References of "Mosquera, Carlos"
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See detailLink Adaptation and SINR errors in Practical Multicast Multibeam Satellite Systems with Linear Precoding
Tato, Anxo; Andrenacci, Stefano UL; Lagunas, Eva UL et al

in International Journal of Satellite Communications and Networking (2020)

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See detailLink Adaptation and CSI Detection Errors in Multibeam Satellite Systems with Linear Precoding
Tato, Anxo; Andrenacci, Stefano UL; Chatzinotas, Symeon UL et al

in 2018 9th Advanced Satellite Multimedia Systems Conference and the 15th Signal Processing for Space Communications Workshop (ASMS/SPSC) (2018)

The application of linear precoding at the gateway side enables broadband multibeam satellite systems to use more aggressive frequency reuse patterns increasing the overall capacity of future High ... [more ▼]

The application of linear precoding at the gateway side enables broadband multibeam satellite systems to use more aggressive frequency reuse patterns increasing the overall capacity of future High Throughput Satellites (HTS). However, although some previous works about precoding consider imperfect CSIT (Chanel State Information at the Transmitter) adding some CSI estimation errors, that is not the main cause of CSI degradation. In practice, receivers can only detect and estimate a few coefficients of the CSI vector being the other nullified, replaced by zeros. This introduces errors in the SINR calculation by the gateway that lead to the assignment of Modulation and Coding Schemes (MCS) over the decoding possibilities of the users, increasing the rate of erroneous frames. In this work, the errors in the SINR calculation caused by the nullification of the CSI are analyzing statistically and geographically using a radiation diagram of 245 beams over Europe. Furthermore, a solution based on a link adaptation algorithm with a per user adaptive margin is proposed, helping to achieve the QEF (Quasi-error Free) target of DVB-S2X systems. [less ▲]

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See detailAdvanced Signal Processing Techniques for Fixed and Mobile Satellite Communications
Henarejos, Pol; Pérez Neira, Ana; Mazzali, Nicolò UL et al

in Proceedings on 8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop (2016, September)

Enabling ultra fast systems has been widely investigated during recent decades. Although polarization has been deployed from the beginning in satellite communications, nowadays it is being exploited to ... [more ▼]

Enabling ultra fast systems has been widely investigated during recent decades. Although polarization has been deployed from the beginning in satellite communications, nowadays it is being exploited to increase the throughput of satellite links. More precisely, the application of diversity techniques to the polarization domain may provide reliable, robust, and fast satellite communications. Better and more flexible spectrum use is also possible if transmission and reception can take place simultaneously in close or even overlapping frequency bands. In this paper we investigate novel signal processing techniques to increase the throughput of satellite communications in fixed and mobile scenarios. First, we investigate four-dimensional (4D) constellations for the forward link. Second, we focus on the mobile scenario and introduce an adaptive algorithm which selects the optimal tuple of modulation order, coding rate, and MIMO scheme that maximizes the throughput constraint to a maximum packet error rate. Finally, we describe the operation of radio transceivers which cancel actively the self-interference posed by the transmit signal when operating in full-duplex mode. [less ▲]

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See detailPushing for higher rates and efficiency in Satcom: the different perspectives within SatNExIV
Vazquez, Miguel-Angel; Neira, Ana-Perez; Mosquera, Carlos et al

in Proceedings of the 11th International Symposium on Wireless Communication Systems (ISWCS 2015) (2015)

SatNEx IV project aims at studying medium and long term directions of satellite telecommunication systems for any of the commercial or institutional applications that can be considered appealing by key ... [more ▼]

SatNEx IV project aims at studying medium and long term directions of satellite telecommunication systems for any of the commercial or institutional applications that can be considered appealing by key players although still not mature enough for attracting industry or initiating dedicated ESA R&D activities. This paper summarizes the first year activities identified as very promising techniques for next generation satellite communication systems. Concretely, very high throughput satellite trunking, physical layer advances for fullduplex and multipolarization systems, network coding applications and multiple access schemes for information centric networking are briefly presented. For all the activities, we identify the scenarios under study so as the preliminary technical solutions to be further investigated. [less ▲]

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See detailMMSE Performance Analysis of Generalized Multibeam Satellite Channels
Christopoulos, Dimitrios UL; Arnau, Jesus; Chatzinotas, Symeon UL et al

in IEEE Wireless Communications Letters (2013), 17(7), 1332-1335

Detailed reference viewed: 242 (21 UL)