EqualPhase Beamforming Architecture for RFMIMO A

Authors: Fouad Gholam Javier Vía Alfredo Nazábal Ignacio Santamaría

Publish Date: 2010/5/10

Volume: , Issue: , Pages: 171-179

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Abstract

This paper considers a novel multipleinput multipleoutput MIMO architecture which combines the signals in the radiofrequency 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 phaseshifter 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 equalphase combining EPC beamformers Interestingly this problem can be exactly solved in the case of rankone 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

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