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

Research Article

Equal Gain MIMO Beamforming in the RF Domain for OFDM-WLAN Systems

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  • @INPROCEEDINGS{10.1007/978-3-642-16644-0_13,
        author={\^{A}lvaro Gonzalo and Ignacio Santamar\^{\i}a and Javier V\^{\i}a and Fouad Gholam and Ralf Eickhoff},
        title={Equal Gain MIMO Beamforming in the RF Domain for OFDM-WLAN 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={Analog Combining Multiple-Input Multiple-Output (MIMO) Equal-Gain MIMO Beamforming Orthogonal Frequency Division Multiplexing (OFDM) Wireless Local Area Networks (WLAN)},
        doi={10.1007/978-3-642-16644-0_13}
    }
    
  • Álvaro Gonzalo
    Ignacio Santamaría
    Javier Vía
    Fouad Gholam
    Ralf Eickhoff
    Year: 2012
    Equal Gain MIMO Beamforming in the RF Domain for OFDM-WLAN Systems
    MOBILIGHT
    Springer
    DOI: 10.1007/978-3-642-16644-0_13
Álvaro Gonzalo1, Ignacio Santamaría1, Javier Vía1, Fouad Gholam1, Ralf Eickhoff2
  • 1: University of Cantabria
  • 2: Dresden University of Technology

Abstract

Equal gain beamforming (EGB) schemes are typically applied in the baseband domain and hence require complex RF transceivers. In order to simplify the circuitry and energy consumption of the MIMO transceiver, in this paper we consider an EGB scheme that operates in the RF domain by means of analog phase shifters. Under OFDM transmissions, the design of the optimal phases is a complicated nonconvex problem with no closed-form solution. Building upon a previously proposed solution for flat-fading MIMO channels, this paper describes an alternating minimization algorithm to find an approximate (suboptimal) solution for the OFDM case. Monte-Carlo simulations are performed in order to demonstrate the effectiveness of this new analog beamforming scheme under coded and uncoded WLAN 802.11a transmissions.