Reference : Non-Orthogonal Multicast and Unicast Robust Beamforming in Integrated Terrestrial-Sat...

	Document type :	Scientific congresses, symposiums and conference proceedings : Paper published in a book
	Discipline(s) :	Engineering, computing & technology : Computer science
	Focus Areas :	Security, Reliability and Trust
	To cite this reference:	http://hdl.handle.net/10993/53394

Title :	Non-Orthogonal Multicast and Unicast Robust Beamforming in Integrated Terrestrial-Satellite Networks
Language :	English
Author, co-author :	Peng, Deyi []
	Domouchtsidis, Stavros [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom >]
	Chatzinotas, Symeon [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom >]
	Li, Yu []
	Ottersten, Björn [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > >]
Publication date :	2022
Main document title :	IEEE Global Communications Conference
Publisher :	IEEE
Peer reviewed :	Yes
Audience :	International
Country :	USA
Event name :	IEEE Global Communications Conference
Event date :	04-12-2022 to 08-12-2022
Event place (city) :	Rio de Janeiro
Event country :	Brazil
Abstract :	[en] This paper studies the non-orthogonal multicast and unicast coordinated beamforming design for integrated terrestrial and satellite networks (ITSN), when the channel state information at the transmitter (CSIT) is imperfect. In order to mitigate the interference induced by simultaneous multicast and unicast links along with the spectrum coexisting mechanism for integrated terrestrial and satellite transmissions, we consider a two-layer layered division multiplexing (LDM) structure where the mul ticast and unicast services are provided in different layers. We formulate a coordinated beamforming problem with the objective to minimize the transmit power under individual quality of service (QoS) constraints. With regard to the unknown convexity of the transmit power minimization problem, we transform the original infeasible optimization into a deterministic optimization form with linear matrix inequality (LMI) by utilizing S-procedure and semi-definite relaxation (SDR) methods. Then, we introduce a penalty function and propose an iterative algorithm with guaranteed convergence to obtain optimal solutions. Simulation results demonstrate the superiority of the proposed coordinated beamforming scheme, especially for the case of imperfect CSIT, while our LDM based coordinated beamforming scheme signifi cantly outperforms the conventional ones in terms of sum rate. Index Terms—Integrated terrestrial and satellite networks (IT SN), beamforming, robust, layered division multiplexing (LDM)
Permalink :	http://hdl.handle.net/10993/53394

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