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International Journal of Antennas and Propagation
Volume 2017 (2017), Article ID 4194921, 15 pages
https://doi.org/10.1155/2017/4194921
Research Article

MIMO Fading Emulator Development with FPGA and Its Application to Performance Evaluation of Mobile Radio Systems

Advanced Wireless and Communication Research Center (AWCC), The University of Electro-Communications (UEC), 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan

Correspondence should be addressed to Yoshio Karasawa

Received 18 January 2017; Revised 23 May 2017; Accepted 6 June 2017; Published 13 July 2017

Academic Editor: Miguel Ferrando Bataller

Copyright © 2017 Yoshio Karasawa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We present four new developments for a multiple-input multiple-output (MIMO) over-the-air measurement system based on our previous studies. The first two developments relate to the channel model for multipath environment generation. One is a further simplification of the circuit configuration without performance degradation by reducing the number of delay generation units, which dominate the performance limit when implementing the circuit on a field-programmable gate array (FPGA). The other is to realize spatial correlation characteristics among the input ports on the transmission side, whereas the previously proposed channel model did not consider this correlation. The third development involves the details of implementing the MIMO fading emulator on an FPGA as a two-stage scheme. The fourth is the demonstration of application examples of the developed system.