Maria Angeles Vázquez-Castro

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In this paper, a statistical model for the land mobile satellite (LMS) channel is presented. The model is capable of describing both narrowand wide-band conditions. Other relevant characteristic is that it can be used to study links with geostationary as well as nongeostationary satellites. The model is of the generative type, i.e., it is capable of(More)
Adaptability of the physical layer has become mandatory for unicast services by the second generation of the DVB-S standard, DVB-S2. This introduces new challenges as well as degrees of freedom in the design of the packet schedulers operating on the forward link. A main challenge lies in providing quality-ofservice (QoS) suitable for multimedia applications(More)
In this paper, a novel cross-layer framework for optimizing the dynamic bandwidth allocation (DBA) of a digital video broadcast (DVB)-return channel satellite (RCS) system using adaptive coding is proposed. The design of the medium access control (MAC) methods taking into account the adaptive physical layer and higher layers’ quality of service (QoS)(More)
Current multibeam satellite systems perform centralized power and carrier allocation assuming a Multi-Frequency Time Division Multiple Access (MF-TDMA) scheme with fixed regular frequency reuse. This approach is not optimal when individual SINR constraints are to be met. In this paper, we formulate the problem of joint power and carrier allocation allowing(More)
In this paper, we investigate two new candidate transmission schemes, non-orthogonal frequency reuse (NOFR) and beam- hopping (BH). They operate in different domains (frequency and time/space, respectively), and we want to know which domain shows overall best performance. We propose a novel formulation of the signal-to-interference plus noise ratio (SINR)(More)