Adaptive Nonlinear RF Cancellation for Improved Isolation in Simultaneous Transmit-Receive Systems
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Author
Kiayani, Adnan
Waheed, Muhammad Zeeshan
Anttila, Lauri
Abdelaziz, Mahmoud
Korpi, Dani
Syrjala, Ville
Kosunen, Marko
Stadius, Kari
Ryynanen, Jussi
Valkama, Mikko
Date
2018
Major/Subject
Mcode
Degree programme
Language
en
Pages
14
Series
IEEE Transactions on Microwave Theory and Techniques
Abstract
This paper proposes an active radio frequency (RF) cancellation solution to suppress the transmitter (TX) passband leakage signal in radio transceivers supporting simultaneous transmission and reception. The proposed technique is based on creating an opposite-phase baseband equivalent replica of the TX leakage signal in the transceiver digital front-end through adaptive nonlinear filtering of the known transmit data, to facilitate highly accurate cancellation under a nonlinear power amplifier (PA). The active RF cancellation is then accomplished by employing an auxiliary TX chain to generate the actual RF cancellation signal, and combining it with the received signal at the receiver (RX) low-noise amplifier (LNA) input. A closed-loop parameter learning approach, based on the decorrelation learning rule, is also developed to efficiently estimate the coefficients of the nonlinear cancellation filter in the presence of a nonlinear PA with memory, finite passive isolation, and a nonlinear LNA. The performance of the proposed cancellation technique is evaluated through comprehensive RF measurements adopting commercial LTE-Advanced transceiver hardware components. The results show that the proposed technique can provide an additional suppression of up to 54 dB for the TX passband leakage signal at the LNA input, even at very high transmit power levels and with wide transmission bandwidths. Such a novel cancellation solution can, therefore, substantially improve the TX-RX isolation, hence reducing the requirements on passive isolation and RF component linearity, as well as increasing the efficiency and flexibility of the RF spectrum use in the emerging 5G radio networks.Description
Keywords
5G, adaptive cancellation, Baseband, carrier aggregation (CA), Couplings, duplexer isolation, flexible duplexing, frequency division duplexing, in-band full duplex (IBFD), least-mean squares (LMS), LTE-Advanced, Nonlinear distortion, nonlinear distortion, Passband, Radio frequency, radio frequency (RF) cancellation, Radio transceivers, self-interference (SI), transmitter (TX) leakage signal.
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Citation
Kiayani, A, Waheed, M Z, Anttila, L, Abdelaziz, M, Korpi, D, Syrjala, V, Kosunen, M, Stadius, K, Ryynanen, J & Valkama, M 2018, ' Adaptive Nonlinear RF Cancellation for Improved Isolation in Simultaneous Transmit-Receive Systems ', IEEE Transactions on Microwave Theory and Techniques, vol. 66, no. 5, pp. 2299-2312 . https://doi.org/10.1109/TMTT.2017.2786729
