A broadband and deep-TX self-interference cancellation technique for full-duplex and frequency-domain-duplex transceiver applications

Chu, Kun-Da; Katanbaf, Mohamad; Zhang, Tong; Su, Chenxin; Rudell, Jacques C.

doi:10.1109/isscc.2018.8310238

Cited by 45 publications

(14 citation statements)

References 5 publications

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“…Distortion introduced by Z rx should be considered as the residual SI power at RX input is still substantially larger (by 10s of dB) compared with the desired RX signal [4], [8]. Any distortion introduced by Z rx will add to the nonlinearities produced by the TX-SI passing through the SI mitigation circuits or the intermodulation products produced by the RX chain referenced back to the RX input ( Fig.…”

Section: B Radio Air Interface Sources Of Distortionmentioning

confidence: 99%

“…2), which will degrade the RX linearity. Because the TX common-mode leakage generates differential distortion at the RX input, simply designing an LNA and RX chain which is immune to common-mode signals [8], [14] is insufficient to improve the RX linearity. The model describing the differential nonlinear distortion arising from the common-mode TX leakage can be applied to any differential block which experiences a strong common-mode signal.…”

Section: Impact Of Tx Common-mode Leakagementioning

confidence: 99%

“…A tunable balancing impedance Z BAL realized using a resistive and capacitive bank controlled with integrated switches is necessary to track and match to a dynamic antenna impedance [6]. The RX chain contains an LNA [8], passive mixers, followed by a transimpedance amplifier (TIA) which then feeds the analog baseband, all modeled using transistor-level schematic simulations. The RF canceler is implemented as an adaptive FIR filter identical to the implementation given in [4], [8].…”

Section: A Circuit Simulation Modelmentioning

confidence: 99%

“…The RX chain contains an LNA [8], passive mixers, followed by a transimpedance amplifier (TIA) which then feeds the analog baseband, all modeled using transistor-level schematic simulations. The RF canceler is implemented as an adaptive FIR filter identical to the implementation given in [4], [8].…”

Section: A Circuit Simulation Modelmentioning

confidence: 99%

See 3 more Smart Citations

Effects of Receiver Input Impedance on Nonlinear Distortion in Full-Duplex Radios

Yin

Rudell

2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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This paper explores and models the generation of nonlinearities arising from common-and differential-mode transmitter (TX) self-interference (SI) at the input of full-duplex (FD) radio receivers (RX). The analysis reveals the impact of residual TX-SI which drives the RX input impedance(Zrx), generating distortion products that degrade the RX linearity. Circuit simulation results confirm a nonlinear Zrx introduces non-negligible distortion at the RX input from the residual TX-SI. To suppress the total distortion below the RX noise floor, SI mitigation circuits at RF front-end must provide at least 60dB SI suppression and 50dB common-mode isolation to achieve sufficient RX linearity performance. This paper draws conclusions with respect to strategies that allow a reduction in the nonlinearities generated at the RX input due to residual TX-SI as would be found in FD transceivers.

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Section: B Radio Air Interface Sources Of Distortionmentioning

confidence: 99%

Section: Impact Of Tx Common-mode Leakagementioning

confidence: 99%

Section: A Circuit Simulation Modelmentioning

confidence: 99%

Section: A Circuit Simulation Modelmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Receiver Input Impedance on Nonlinear Distortion in Full-Duplex Radios

Yin

Rudell

2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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“…We present a detailed overview of two types of SI cancellers using different approaches: (i) time-domain cancellers (in the RF and/or analog BB domains) employing parallel delay line (DL) taps, and (ii) frequency-domain cancellers (in the RF domain) employing parallel RF bandpass filter (BPF) taps. Although both types of cancellers have been realized and demonstrated in practical systems (e.g., [7], [41]- [43]), we focus on their recent implementations in ICs [15], [16], [28], [29], [38], [39], [44]- [70]. For quantitative and fair comparison similar to the integrated antenna interfaces, we define two FOM for integrated cancellers: (i) the canceller efficiency, and (ii) the SIC-FBW product.…”

Section: Introductionmentioning

confidence: 99%

A Survey and Quantitative Evaluation of Integrated Circuit-Based Antenna Interfaces and Self-Interference Cancellers for Full-Duplex

Chen

Garikapati

Nagulu

et al. 2021

IEEE Open J. Commun. Soc.

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Full-duplex (FD) wireless -simultaneous transmission and reception on the same frequency -is a promising technique that can significantly improve spectrum efficiency and reduce communication latency in future wireless networks. To enable FD operation, the powerful self-interference (SI) signal leaking from the transmitter (TX) into the receiver (RX) needs to be suppressed and canceled to an extreme degree at the antenna interface as well as in the RF/analog and digital domains. Various approaches to achieve TX-RX isolation at the antenna interface and SI cancellation (SIC) in the RF/analog and digital domains have been demonstrated, with a focus on using bench-top off-the-shelf components. Recent advances in integrated circuit (IC) implementations of various types of shared antenna interfaces and cancellers in the RF and/or analog baseband (BB) domains have further pushed the frontier of realizing FD wireless in small-form-factor/hand-held devices. Moreover, it is still important to fundamentally study the SIC performance that can be achieved by different types of cancellers. In this paper, we present a first-of-its-kind comprehensive overview on the implementation and comparison of various state-of-theart integrated shared antenna interfaces and SI cancellers in both the RF and analog BB domains. We define two figures of merit (FOM) for the IC-based shared antenna interfaces and SI cancellers, which capture various design considerations and performance tradeoffs including the achievable isolation/SIC, bandwidth, noise figure degradation, TX/SI power handling, and power consumption. In particular, we focus on two types of integrated shared antenna interfaces including electrical-balance duplexers and circulators. We also discuss two types of SI cancellers based on the time-domain and frequency-domain approaches, which respectively employ parallel delay lines and bandpass filters to emulate the SI channel. Based on realistic measurements, we perform extensive numerical evaluations to illustrate and compare the achievable RF SIC performance in different scenarios, as well as discuss various design tradeoffs. Finally, we provide an overview of the IC-based implementations and performance evaluations of both types of cancellers based on our recent work. INDEX TERMS Full-duplex wireless, integrated circuit (IC), antenna interface, self-interference cancellation, systems and testbeds. TINGJUN CHEN (Member, IEEE) received the B.Eng. degree in electronic engineering from Tsinghua University in 2014, and the Ph.D. degree in electrical engineering from Columbia University in 2020. He is an Assistant Professor with the Department of Electrical and Computer Engineering, Duke University and was a Postdoctoral Associate with Yale University from 2020 to 2021. His research interests are in the area of networking and communications with a specific focus on next-generation wireless networks and Internet-of-Things systems.

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Integrated Full-Duplex Radios: System Concepts, Implementations, and Experimentation

Chen

Zhou

Zussman

et al. 2020

Full-Duplex Communications for Future Wireless Networks

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A broadband and deep-TX self-interference cancellation technique for full-duplex and frequency-domain-duplex transceiver applications

Cited by 45 publications

References 5 publications

Effects of Receiver Input Impedance on Nonlinear Distortion in Full-Duplex Radios

Effects of Receiver Input Impedance on Nonlinear Distortion in Full-Duplex Radios

A Survey and Quantitative Evaluation of Integrated Circuit-Based Antenna Interfaces and Self-Interference Cancellers for Full-Duplex

Integrated Full-Duplex Radios: System Concepts, Implementations, and Experimentation

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