TUTCRIS - Tampereen teknillinen yliopisto


Compact inband full-duplex relays with beyond 100 dB self-interference suppression: Enabling techniques and field measurements



JulkaisuIEEE Transactions on Antennas and Propagation
Varhainen verkossa julkaisun päivämäärämarraskuuta 2016
DOI - pysyväislinkit
TilaJulkaistu - helmikuuta 2017
OKM-julkaisutyyppiA1 Alkuperäisartikkeli


In this paper, the self-interference channel and novel enabling techniques for a compact inband full-duplex relay are described and characterized in different operating environments. The full-duplex operation is based on a novel antenna design that uses wavetraps to provide passive isolation of up to 70 dB between the transmit and receive antenna ports. The passive isolation is complemented with novel active RF and digital cancellation stages that further suppress the residual SI to the receiver noise floor. Measurement results of a complete prototype implementation show that the proposed design can achieve an overall SI cancellation performance of over 100 dB even with an ambitious instantaneous bandwidth of 80 MHz. Similar results are obtained both in an anechoic chamber as well as in realistic multipath indoor environments.