Broadband multibeam satellite systems; optimal linear precoding; sum rate maximization; multicast multigroup beamforming; per-antenna constraints; antenna power constraints; transmit; optimization; downlink
Abstract :
[en] The present work focuses on the forward link of a broadband multibeam satellite system that aggressively reuses the user link frequency resources. Two fundamental practical challenges, namely the need to frame multiple users per transmission and the per-antenna transmit power limitations, are addressed. To this end, the so-called frame-based precoding problem is optimally solved using the principles of physical layer multicasting to multiple co-channel groups under per-antenna constraints. In this context, a novel optimization problem that aims at maximizing the system sum rate under individual power constraints is proposed. Added to that, the formulation is further extended to include availability constraints. As a result, the high gains of the sum rate optimal design are traded off to satisfy the stringent availability requirements of satellite systems. Moreover, the throughput maximization with a granular spectral efficiency versus SINR function, is formulated and solved. Finally, a multicast-aware user scheduling policy, based on the channel state information, is developed. Thus, substantial multiuser diversity gains are gleaned. Numerical results over a realistic simulation environment exhibit as much as 30% gains over conventional systems, even for 7 users per frame, without modifying the framing structure of legacy communication standards.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Christopoulos, Dimitrios
Chatzinotas, Symeon ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT)
Ottersten, Björn ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT)
External co-authors :
yes
Language :
English
Title :
Multicast Multigroup Precoding and User Scheduling for Frame-Based Satellite Communications
Publication date :
2014
Journal title :
IEEE Transactions on Wireless Communications
ISSN :
1558-2248
Publisher :
IEEE
Volume :
14
Issue :
9
Pages :
4695--4707
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
National Research Fund, Luxembourg under the project "CO2SAT" National Research Fund, Luxembourg under the project "SATSENT" National Research Fund, Luxembourg under the project "SeMIGod" European Space Agency under "PreDem"