A Self-Interference Suppression Structure for Collinear Dipoles

Xun, Jian‐Hui; Shi, Ling‐Feng; Liu, Weirong; Xin, Dong-Jin

doi:10.1109/lawp.2019.2938003

Cited by 16 publications

(5 citation statements)

References 18 publications

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“…Consequently, using a larger AACs with C ant C ana ≤ −50 dB decreased the effects from the noises and resulted the similar BER performances as that of no SI effect. In fact, numerous authors have reported that they achieved more than 45 dB SI suppression capability using antenna cancellation (i.e., C ant < −45 dB) [5,13] and more than 30 dB suppression capability using analog cancellation (i.e., C ana < −30 dB) [6,11]. Considering feasibility, in our further simulations, we refer to the results of previous works and conservatively set C ant = −45 dB and C ana = −15 dB to suppress the effects of these noises.…”

Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Currently, various approaches have been proposed in the existing works to suppress SI and enhance SE, such as antenna, analog, and digital cancellation [4][5][6][7][8][9][10][11]. Generally, antenna cancellation is aimed at increasing the isolation between transmission and reception [5]. Analog cancellation is used to suppress the SI power by combining a reference SI signal in which the phase and amplitude are adjusted [6,7,11].…”

Section: Introductionmentioning

confidence: 99%

“…In our proposal, desired signals are directly demodulated in the presence of SI and thermal noise. We further provide system-level performance such as BER to evaluate the proposed approach in the IBFD systems, contrary to existing works [4][5][6][7][8][9][10][12][13][14][15][16] where most studies only focused on the SI suppression capability.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Lazy Learning-Based Self-Interference Cancellation Approach for In-Band Full-Duplex Wireless Communication Systems

Zhao

Liao

et al. 2022

Wireless Communications and Mobile Computing

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We propose a new lazy learning-based cancellation approach to improve spectral efficiency for current wireless communication systems, suppress self-interference (SI) sent from base stations, and enable in-band full-duplex (IBFD) transmissions in cellular networks. Our proposed approach consists of two phases based on traditional IBFD systems: an offline phase for database generation and an online phase for data transmission. In the offline phase, the output before a 0/1 decision is premeasured without the desired signal input and recorded in a database with self-defined feature vectors (FVs). In the online phase, a suitable result is sought from the generated database with the help of a learning method and FV for the same system architecture with the desired signal input. The result is then assigned an SI cancellation value. Regular and eager learning-based cancellation approaches are employed to evaluate the proposed method and simulate the transmission output. Computer simulation results indicated that the proposed cancellation methods could achieve about 134 dB SI suppression and achieve nearly the same transmission levels as methods with no SI effect, enabling the IBFD operations in wireless communication systems better than the regular and eager learning-based techniques.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Lazy Learning-Based Self-Interference Cancellation Approach for In-Band Full-Duplex Wireless Communication Systems

Zhao

Liao

et al. 2022

Wireless Communications and Mobile Computing

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show abstract

“…In-band full-duplex (IBFD) or simultaneous transmit and receive (STAR) wireless systems has the potential of doubling the spectrum efficiency without increasing frequency bandwidth. To enhance the isolation, self-interference cancellation methods [1][2][3][4] and polarization diversity methods [5][6][7][8] have been intensively investigated in antenna designs. High isolation can also be obtained by utilizing the 180 hybrid couplers or circulators in the feeding networks.…”

Section: Introductionmentioning

confidence: 99%

Compact in‐band pattern diversity antenna for wireless applications

Mao

et al. 2021

Micro & Optical Tech Letters

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A compact pattern diversity patch antenna working at 5.8 GHz is proposed. The patch antenna has two ports, which are responsible for the broadside radiation and omni‐directional radiation, respectively. The broadside radiation is achieved by inserting a substrate slot‐loaded integrated waveguide (SIW) cavity at the center of the patch antenna, and the omni‐directional pattern is realized by exciting the shorted patch in‐phase from both sides of the SIW cavity. Although the two operating modes share the same radiator, but a high isolation of over 30 dB is achieved, due to the cancellation of current at the inputs. In addition, two approaches are investigated to enhance the operation bandwidths. The pattern diversity antenna is prototyped and measured, showing an impedance bandwidth of 5.69–5.92 GHz for both modes/channels, and a high inter‐channel isolation over 30 dB, making it suitable for indoor wireless communication systems.

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Decoupled Dipole Arrays Empowered by Invisible Complex Poles in Epsilon‐Near‐Zero Metamaterials

Zhu,

Liao,

Tang

et al. 2024

Adv Funct Materials

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Evanescent waves, characterized by an exponential decay in propagation, have witnessed significant advancements in far‐field imaging and near‐field sensing applications. However, incoming evanescent waves can excite guided resonance inside a dielectric slab, resulting in a rapid growth of transmission coefficient toward infinity at the pole points. Such evanescent‐wave excited resonance benefits super‐resolution applications yet causes severe crosstalk in highly integrated multi‐channel devices. Here, the invisible complex poles are discovered in the transmission spectra of epsilon‐near‐zero (ENZ) metamaterials and demonstrate the striking suppression of near‐field crosstalk enabled by the anomalous transmission beyond the critical angle. Equipped with an ENZ metamaterial spacer, collinear dipole arrays exhibit 9.2 dB improvement in near‐field isolation among interior dipoles at a distance of less than one wavelength. Experimental measurements show negligible influence on the intrinsic impedance matching and radiation patterns of the dipole antennas. The discovered field divergence effect from the disappearance of real‐valued pole singularity in ENZ metamaterials offers an alternative solution for highly compact arrays in full duplex communication and multiple‐input multiple‐output technology.

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A Self-Interference Suppression Structure for Collinear Dipoles

Cited by 16 publications

References 18 publications

A Lazy Learning-Based Self-Interference Cancellation Approach for In-Band Full-Duplex Wireless Communication Systems

A Lazy Learning-Based Self-Interference Cancellation Approach for In-Band Full-Duplex Wireless Communication Systems

Compact in‐band pattern diversity antenna for wireless applications

Decoupled Dipole Arrays Empowered by Invisible Complex Poles in Epsilon‐Near‐Zero Metamaterials

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