Conference Paper

Equal gain MIMO beamforming in the RF domain for OFDM-WLAN systems

DOI: 10.1007/978-3-642-16644-0_13 Conference: Mobile Lightweight Wireless Systems - Second International ICST Conference, MOBILIGHT 2010, Barcelona, Spain, May 10-12, 2010, Revised Selected Papers
Source: DBLP


Equal gain beamforming (EGB) schemes are typically ap- plied 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 trans- missions, the design of the optimal phases is a complicated nonconvex problem with no closed-form solution. Building upon a previously pro- posed solution for at-fading MIMO channels, this paper describes an alternating minimization algorithm to nd an approximate (suboptimal) solution for the OFDM case. Monte-Carlo simulations are performed in order to demonstrate the eectiveness of this new analog beamforming scheme under coded and uncoded WLAN 802.11a transmissions.

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