Digital Nonlinear Self-Interference Cancellation Based on LMS-Volterra Algorithm

Novel Digital Cancelation Method in Presence of Harmonic Self-Interference

“…In addition, SIC in the analog domain, which is referred to as analog SIC (ASIC), cancels SI before the received signal is processed through analog-to-digital conversion (ADC) [9]- [11]. Finally, SIC in the digital domain, referred to as digital SIC (DSIC), eliminates the remaining SI after the ADC using digital signal processing [11]- [13]. Previously, IFD communication systems were mostly studied with the multiple antennas used in a multiple-input multiple-output (MIMO) setup to utilize PSIC, by separating the transmission and reception antennas.…”

“…In general, such HD operations for estimating the SI channels in the training field are necessary not only for DSIC, but also for ASIC [9]- [13]. This is because the SIC performance of a node can be degraded by its desired signal if two nodes communicate with the IFD in the training field.…”

“…SIC in the propagation domain, referred to as propagation SIC (PSIC), eliminates SI in the radio frequency (RF) wireless propagation channel. Finally, SIC in the digital domain, referred to as digital SIC (DSIC), eliminates the remaining SI after the ADC using digital signal processing [11]- [13]. Finally, SIC in the digital domain, referred to as digital SIC (DSIC), eliminates the remaining SI after the ADC using digital signal processing [11]- [13].…”

“…Finally, SIC in the digital domain, referred to as digital SIC (DSIC), eliminates the remaining SI after the ADC using digital signal processing [11]- [13]. Yet, it has recently been shown that IFD transceivers can be implemented using only a single antenna and that SI of up to 110 dB higher than the noise-floor power level can be eliminated in a single-antenna IFD transceiver [13]. When compared to HD MIMO systems with the same total number of antennas, however, IFD communications with separate transmission and reception antennas do not achieve an improvement in spectral efficiency in a spatially white MIMO channel; rather, they only improve the spectral efficiency when the MIMO channel is correlated [14].…”

“…Previously, IFD communication systems were mostly studied with the multiple antennas used in a multiple-input multiple-output (MIMO) setup to utilize PSIC, by separating the transmission and reception antennas. In addition, various negative effects of practical hardware limitations to IFD communications and SIC have been investigated, such as the harmonic components induced by the practical RF devices of the IFD transceiver [13], [15], a finite dynamic range of ADC [15], IQ imbalance [16], and SI channel estimation error [17]. Yet, it has recently been shown that IFD transceivers can be implemented using only a single antenna and that SI of up to 110 dB higher than the noise-floor power level can be eliminated in a single-antenna IFD transceiver [13].…”