Mobile Lightweight Wireless Systems. Second International ICST Conference, MOBILIGHT 2010, Barcelona, Spain, May 10-12, 2010, Revised Selected Papers

Research Article

Equal-Phase Beamforming Architecture for RF-MIMO Antenna Systems

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  • @INPROCEEDINGS{10.1007/978-3-642-16644-0_16,
        author={Fouad Gholam and Javier V\^{\i}a and Alfredo Naz\^{a}bal and Ignacio Santamar\^{\i}a},
        title={Equal-Phase Beamforming Architecture for RF-MIMO Antenna Systems},
        proceedings={Mobile Lightweight Wireless Systems. Second International ICST Conference, MOBILIGHT 2010, Barcelona, Spain, May 10-12, 2010, Revised Selected Papers},
        proceedings_a={MOBILIGHT},
        year={2012},
        month={10},
        keywords={RF-MIMO beamformer equal-phase MIMO beamforming semidefinite relaxation (SDR)},
        doi={10.1007/978-3-642-16644-0_16}
    }
    
  • Fouad Gholam
    Javier Vía
    Alfredo Nazábal
    Ignacio Santamaría
    Year: 2012
    Equal-Phase Beamforming Architecture for RF-MIMO Antenna Systems
    MOBILIGHT
    Springer
    DOI: 10.1007/978-3-642-16644-0_16
Fouad Gholam1,*, Javier Vía1,*, Alfredo Nazábal1,*, Ignacio Santamaría1,*
  • 1: University of Cantabria
*Contact email: fouad@gtas.dicom.unican.es, jvia@gtas.dicom.unican.es, alfredo@gtas.dicom.unican.es, nacho@gtas.dicom.unican.es

Abstract

This paper considers a novel multiple-input multiple-output (MIMO) architecture, which combines the signals in the radio-frequency (RF) domain. Unlike previous approaches, the proposed architecture is exclusively based on the application of different gain factors to the transmitted/received signals, and therefore it avoids the need of including a controllable phase-shifter (or sign switch) for each transmit/receive antenna. From a baseband point of view, the transceiver design consists in obtaining the optimal equal phase transmit (EPT) and equal-phase combining (EPC) beamformers. Interestingly, this problem can be exactly solved in the case of rank-one channels, which can be exploited to construct an iterative algorithm for the general MIMO case. The proposed architecture is evaluated by means of Monte Carlo simulations, which show that the slight performance degradation with respect to previous approaches is justified by the significant reduction in the hardware cost and power consumption.