicast group, and put the two approaches to the test. Through simple examples, we pinpoint issues regarding convergence of Lozano's algorithm. In numerical experiments with measured channel data, we show that a convex approximation approach is preferable performance-wise. At the same time, we find merits in the simplicity of Lozano's approach, and suggest a way to improve its performance.
AB - Transmit beamforming for physical layer multicasting is emerging as an appealing transmission modality for next-generation cellular wireless systems, notably UMTS-LTE. Optimal design of the transmit beamformer(s) from a quality of service perspective is a hard computational problem; however, convex approximation tools have been shown to yield high-quality approximate solutions. Recently, Lozano proposed a particularly simple adaptive multicast beamforming algorithm that aims to serve a certain percentage of users. In parallel, convex approximation algorithms were developed for the more general problem of joint co-channel multicast beamforming and admission control. In this paper, we focus on the important (in view of recent standardization activity) special case of a single multicast group, and put the two approaches to the test. Through simple examples, we pinpoint issues regarding convergence of Lozano's algorithm. In numerical experiments with measured channel data, we show that a convex approximation approach is preferable performance-wise. At the same time, we find merits in the simplicity of Lozano's approach, and suggest a way to improve its performance.
KW - Admission control
KW - Beamforming
KW - Multicasting
KW - UMTS-LTE
UR - http://www.scopus.com/inward/record.url?scp=51449087742&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=51449087742&partnerID=8YFLogxK
U2 - 10.1109/ICASSP.2008.4518121
DO - 10.1109/ICASSP.2008.4518121
M3 - Conference contribution
AN - SCOPUS:51449087742
SN - 1424414849
SN - 9781424414840
T3 - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
SP - 2361
EP - 2364
BT - 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP
T2 - 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP
Y2 - 31 March 2008 through 4 April 2008
ER -