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Full-Duplex Systems Using Multireconfigurable Antennas

NCJ Number
IEEE Transactions on Wireless Communications Volume: 14 Issue: 11 Dated: November 2015 Pages: 5971-5983
E. Ahmed; A. M. Eltawil; Z. Y. Li; B. A. Cetiner
Date Published
November 2015
13 pages
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.
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)