Real-time RF self-interference cancellation for in-band full duplex

Vermeulen, Tom; Liempd, Barend van; Hershbergt, Benjamin; Pollin, Sofie

doi:10.1109/dyspan.2015.7343915

Cited by 24 publications

(17 citation statements)

References 6 publications

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“…In this section we are interested in finding the properties of w ′ n . To measure the self-interference, the IBFD architecture from [26] is used, as shown in Fig. 4.…”

Section: Transmission Trials τ D Due To Decoding Errorsmentioning

confidence: 99%

Performance analysis of in-band collision detection for dense wireless networks

Vermeulen

Reynders

Rosas

et al. 2021

J Wireless Com Network

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With the massive growth of wireless networks comes a bigger impact of collisions and interference, which has a negative effect on throughput and energy efficiency. To deal with this problem, we propose an in-band wireless collision and interference detection scheme based on full-duplex technology. To study its performance, we compare its throughput and energy efficiency with the performance of traditional half-duplex and symmetric in-band full-duplex transmissions. Our analysis considers a realistic protocol and overhead modeling, and a measurement-based self-interference model. Our results indicate that our proposed collision detection scheme can provide significant gains in terms of throughput and energy efficiency in large wireless networks. Moreover, when compared to half-duplex and symmetric full-duplex, our analysis shows that this scheme allows up to 45% more nodes in the network for the same energy consumption per bit. These results suggest that this could be an enabling technology towards efficient, dense wireless networks.

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“…In this section we are interested in finding the properties of w ′ n . To measure the self-interference, the IBFD architecture from [26] is used, as shown in Fig. 4.…”

Section: Transmission Trials τ D Due To Decoding Errorsmentioning

confidence: 99%

Performance analysis of in-band collision detection for dense wireless networks

Vermeulen

Reynders

Rosas

et al. 2021

J Wireless Com Network

Self Cite

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“…Table I gives an overview of the cancellation performance of these SIC schemes. Because of real-world experience with the devices, we have found that these numbers are additive, meaning that combined they can achieve a −100 dB cancellation [10].…”

Section: B Proposed Architecturementioning

confidence: 99%

An energy-scalable in-band full duplex architecture

Vermeulen

Rosas

Liempd

et al. 2015

2015 IEEE 20th International Workshop on Computer Aided Modelling and Design of Communication Links and Networks (CAMAD)

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In-band full duplex (IBFD) is a promising technique that allows to potentially double the achievable bi-directional throughput over a given bandwidth. Moreover, it has been estimated that IBFD-equipped wireless networks can be more energy-efficient than half duplex ones due to the reduced energy cost of packet collisions. However, one key challenge for implementing an energy-efficient IBFD system is the cancellation of the interference produced by the transmitted signal. In fact, existing self-interference cancellation (SIC) techniques are not always energy-efficient, as the effect of the interference reduction might not be able to compensate the additional electronic power consumption introduced by the SIC module. Following this rationale, in this paper we propose and energyefficient IBFD architecture that adapts the SIC module to the link conditions. By studying a symmetric bi-directional full duplex link, we show that the proposed architecture obtains significant energy savings by using a simple SIC scheme for short-range transmissions. More powerful SIC techniques are shown to be an energy-optimal choice only when transmitting over long link distances.

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“…This is particularly relevant to handheld devices, where the close proximity of the user's hands can cause substantial changes in the local propagation environment, having a large impact on the self-interference channel. Electrical balance duplexers [2]- [6], which implement passive feedforward cancellation by electrically balancing the antenna impedance with a tunable balancing impedance, have been shown in previous works to be sensitive to fluctuations in the antenna impedance caused by reflections from the environment [4], [7]. The tunable impedance is therefore required to be adaptive, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1. Previous works [4], [7] have investigated the resulting fluctuations in Tx-Rx isolation in vehicular and user interaction scenarios, and results have shown that the dupelexer must be re-balanced at intervals of the order of 10s of milliseconds in these dynamic environments in order to maintain cancellation of the order of 50 dB (or implement antenna impedance tracking with an equivalent tracking loop bandwidth [6]). The impact of user interaction on Tx-Rx isolation was shown to be particularly significant [4].…”

Section: Introductionmentioning

confidence: 99%

In-band Full-duplex in Hand-held Applications: Analysis of Canceller Tuning Requirements

Laughlin

Zhang

Beach

et al. 2018

2018 Wireless Advanced (WiAd)

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This paper investigates the impact of user-antenna interaction on transmit-to-receive (Tx-Rx) isolation in a handheld In-band Full-duplex (IBFD) transceiver. Dynamic antenna measurements which capture the effect of user hand movements at 1900 MHz are incorporated into simulations of a two stage adaptive self-interference canceller, which simulates an electrical balance duplexer and a second stage of digital cancellation with different tracking adaptation rates. Results demonstrate that the dynamic self-interference channel which results from user movement places demanding requirements on the canceller coefficient tracking. Adaptation intervals of the order of tens of microseconds are required to maintain Tx-Rx isolation of the order of 90 dB, calling into question the feasibility of IBFD handheld devices.

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Real-time RF self-interference cancellation for in-band full duplex

Cited by 24 publications

References 6 publications

Performance analysis of in-band collision detection for dense wireless networks

Performance analysis of in-band collision detection for dense wireless networks

An energy-scalable in-band full duplex architecture

In-band Full-duplex in Hand-held Applications: Analysis of Canceller Tuning Requirements

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