Heterogeneous In-Band Full-Duplex for Simultaneous SUN-OFDM Transmission and SUN-FSK Reception

This study proposes a heterogeneous in-band full-duplex (Het-IBFD) system for the simultaneous transmission of the Wi-SUN field area network (Wi-SUN FAN) 1.1 signal using IEEE 802.15.4-2020-compliant orthogonal frequency division multiplexing (OFDM) and reception of the Wi-SUN FAN 1.0 signal using IEEE 802.15.4g-compliant frequency-shift keying (FSK). Furthermore, we propose a simple and highly accurate digital self-interference (SI) canceller to realize the proposed system, focusing on the difference between the spectrum of the IEEE 802.15.4g FSK and IEEE 802.15.4-2020 OFDM. The proposed Het-IBFD system using the proposed digital SI canceler is evaluated using computer simulations under the conditions of one-path Rayleigh fading for the desired communication channel and Rice fading for the SI channel. If no quantization noise effect is considered and the Rice factor is 5 dB, the communication quality of the FSK in Het-IBFD can achieve the required packet error rate (PER) of the wireless smart ubiquitous network (Wi-SUN) system. This is realized using the proposed digital SI canceller when the sum of the pathloss and antenna/analog SI cancelation level is more than 39 dB. If the quantization noise effect is considered with the 12-bit acrlong ADC and the Rice factor is 20 dB, the communication quality of the FSK in Het-IBFD can achieve the required PER of the Wi-SUN system using the proposed digital SI canceller when the sum of the pathloss and antenna/analog SI cancelation level is more than 52 dB.