Self-interference cancellation for full-duplex transceivers
Tapio, Visa (2023-12-01)
https://urn.fi/URN:ISBN:9789526239194
Kuvaus
Tiivistelmä
Abstract
In in-band full-duplex (FD) systems, the self-interference (SI) power can be more than 100 dB higher than the power of the received data signal. In order to enable FD transmissions, several SI cancellation stages are required in an FD transceiver. By combining the cancellation at the radio frequency (RF) with a specially designed antenna and cancellation circuitry, and SI cancellation at the digital baseband, the required level of SI cancellation can be achieved. In this thesis, an FD transceiver architecture is modelled with simulation tools that allow one to use realistic antenna and analog transceiver models and at the same time enable algorithm studies. The analog SI cancellation at the RF is controlled by the baseband digital processing unit, and the tuning of the RF canceller is performed with an automatic gain control enhanced iterative algorithm. When a power amplifier is the only non-linear component at the SI channel, the digital baseband SI cancellation is based on the Hammerstein model in order to take the power amplifier non-linearity into account. When realistic values for the phase noise and imbalance between the in-phase and quadrature branches of the transceiver (IQ imbalance) are taken into account, the SI after all the cancellation stages can decrease the signal-to-interference-and-noise-ratio. In order to further enhance the SI cancellation, the Hammerstein based SI canceller is extended to cancel also the effect of the receiver IQ imbalance. With the extended baseband canceller, the cancellation performance is mainly limited by the phase noise. When the non-linear operation of a low noise amplifier at the receiver is also considered, the SI channel is modelled with the Hammerstein-Wiener model. In this case, the best SI cancellation performance at the digital baseband processing is achieved with a neural network type SI canceller.
Tiivistelmä
Full duplex (FD) järjestelmissä itseishäiriön teho voi olla yli 100 dB voimakkaampi kuin vastaanotetun hyötysignaalin teho. FD-lähetysten käyttö edellyttää itseishäiriön vaimentamista FD-lähetinvastaanottimessa useilla eri menetelmillä. Yhdistämällä antennisuunnittelu ja aktiivinen häiriönvaimennus radiotaajuudella sekä digitaalinen häiriönpoisto lähetinvastaanottimen kantataajuusosissa, vaadittava häiriönvaimennus voidaan saavuttaa. Väitöskirjassa FD-lähetinvastaanotin on mallinnettu sellaisilla simulaatiotyökaluilla, jotka mahdollistavat antennien ja analogisten osien tarkan mallintamisen ja samalla mahdollistavat algoritmitutkimuksen samassa ympäristössä. Analogista radiotaajuista häiriönvaimennusta kontrolloidaan kantatajuisella, digitaalisella prosessoinnilla. Analogisen häiriönvaimennuksen ohjauksessa käytetään digitaalista, iteratiivista algoritmia hyödyntäen samalla automaattista vahvistuksen säätöä vastaanottimen analogiaosissa. Kun lähetinvastaanottimen ainoa epälineaarinen osa on tehovahvistin, digitaalinen häiriönvaimennus perustuu Hammerstein-malliin. Kun realistiset vaihekohina- ja lähetinvastaanottimen kvadratuurikanavien epätasapainoarvot (IQ-epätasapaino) huomioidaan mallissa, häiriönpoiston suorituskyky heikkenee. Laajentamalla Hammersteinin mallia, IQ-epätasapainon vaikutus voidaan kuitenkin kompensoida. Tällöin suorituskykyä rajoittavaksi tekijäksi jää vaihekohina. Kun myös vastaanottimen vahvistimen epälineaarisuus huomioidaan, itseishäiriökanava mallinnetaan Hammerstein-Wiener-mallilla. Tässä tapauksessa paras häiriönpoiston suorituskyky saavutetaan käyttämällä neuroverkkotyyppistä häiriönvaimennusta.
Original papers
Original papers are not included in the electronic version of the dissertation.
Tapio, V., Alves, H., & Juntti, M. (2017). Joint analog and digital self-interference cancellation and full-duplex system performance. 2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 6553–6557. https://doi.org/10.1109/ICASSP.2017.7953419
Tapio, V., Sonkki, M., & Juntti, M. (2018). Performance of a full-duplex system in non-linear and time-varying self-interference channel. 2018 IEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), 1–5. https://doi.org/10.1109/PIMRC.2018.8580927
Tapio, V., Sonkki, M., & Juntti, M. (2018). Analog self-interference cancellation with automatic gain control for full-duplex transceivers. 2018 IEEE 87th Vehicular Technology Conference (VTC Spring), 1–5. https://doi.org/10.1109/VTCSpring.2018.8417518
Tapio, V., Juntti, M., Pärssinen, A., & Rikkinen, K. (2016). Real time adaptive RF and digital self-interference cancellation for full-duplex transceivers. 2016 50th Asilomar Conference on Signals, Systems and Computers, 1558–1562. https://doi.org/10.1109/ACSSC.2016.7869640
Tapio, V., Sonkki, M., & Juntti, M. (2020). Self-interference cancelation in the presence of non-linear power amplifier and receiver IQ imbalance. EURASIP Journal on Wireless Communications and Networking, 2020(1), 127. https://doi.org/10.1186/s13638-020-01743-z
Tapio, V., & Juntti, M. (2021). Non-linear self-interference cancelation for full-duplex transceivers based on Hammerstein-Wiener model. IEEE Communications Letters, 25(11), 3684–3688. https://doi.org/10.1109/LCOMM.2021.3109669
Osajulkaisut
Osajulkaisut eivät sisälly väitöskirjan elektroniseen versioon.
Tapio, V., Alves, H., & Juntti, M. (2017). Joint analog and digital self-interference cancellation and full-duplex system performance. 2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 6553–6557. https://doi.org/10.1109/ICASSP.2017.7953419
Tapio, V., Sonkki, M., & Juntti, M. (2018). Performance of a full-duplex system in non-linear and time-varying self-interference channel. 2018 IEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), 1–5. https://doi.org/10.1109/PIMRC.2018.8580927
Tapio, V., Sonkki, M., & Juntti, M. (2018). Analog self-interference cancellation with automatic gain control for full-duplex transceivers. 2018 IEEE 87th Vehicular Technology Conference (VTC Spring), 1–5. https://doi.org/10.1109/VTCSpring.2018.8417518
Tapio, V., Juntti, M., Pärssinen, A., & Rikkinen, K. (2016). Real time adaptive RF and digital self-interference cancellation for full-duplex transceivers. 2016 50th Asilomar Conference on Signals, Systems and Computers, 1558–1562. https://doi.org/10.1109/ACSSC.2016.7869640
Tapio, V., Sonkki, M., & Juntti, M. (2020). Self-interference cancelation in the presence of non-linear power amplifier and receiver IQ imbalance. EURASIP Journal on Wireless Communications and Networking, 2020(1), 127. https://doi.org/10.1186/s13638-020-01743-z
Tapio, V., & Juntti, M. (2021). Non-linear self-interference cancelation for full-duplex transceivers based on Hammerstein-Wiener model. IEEE Communications Letters, 25(11), 3684–3688. https://doi.org/10.1109/LCOMM.2021.3109669
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