Now showing items 1-17 of 17

    • Autonomous design for the MISO interference channel 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A.; Vázquez, Miguel Ángel (2011)
      Conference report
      Restricted access - publisher's policy
      This paper investigates the power control and beamforming design in the MISO-IC (Multiple Input Single Output-Interference Channel) when constraints are placed at the receivers’ input power. In this way regulatory ...
    • Confidential communication in downlink beamforming 

      Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (2012)
      Conference report
      Restricted access - publisher's policy
      This paper deals with the problem of secure transmission in downlinkbeamforming. In this scenario, a base station, which usually serves information to an amount of users, wants to transmit a confidential message to one ...
    • Distributed power control with received power constraints for time-area-spectrum licenses 

      Pérez Neira, Ana Isabel; Veciana Fontanet, Joaquim Maria; Vázquez, Miguel Ángel; Lagunas, Eva (2016-03)
      Article
      Open Access
      This paper deals with the problem of optimal decentralized power control in systems whose spectrum is regulated in time and space, the so-called time-area-spectrum (TAS) licensed. This license system gives to the owner the ...
    • Generalized multicast multibeam precoding for satellite communications 

      Joroughi, Vahid; Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel (2017-02-01)
      Article
      Open Access
      This paper deals with the problem of precoding in multibeam satellite systems. In contrast to general multiuser multiple-input-multiple-output cellular schemes, multibeam satellite architectures suffer from different ...
    • Joint temporal-spatial reference beamforming: EIG beamforming 

      Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel; Vázquez, Miguel Ángel (2010)
      Conference report
      Open Access
      Traditional methods for beamforming can be grouped in two families, the time reference beamformer and the spatial reference beamforming. Nevertheless, the increasing demand on receivers for location systems and high bandwidth ...
    • Linear precoding in multibeam satellite under licensed shared access 

      Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      Due to the scarcity of the spectrum, there is a current tendency to offer novel shared access licenses in order to increase the overall spectral efficiency. Under this context, license shared access (LSA) has appeared as ...
    • NOMA and interference limited satellite scenarios 

      Caus, Marius; Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Conference report
      Open Access
      This paper deals with the problem of non-orthogonal multiple access (NOMA) in multibeam satellite systems, where the signals are jointly precoded. It is considered that the number of frames that are simultaneously ...
    • On-board beam generation for multibeam satellite systems 

      Joroughi, Vahid; Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel; Devillers, Bertrand (2017-03-27)
      Article
      Open Access
      This paper aims at designing an onboard beam generation process for a hybrid onboard on-ground multibeam satellite architecture. The proposed method offers a good tradeoff between total throughput and feeder link bandwidth ...
    • Open spectrum communication systems and optimized downlink beamforming 

      Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (2012)
      Conference report
      Restricted access - publisher's policy
      This paper addresses the problem of transmit beamforming in open spectrum communication systems. In these scenarios, the operator or the data communication provider delivers a set of base stations to the final users ...
    • Performance analysis of joint precoding and MUD techniques in multibeam satellite systems 

      Vázquez, Miguel Ángel; Caus, Marius; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Conference report
      Open Access
      This paper considers interference mitigation techniques in the forward link of multibeam satellite systems. In contrast to previous works, either devoted to receiver interference mitigation (e.g. multiuser detection) or ...
    • Phase only transmit beamforming for spectrum sharing microwave systems 

      Vázquez, Miguel Ángel; Blanco, Luis; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Open Access
      This paper deals with the problem of phase-only transmit beamforming in spectrum sharing microwave systems. In contrast to sub-6 GHz schemes, general microwave systems require a large number of antennas due to its huge ...
    • Precoding in multibeam satellite communications: present and future challenges 

      Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel; Christopoulos, Dimitrios; Chatzinotas, Symeon; Ottersten, Bjorn; Arapoglou, Pantelis-Daniel; Ginesi, Alberto; Tarocco, Giorgio (2016-12-01)
      Article
      Open Access
      Whenever multibeam satellite systems target very aggressive frequency reuse in their coverage area, inter-beam interference becomes the major obstacle for increasing the overall system throughput. As a matter of fact, users ...
    • Regulation and research on wireless communications 

      Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel; Vázquez, Miguel Ángel (2011)
      Conference report
      Restricted access - publisher's policy
      This paper describes wh ich are the major changes would occur in regulation policies and role of the regulation bodies due to the advance of technology development, research and innovation in telecommunications. The ...
    • Robust multibeam satellite systems for underlay licensed shared access 

      Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Conference report
      Restricted access - publisher's policy
      This paper deals with the problem of multibeam satellite precoding design under spectrum sharing constraints. These regulation restrictions allow the coexistence with other wireless services such as terrestrial mm-wave ...
    • Space-time ML receiver and its reciprocal transmitter design for interference networks 

      Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (2011)
      Conference report
      Restricted access - publisher's policy
      This paper examines a type of linear beamforming for communications in interference networks. First, a receiver beamformer design is derived from a Maximum Likelihood (ML) framework with Automatic Gain Control (AGC) ...
    • The challenge of the multiantenna-IC and practical solutions for the MISO case 

      Pérez Neira, Ana Isabel; Vázquez, Miguel Ángel; Lagunas Hernandez, Miguel A. (2010)
      Lecture
      Open Access
      The interference channel (IC) models a network of simultaneous communication node pairs. Interference is not a fundamental limitation: IA (interference alignment) is cooperative and not selfish. It avoids MUD. What about ...
    • Transmit beamforming for the MISO Interference Channel with asymmetric link gains 

      Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (2012)
      Conference report
      Restricted access - publisher's policy
      This paper proposes a transmit beamforming technique to cope with the problem of the Multiple Input Single Out- put Interference Channel (MISO IC). In this scenario, the achievable sum-rate is highly conditioned by the ...