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In recent years, several experimental studies have come out to validate thetheoretical findings of interference alignment (IA), but only a handful ofstudies have focused on blind interference alignment. Unlike IA and otherinterference mitigation techniques, blind IA does not require channel stateinformation at the transmitter (CSIT). The key insight is that the transmitteruses the knowledge of channel coherence intervals and receivers utilizereconfigurable antennas to create channel fluctuations exploited by thetransmitter. In this work, we present a novel experimental evaluation of areconfigurable antenna system for achieving blind IA. We present a blind IAtechnique based on reconfigurable antennas for a 2-user multipleinputsingle-output (MISO) broadcast channel implemented on a software defined radioplatform where each of the receivers is equipped with a reconfigurable antenna.We further compare this blind IA implementation with traditional TDMA schemefor benchmarking purposes. We show that the achievable rates for blind IA canbe realized in practice using measured channels under practical channelconditions. Additionally, the average error vector magnitude and bit error rate(BER) performances are evaluated.

Experimental Evaluation of a Reconfigurable Antenna System for Blind Interference Alignment