Recent Advances in Antenna Design and Interference Cancellation Algorithms for In-Band Full Duplex Relays

被引:218
作者
Heino, Mikko [1 ]
Korpi, Dani [5 ]
Huusari, Timo [5 ]
Antonio-Rodriguez, Emilio [1 ]
Venkatasubramanian, Sathya [2 ]
Riihonen, Taneli [3 ]
Anttila, Lauri [5 ]
Icheln, Clemens [2 ]
Haneda, Katsuyuki [4 ]
Wichman, Risto [3 ]
Valkama, Mikko [5 ]
机构
[1] Aalto Univ, Espoo, Finland
[2] Aalto Univ, Dept Radio Sci & Engn, Sch Elect Engn, Espoo, Finland
[3] Aalto Univ, Dept Signal Proc & Acoust, Sch Elect Engn, Espoo, Finland
[4] Aalto Univ, Sch Elect Engn, Espoo, Finland
[5] Tampere Univ Technol, Dept Elect & Commun Engn, FIN-33101 Tampere, Finland
基金
芬兰科学院;
关键词
Spectrum efficiency - Antennas;
D O I
10.1109/MCOM.2015.7105647
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In-band full-duplex relays transmit and receive simultaneously at the same center frequency, hence offering enhanced spectral efficiency for relay deployment. In order to deploy such full-duplex relays, it is necessary to efficiently mitigate the inherent self-interference stemming from the strong transmit signal coupling to the sensitive receive chain. In this article, we present novel state-of-the-art antenna solutions as well as digital self-interference cancellation algorithms for compact MIMO fullduplex relays, specifically targeted for reduced-cost deployments in local area networks. The presented antenna design builds on resonant wavetraps and is shown to provide passive isolations on the order of 60-70 dB. We also discuss and present advanced digital cancellation solutions, beyond classical linear processing, specifically tailored against nonlinear distortion of the power amplifier when operating close to saturation. Measured results from a complete demonstrator system, integrating antennas, RF cancellation, and nonlinear digital cancellation, are also presented, evidencing close to 100 dB of overall self-interference suppression. The reported results indicate that building and deploying compact full-duplex MIMO relays is already technologically feasible.
引用
收藏
页码:91 / 101
页数:11
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