Design and simulation of a flexible beamforming interface for MIMO receivers using a Butler labyrinth
This article focuses on the design and simulation of a new component for analog beamforming based on the Butler labyrinth. The proposed component enables the analysis of four-antenna beamforming in systems with two receive channels. The problem was to design a component that would enable simulation of a MIMO receiver with an accurate account of the analog beam-former effects on the digital signal processing level. The entire process is describedfrom layout design to the final DSP level integration and simulation. The performance of the simulated Butler component is compared to that of an ideal, theoretical one. The differences in the results indicate the importance of taking into account the effects of the layout level design on the DSP simulation level. The new component proves valuable for the bottom-up approach in the design and simulation of a wireless system.  2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2011.
design and simulation mimo receiver butler labyrinth analog beamforming bottom-up integration