Πλοήγηση ανά Συγγραφέα "Sidiropoulos, N. D."
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Convex Approximation Algorithms for Back-Pressure Power Control
Matskani, E.; Sidiropoulos, N. D.; Tassiulas, L. (2012)Throughput-optimal multihop wireless network operation entails a key physical-layer optimization problem: maximizing a weighted sum of link rates, with weights given by the differential queue backlogs. This emerges in joint ... -
Convex approximation algorithms for back-pressure power control of wireless multi-hop networks
Matskani, E.; Sidiropoulos, N. D.; Tassiulas, L. (2011)Cross-layer design and operation of wireless networks has attracted significant interest in the last decade, yet some basic problems in the area remain unsolved. In this paper, we consider the joint routing and power control ... -
Convex approximation techniques for joint multiuser downlink beamforming and admission control
Matskani, E.; Sidiropoulos, N. D.; Luo, Z. Q.; Tassiulas, L. (2008)Multiuser downlink beamforming under quality of service (QoS) constraints has attracted considerable interest in recent years, because it is particularly appealing from a network operator's perspective (e.g., UNITS, 802.16e). ... -
Distributed back-pressure power control for wireless multi-hop networks
Matskani, E.; Sidiropoulos, N. D.; Tassiulas, L. (2012)A key problem in wireless networking is how to choose a link activation schedule and associated powers in concert with routing decisions to optimize throughput. Back-pressure control policies are optimal in this context, ... -
Efficient Batch and Adaptive Approximation Algorithms for Joint Multicast Beamforming and Admission Control
Matskani, E.; Sidiropoulos, N. D.; Luo, Z. Q.; Tassiulas, L. (2009)Wireless multicasting is becoming increasingly important for efficient distribution of streaming media and location-aware services to mobile and hand-held devices, network management, and software updates over cellular ... -
Joint multicast beamforming and admission control
Matskani, E.; Sidiropoulos, N. D.; Luo, Z. Q.; Tassiulas, L. (2007)Wireless multicasting is quickly emerging as an important enabling technology for mass content distribution to mobile hand-held devices. With channel state information at the transmitter, it is possible to tailor transmissions ... -
Joint multiuser downlink beamforming and admission control: A semidefinite relaxation approach
Matskani, E.; Sidiropoulos, N. D.; Luo, Z. Q.; Tassiulas, L. (2007)Multiuser downlink beamforming under quality of service (QoS) constraints has attracted considerable interest in recent years, because it is particularly appealing from a network operator's perspective (e.g., UMTS, 802.16e). ... -
Joint QoS multicast power / admission control and base station assignment: A geometric programming approach
Karipidis, E.; Sidiropoulos, N. D.; Tassiulas, L. (2008)The joint power control and base station (BS) assignment problem is considered under Quality-of-Service (QoS) constraints. If a feasible solution exists, the problem can be efficiently solved using existing distributed ... -
On multicast beamforming and admission control for UMTS-LTE
Matskani, E.; Sidiropoulos, N. D.; Tassiulas, L. (2008)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 ... -
On Multicast Beamforming for Minimum Outage
Ntranos, V.; Sidiropoulos, N. D.; Tassiulas, L. (2009)The multicast beamforming problem is considered from the viewpoint of minimizing outage probability subject to a transmit power constraint. The main difference with the point-to-point transmit beamforming problem is that ... -
A second-order cone deflation approach to joint multiuser downlink beamforming and admission control
Matskani, E.; Sidiropoulos, N. D.; Luo, Z. Q.; Tassiulas, L. (2007)Multiuser downlink beamforming under quality of service (QoS) constraints has attracted considerable interest in recent years, because it is particularly appealing from a network operator's perspective (e.g., UMTS, 802.16e). ...