Wideband RF Self-Interference Cancellation Circuit for Phased Array Simultaneous Transmit and Receive Systems

Venkatakrishnan, Satheesh Bojja; Alwan, Elias A.; Volakis, John L.

doi:10.1109/access.2017.2788179

Cited by 65 publications

(27 citation statements)

References 25 publications

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“…The key technology behind the IBFD communication, SIC, can be divided into two steps: passive cancellation and active cancellation. In passive cancellation [ 53 , 54 , 55 , 56 ], the SI is canceled in the analog domain considering several parameters such as the distance between the transmit and the receive antennas, the wavelength of the signal, the absorption of the material, etc.…”

Section: Full-duplex Cognitive Radio: Listen and Talkmentioning

confidence: 99%

Spectrum Sensing for Cognitive Radio: Recent Advances and Future Challenge

Nasser

Hassan

Chaaya

et al. 2021

Sensors

137

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Spectrum Sensing (SS) plays an essential role in Cognitive Radio (CR) networks to diagnose the availability of frequency resources. In this paper, we aim to provide an in-depth survey on the most recent advances in SS for CR. We start by explaining the Half-Duplex and Full-Duplex paradigms, while focusing on the operating modes in the Full-Duplex. A thorough discussion of Full-Duplex operation modes from collision and throughput points of view is presented. Then, we discuss the use of learning techniques in enhancing the SS performance considering both local and cooperative sensing scenarios. In addition, recent SS applications for CR-based Internet of Things and Wireless Sensors Networks are presented. Furthermore, we survey the latest achievements in Spectrum Sensing as a Service, where the Internet of Things or the Wireless Sensor Networks may play an essential role in providing the CR network with the SS data. We also discuss the utilisation of CR for the 5th Generation and Beyond and its possible role in frequency allocation. With the advancement of telecommunication technologies, additional features should be ensured by SS such as the ability to explore different available channels and free space for transmission. As such, we highlight important future research axes and challenging points in SS for CR based on the current and emerging techniques in wireless communications.

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Section: Full-duplex Cognitive Radio: Listen and Talkmentioning

confidence: 99%

Spectrum Sensing for Cognitive Radio: Recent Advances and Future Challenge

Nasser

Hassan

Chaaya

et al. 2021

Sensors

137

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“…Different estimators are proposed for FDX systems to estimate the SI channel and perform cancellation at different stages of data recovery. The suppression of selfinterference is addressed at different stages of processing both in analog [12]- [18], and digital domains [19]- [27]. An additional receiver chain was proposed [12] to obtain a reference signal for digital SI cancellation.…”

Section: Related Workmentioning

confidence: 99%

Channel Estimators for Full-Duplex Communication Using Orthogonal Pilot Sequences

2020

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Full-duplex communication is desirable to maximize the spectral efficiency, despite the challenges it puts forth. The key challenge inhibiting the operation of radios in full-duplex mode is selfinterference. In this paper, we propose a pilot-based channel estimation to estimate both self-interference and communication channels simultaneously at both ends of a full-duplex link using orthogonal sequences. The Cramer-Rao Lower Bound for estimators of both the channels was determined and compared with the halfduplex channel estimator. We performed simulations varying sequence length and channel taps and studied the performance of the estimators. We also studied the effect of synchronization between the sequences on the performance of the estimators. Thus, providing a solution to balance the trade-off between the accuracy of the channel estimation and the overhead added to the transmissions for full-duplex communication. INDEX TERMS Channel estimation, orthogonal m-sequences, full-duplex (FDX), half-duplex (HDX), self-interference (SI), Cramer-Rao Lower Bound (CRLB).

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“…Previous such filters were inherently narrowband [4], [6], [31] and less tunable as they included only limited delay lines. In [7], [9], [23], we implemented static RF-FIR prototypes to achieve at least 20 dB cancellation across 500 MHz and 1 GHz. But by increasing the number of taps in a filter more variables are available for optimization, thus improving the cancellation bandwidth.…”

Section: A Static Rf Cancellermentioning

confidence: 99%

“…However, this was achieved over a narrow bandwidth (< 80 MHz) using not more than three cancellation stages. To overcome this shortcoming, a novel wideband STAR radio with 4 stages of cancellation was proposed in [7], [9], [23]. This STAR radio can achieve an unprecedented ∼ 120 dB of self-interference cancellation (SIC) across a bandwidth of 500 MHz.…”

Section: Introductionmentioning

confidence: 99%

Techniques for Achieving High Isolation in RF Domain for Simultaneous Transmit and Receive

Venkatakrishnan

Hovsepian

Johnson

et al. 2020

IEEE Open J. Antennas Propag.

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With the growth of wireless data traffic, additional spectrum is required to meet consumer demands. Consequently, innovative approaches are needed for efficient management of the available limited spectrum. To double the achievable spectral efficiency, a transceiver can be designed to receive and transmit signals simultaneously (STAR) across the same frequency band. However, due to the coupling of the high power transmitted signal into the collocated receiver, the receiver's performance is degraded. For successful STAR realization, the coupled highpower transmit (Tx) signal should be suppressed by 100-120 dB over the entire operational bandwidth. So far, most STAR implementations are narrowband, and not useful for ultra wideband (UWB) communications. In this paper, we present review of novel approaches employed to achieve improved cancellation across wide bandwidths in RF and propagation domains.Both single and multi-antenna systems are considered. Measurements show an average cancellation of 50 dB using two stages of RF signal cancellation.

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Wideband RF Self-Interference Cancellation Circuit for Phased Array Simultaneous Transmit and Receive Systems

Cited by 65 publications

References 25 publications

Spectrum Sensing for Cognitive Radio: Recent Advances and Future Challenge

Spectrum Sensing for Cognitive Radio: Recent Advances and Future Challenge

Channel Estimators for Full-Duplex Communication Using Orthogonal Pilot Sequences

Techniques for Achieving High Isolation in RF Domain for Simultaneous Transmit and Receive

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