Simultaneous Sending and Receiving

Alexanderson, E. F. W.

doi:10.1109/jrproc.1919.217452

Cited by 10 publications

(4 citation statements)

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“…The quantity δ studied in this work is approximately proportional to the normalized coupled power when the coupling is weak, as defined in (1) and (2). Therefore, δ is referred to as the weak-coupling density.…”

Section: Coupling Visualization Using the Reaction Theoremmentioning

confidence: 99%

“…This makes mutual coupling between antennas one of the key parameters for antenna system performance [1], in particular for antennas on vehicles where the distance between antennas is strongly constrained. Methods to reduce mutual coupling between antennas date back to early antenna constructions [2]. A few recent publications on the subject include [3], [4] that utilized parasitic elements and [5]- [7], where electromagnetic bandgap structures [8] have been used.…”

Section: Introductionmentioning

confidence: 99%

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Visualization and Reduction of Mutual Coupling Between Antennas Installed on a Platform

Lundgren¹,

Malmström²,

Hannula³

et al. 2021

Preprint

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Mutual coupling, or equivalently, the isolation between antennas, is a key parameter in antenna system design. In this work, a new quantity is proposed to obtain spatial information about mutual coupling. The new quantity is named the weak-coupling density. This quantity is a real-valued scalar and can be visualized as a three-dimensional density in space. It is also shown that there is a strong correlation between regions with a positive (negative) weak-coupling density and decreasing (increasing) the coupling when placing an absorber in that region. This predictive ability is a useful feature, which is tested here for three numerical cases. The results are robust to the shape of the platform, and it persists over neighboring frequencies. By placing absorbers based on the weak-coupling density, it is possible to reduce the required amount of absorbers to obtain a certain mutual coupling reduction. The visualization results and predictions of absorber positions are compared with a Poynting vector based method. Placing absorbers based on the weak-coupling density had a larger impact on the mutual coupling, compared to the predictions with the Poynting vector based method in the investigated cases.

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Section: Coupling Visualization Using the Reaction Theoremmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Visualization and Reduction of Mutual Coupling Between Antennas Installed on a Platform

Lundgren¹,

Malmström²,

Hannula³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…This limitation has spurred the necessity for efficient spectrum access techniques such as in-band full-duplex (IBFD) or simultaneous transmit and receive (STAR) [5]- [7]. The latter enables a cellular network to transmit and receive simultaneously over the same frequency band [8]. As such, STAR enables frequency re-use.…”

Section: Introductionmentioning

confidence: 99%

A Two-Stage Wideband RF Cancellation of Coupled Transmit Signal for Bi-Static Simultaneous Transmit and Receive System

Tarek

Hokayem²,

Govindarajulu

et al. 2022

IEEE J. Microw.

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Wireless technology is growing at a fast rate to accommodate the expanding user demands. Currently, the radio frequency (RF) spectrum is overcrowded. Hence, it is more susceptible to signal fratricide and interference. To enhance spectrum access, in-band full duplex systems are implemented to achieve simultaneous transmission and reception (STAR) and double the spectral efficiency. However, STAR systems require suppression of the high power transmit signals that can leak into the receiver chain. This type of self-interference (SI) can significantly reduce the receiver.s dynamic range and often leads to its desensitization. Therefore, successful STAR implementation requires considerable isolation between the transmitter and receiver to reduce the SI signal. To do so, RF self-interference cancellation (RFSIC) stages are considered. In this paper, we present a two-stage SIC system that includes transmit and receive antennas isolation and RFSIC filter stages. Notably, the isolation between the transmit and receive antennas is based on a novel symmetric suppression technique. The RFSIC filter is based on a hybrid finite impulse response (FIR) filter and resonator architecture. Adding a resonator to the FIR filter provides improved matching to approximate and suppress the direct SI coupling. Our design achieves ∼52 dB isolation on average across a 500 MHz bandwidth (viz. 1-1.5 GHz) in simulation. Simulation results show a minimum cancellation of 41 dB and a maximum cancellation of 65 dB. A prototype was fabricated and tested, showing an average of ∼ 44 dB cancellation which is in good agreement with our simulation.INDEX TERMS Coupling signal, in-band full duplex (IBFD), STAR, self-interference cancellation (SIC).

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“…The implementation of the IBFD system is extremely challenging because of the strong selfinterference (SI) that leaks from the transmitting to the receiving chains [5]- [7]. In many cases, the SI is ∼ 60-90dB stronger than the desired received signal [8]. Typically, the SI includes coupled direct, noise, and reflected/multipath signals, in addition to harmonics from the power amplifier (PA).…”

Section: Introductionmentioning

confidence: 99%

Wideband, Low Profile Coupling Suppression Circuit for Simultaneous Transmit and Receive System Based on Hybrid Finite Impulse Response and Resonator Topology

Tarek

Alwan

2022

IEEE Access

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In-band full-duplex (IBFD) systems can double the spectral efficiency by enabling simultaneous transmission and reception within the same band. Key to realizing full-duplex radios is the cancellation of the self-interference (SI) that couples from the transmitting antenna into the receiving path. This is done by introducing a self-interference cancellations (SIC) circuit to significantly reduce the coupled transmit signal and avoid receiver's desensitization. Additionally, SI suppression becomes more challenging across broader bandwidths. This paper presents a novel, wideband, and low profile SIC circuit based on a hybrid Finite Impulse Response (FIR) and resonator filter topology. The latter is optimized to provide an average of 22dB cancellation across 800MHz in the L-band. Conventional, SIC circuits require a filter bank with at least two FIR filters to achieve such a wide bandwidth. Conversely, our FIR resonator design is low profile with a circuit size nearly half of that of a filter bank. Simulations show a minimum cancellation of 15dB and a maximum cancellation of 45dB. A prototype was fabricated and tested, showing an average of ∼ 20dB cancellation which is in good agreement with our simulation. Further, measured results show a minimum cancellation of 15dB and maximum cancellation of 27dB.

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Simultaneous Sending and Receiving

Cited by 10 publications

References 0 publications

Visualization and Reduction of Mutual Coupling Between Antennas Installed on a Platform

Visualization and Reduction of Mutual Coupling Between Antennas Installed on a Platform

A Two-Stage Wideband RF Cancellation of Coupled Transmit Signal for Bi-Static Simultaneous Transmit and Receive System

Wideband, Low Profile Coupling Suppression Circuit for Simultaneous Transmit and Receive System Based on Hybrid Finite Impulse Response and Resonator Topology

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