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http://dx.doi.org/10.6109/jkiice.2016.20.3.484

Implementation of Self-Interference Cancellation Techniques for Full-Duplex Communication  

Kim, Young-Jun (Department of Electrical and Information Engineering, Seoul National University of Science and Technology)
Shin, Jinjae (Department of Electrical and Information Engineering, Seoul National University of Science and Technology)
Cho, Hyundeok (Department of Electrical and Information Engineering, Seoul National University of Science and Technology)
Yun, Ji-Hoon (Department of Electrical and Information Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.20, no.3, 2016 , pp. 484-490 More about this Journal
Abstract
Full-duplex communication can enhance wireless capacity by enabling simultaneous transmission and reception of the signals on the same frequency spectrum. Such a benefit, however, is only achieved when strong self-interference is well canceled below a sufficient level. To achieve this goal, there have been several approaches for cancellation, each of which is combined with digital-domain cancellation for a higher gain. In this paper, we implement two self-interference cancellation techniques and integrate them with a software defined radio-based wireless communication testbed. Two cancellation techniques (antenna cancellation and noise subtraction) are implemented and the cancellation gain is measured via real experiments. The results show that the gain of the antenna placement technique highly depends on the placement of a receiving antenna and the highest gain is achieved at the expected point, and we show that combining the noise subtraction circuit with the antenna placement further improves the cancellation gain.
Keywords
full-duplex communication; self-interference; interference cancellation; antenna placement technique;
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