Full-Duplex Systems Using Multireconfigurable Antennas

• NCJ Number: 249612
• Journal: IEEE Transactions on Wireless Communications Volume: 14 Issue: 11 Dated: November 2015 Pages: 5971-5983
• Author(s): E. Ahmed; A. M. Eltawil; Z. Y. Li; B. A. Cetiner
• Date Published: November 2015
• Length: 13 pages
• Grant Number(s): 2009-SQ-B9-K005
• Agencies: NIJ-Sponsored
• Publication Type: Test/Measurement; Research (Applied/Empirical); Report (Study/Research); Report (Grant Sponsored); Program/Project Description
• Award: NEMS Integrated Reconfigurable Antenna operating at 150, 400, 700, 800, and 4900 MHz bands for Interoperable Public Safety Communications

Annotation

Since full-duplex systems are expected to achieve a 100-percent rate improvement over half-duplex systems when the self-interference signal can be significantly mitigated, this article proposes the first full-duplex system that uses multi-reconfigurable antenna (MRA), with an approximately 90-percent rate improvement achieved compared with half-duplex systems.

Abstract

MRA is a dynamically reconfigurable antenna structure that is capable of changing its properties according to certain input configurations. A comprehensive experimental analysis was conducted to characterize the system performance in typical indoor environments. The experiments were performed using a fabricated MRA that has 4096 configurable radiation patterns. The achieved MRA-based passive self-interference suppression was investigated, with detailed analysis for the MRA training overhead. In addition, a heuristic-based approach is proposed to reduce the MRA training overhead. The results show that at 1-percent training overhead, a total of 95 dB self-interference cancellation is achieved in typical indoor environments. The 95-dB self-interference cancellation is experimentally shown to be sufficient for 90-percent full-duplex rate improvement compared with half-duplex systems. (Publisher abstract modified)