Electrical Balance Duplexer Field Trials in High-Speed Rail Scenarios

Laughlin, Leo; Zhang, Chunqing; Beach, M.A.; Morris, Kevin; Haine, John

doi:10.1109/tap.2017.2748224

Cited by 13 publications

(4 citation statements)

References 16 publications

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“…This multi-bit, multi-path architecture can provide 40-50 dB of isolation across 1.5-3.5 MHz bandwidth in a dynamic wireless environment [8], [9]. A real-world demonstration was reported to achieve a greater than 50 dB isolation across a 20 MHz bandwidth within a 5 ms tuning cycle [10]. Further, a digitally aided EBD provided 53 dB of Tx-Rx isolation and enhanced the performance across a larger bandwidth of 80 MHz in the ISM band [11].…”

Section: A Balanced Duplexer-based Sa-starmentioning

confidence: 99%

STAR Front-End Using Two Circulators in a Differential Connection

Zhao,

De Silva,

Venkatakrishnan

et al. 2024

IEEE J. Microw.

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In-band full duplex (IBFD) communication systems have attracted much interest due to their ability to double the spectrum efficiency by simultaneously transmitting and receiving (STAR) over the same bandwidth. Modern communication technologies have to adapt to be able to meet the ongoing high demand capacity over existing radio channels. This paper proposes a system-level approach based on physical symmetry to improve the electromagnetic performance of a 3-port circulator. A system-level design consisting of two matched circulators connected in a differential configuration is proposed to cancel out residual RF scattering and leakage that causes self-interference in a STAR front-end. The method is validated using a custom designed microwave circulator based on microstrip technology, which forms a building block that operates in the 3-8 GHz band with 20 dB isolation. The proposed RF front-end operates within an extended band of 3-8 GHz while simultaneously exhibiting improvement in isolation by about 10 dB (isolation 30 ± 4 dB) between the transmitter and the receiver ports of the STAR system.

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Section: A Balanced Duplexer-based Sa-starmentioning

confidence: 99%

STAR Front-End Using Two Circulators in a Differential Connection

Zhao,

De Silva,

Venkatakrishnan

et al. 2024

IEEE J. Microw.

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“…The interpolated time-frequency antenna reflection coefficient data were incorporated into a two stage SI cancellation simulation. The first stage is an EBD circuit simulation of the type previously described and validated against hardware measurements in [4], [7], and a detailed description can be found in [8,Section II.B]. This simulates a symmetrical lossless hybrid junction with a single pole resistor-capacitor (RC) balancing network, calculating the Tx-Rx amplitude frequency response, G EBD using the following equation:…”

Section: A Ebd Circuit Simulationmentioning

confidence: 99%

“…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%

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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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Antennas and Radio Frequency Self-Interference Cancellation

Laughlin¹,

Beach²

2020

Full-Duplex Communications for Future Wireless Networks

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Electrical Balance Duplexer Field Trials in High-Speed Rail Scenarios

Cited by 13 publications

References 16 publications

STAR Front-End Using Two Circulators in a Differential Connection

STAR Front-End Using Two Circulators in a Differential Connection

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

Antennas and Radio Frequency Self-Interference Cancellation

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