TY - GEN
T1 - Predistortion for power amplifier linearization in full-duplex transceivers without extra RF chain
AU - Gregorio, Fernando H.
AU - Gonzalez, Gustavo J.
AU - Cousseau, Juan
AU - Riihonen, Taneli
AU - Wichman, Risto
PY - 2017/6/16
Y1 - 2017/6/16
N2 - Genuine full-duplex operation requires effective mitigation of self-interference (SI) due to simultaneous transmission and reception at the same frequency band. In addition to its well-known harmful effect on signals of high peak-to-average power ratio, nonlinear behavior of a power amplifier (PA) complicates SI cancellation and induces spectral regrowth. We introduce a digital predistortion architecture that linearizes the response of the PA in a full-duplex transceiver. Specifically, we propose a two-step procedure to estimate the predistorter parameters and the SI canceller coefficients. Different from a direct application of conventional predistorters, the proposed architecture does not need an extra RF chain to estimate the PA response and exploits the inherent SI signal instead. Finally, simulation results show that the proposed scheme is able to increase significantly the signal-to-interference-plus-noise ratio at the transceiver output and to reduce out-of-band emissions when compared to linear and nonlinear cancellation without predistortion.
AB - Genuine full-duplex operation requires effective mitigation of self-interference (SI) due to simultaneous transmission and reception at the same frequency band. In addition to its well-known harmful effect on signals of high peak-to-average power ratio, nonlinear behavior of a power amplifier (PA) complicates SI cancellation and induces spectral regrowth. We introduce a digital predistortion architecture that linearizes the response of the PA in a full-duplex transceiver. Specifically, we propose a two-step procedure to estimate the predistorter parameters and the SI canceller coefficients. Different from a direct application of conventional predistorters, the proposed architecture does not need an extra RF chain to estimate the PA response and exploits the inherent SI signal instead. Finally, simulation results show that the proposed scheme is able to increase significantly the signal-to-interference-plus-noise ratio at the transceiver output and to reduce out-of-band emissions when compared to linear and nonlinear cancellation without predistortion.
KW - digital predistortion
KW - Full duplex
KW - nonlinear distortion
KW - self-interference
KW - spectral regrowth
UR - http://www.scopus.com/inward/record.url?scp=85023776588&partnerID=8YFLogxK
U2 - 10.1109/ICASSP.2017.7953421
DO - 10.1109/ICASSP.2017.7953421
M3 - Conference contribution
AN - SCOPUS:85023776588
T3 - Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing
SP - 6563
EP - 6567
BT - 2017 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2017 - Proceedings
PB - IEEE
T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing
Y2 - 5 March 2017 through 9 March 2017
ER -