This paper investigates the impact of user-antenna interaction on transmit-to-receive (Tx-Rx) isolation in a handheld In-band Full-duplex (IBFD) transceiver. Dynamic antenna measurements which capture the effect of user hand movements at 1900 MHz are incorporated into simulations of a two stage adaptive self-interference canceller, which simulates an electrical balance duplexer and a second stage of digital cancellation with different tracking adaptation rates. Results demonstrate that the dynamic self-interference channel which results from user movement places demanding requirements on the canceller coefficient tracking. Adaptation intervals of the order of tens ofmicroseconds are required to maintain Tx-Rx isolation of the order of 90 dB, calling into question the feasibility of IBFD handheld devices.
|Title of host publication||2018 IEEE Wireless Advanced (WIAD 2018)|
|Subtitle of host publication||Proceedings of a meeting held 26-28 June 2018, London, United Kingdom|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Number of pages||5|
|Publication status||Published - Feb 2019|
Laughlin, L., Zhang, C. J., Beach, M., & Morris, K. (2019). In-band full-duplex in hand-held applications: analysis of canceller tuning requirements. In 2018 IEEE Wireless Advanced (WIAD 2018): Proceedings of a meeting held 26-28 June 2018, London, United Kingdom (pp. 41-45).  Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/WIAD.2018.8588446