Real-time Online Learning for Pattern Reconfigurable Antenna State Selection

• Published in: 2020 7th NAFOSTED Conference on Information and Computer Science (NICS) pp. 13 - 18
• Main Authors: Rey, Xaime Rivas, Mainland, Geoffrey, Dandekar, Kapil
• Format: Conference Proceeding
• Language: English
• Published: IEEE 26.11.2020
• Subjects: Adaptive Pursuit; adaptive pursuit algorithm; antenna arrays; Antenna radiation patterns; antenna state selection algorithms; antenna state selection framework; directional beams; directional gain; directionality PRA; Directive antennas; experimental software defined radio testbed; greedy; Interference; interference sources; interference suppression; learning (artificial intelligence); Machine Learning; Multi-Armed Bandit; multiarmed bandit algorithm; Online Learning; pattern reconfigurable antenna state selection; pattern reconfigurable antennas; radiation pattern; radio links; radiofrequency interference; real-time online learning; Real-time systems; SISO communication; SISO wireless links; Software algorithms; Software Defined Radios; software radio; system performance; telecommunication computing; Wireless communication; wireless communication system; Wireless communications
• DOI: 10.1109/NICS51282.2020.9335872

Pattern reconfigurable antennas (PRAs) can dynamically change their radiation pattern and provide diversity and directional gain. These properties allow them to adapt to channel variations by steering directional beams toward desired transmissions and away from interference sources, thus enhancing the overall performance of a wireless communication system. To fully exploit the benefits of a PRA, the key challenge is being able to optimally select the antenna state in real time. Current literature on this topic, to the best of our knowledge, focuses on the design of algorithms to optimally select the best antenna mode with evaluation performed in simulation or postprocessing. In this study, we have not only designed a real-time online antenna state selection framework for SISO wireless links but we have also implemented it in an experimental software defined radio testbed. We benchmarked the multi-armed bandit algorithm against other antenna state selection algorithms and show how it can improve system performance by mitigating the effects of interference taking advantage of the directionality PRAs provide. We also show that when the optimal state changes over time the bandit approach does not work very well. For such a scenario, we show how the Adaptive Pursuit algorithm works well and can be a great solution. We also discuss what changes could be done to the bandit algorithm to work better in this case.