A Cancellation Network for Full-Duplex Front End Circuit

Chan, Yee Kit; Koo, Voon Chet; Chung, Boon-Kuan; Chuah, H. T.

doi:10.2528/pierl09022305

Cited by 9 publications

(5 citation statements)

References 31 publications

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“…These multiple antenna techniques achieve up to 40 dB of isolation, but prevent dense integration due to the required physical distances between the antennas. An alternative technique which uses one antenna for simultaneous transmission and reception, relies on a circulator to isolate the receiver from the transmitter [18], [19]. Unfortunately, circulators provide a moderate isolation between TX and RX of about 20 dB, they show nonlinear behavior and they are considered bulky and expensive for consumer equipment operating below 6 GHz.…”

Section: Introductionmentioning

confidence: 99%

Analog/RF Solutions Enabling Compact Full-Duplex Radios

Debaillie

Broek

Lavín

et al. 2014

IEEE J. Select. Areas Commun.

240

174

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In-band full-duplex sets challenging requirements for wireless communication radios, in particular their capability to prevent receiver sensitivity degradation due to self-interference (transmit signals leaking into its own receiver). Previously published self-interference rejection designs require bulky components and/or antenna structures. This paper addresses this form-factor issue. First, compact radio transceiver feasibility bottlenecks are identified analytically, and tradeoff equations in function of link budget parameters are presented. These derivations indicate that the main bottlenecks can be resolved by increasing the isolation in analog/RF. Therefore, two design ideas are proposed, which provide attractive analog/RF-isolation and allow integration in compact radios. The first design proposal targets compact radio devices, such as small-cell base stations and tablet computers, and combines a dual-port polarized antenna with a self-tunable cancellation circuit. The second design proposal targets even more compact radio devices such as smartphones and sensor network nodes. This design builds on a tunable electrical balance isolator/duplexer in combination with a single-port miniature antenna. The electrical balance circuit can be implemented for scaled CMOS technology, facilitating low cost and dense integration.Index Terms-In-band full-duplex, self-interference isolation, dual polarized antenna, tunable duplexer, electrical balance, transceiver macro-modeling.

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Section: Introductionmentioning

confidence: 99%

Analog/RF Solutions Enabling Compact Full-Duplex Radios

Debaillie

Broek

Lavín

et al. 2014

IEEE J. Select. Areas Commun.

240

174

View full text Add to dashboard Cite

show abstract

“…Such filters cannot be applied to enable FD duplexing as there is no frequency spacing between the transmitted and received signals. Some FD designs propose a circulator to route the TX and RX signals over the common antenna [3,13]. However, such circulators provide a moderate isolation (~20dB) and would require additional cancellation loops at RF.…”

Section: Electrical Balance Duplexermentioning

confidence: 99%

RF Self-Interference Reduction Techniques for Compact Full Duplex Radios

Debaillie

Broek

Lavín

et al. 2015

2015 IEEE 81st Vehicular Technology Conference (VTC Spring)

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This paper describes three RF self-interference reduction techniques for full-duplex wireless links, which specifically target integration in compact radios. Concretely, a self-interference cancelling front-end, a dual-polarized antenna, and an electrical balance duplexer are proposed. Each technique offers specific benefits in terms of implementation density, selfinterference rejection, bandwidth and flexibility. Depending on their characteristics, they can be adopted in different nextgeneration full-duplex applications and standards. All concepts are prototyped, and achieve at least 45dB of self-interference reduction over more than 10MHz bandwidth.Index Terms-Full-duplex wireless, self-interference, polarized antenna, electrical balance duplexer, analog cancellation.

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“…Passive cancellation is typically done at the antenna level (e.g., using a circulator [20], [26]). Active cancellation involves subtracting an estimate of the selfinterference at the receiver in either analog domain, digital domain, or both (e.g., [27], [28], and [29], respectively).…”

Section: Introductionmentioning

confidence: 99%

“…While recent research has focused on precoding design techniques, more typical FD transceiver design approaches focus on either passive (e.g., [20]- [23]) or active (e.g., [24], [25]) cancellation techniques. Passive cancellation is typically done at the antenna level (e.g., using a circulator [20], [26]).…”

Section: Introductionmentioning

confidence: 99%

MIMO Full-Duplex Precoding: A Joint Beamforming and Self-Interference Cancellation Structure

Huberman

Le‐Ngoc

2015

IEEE Trans. Wireless Commun.

100

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This paper presents a single-or multi-user MultipleInput-Multiple-Output (MIMO) Full-Duplex (FD) precoding transceiver structure applicable for single-carrier and Orthogonal Frequency Division Multiplexing (OFDM) systems. The structure increases the dimensionality at the transmitter, which allow for the cancellation of self-interference and forward beamforming to be jointly processed using precoding at the transmitter. The FD Precoding (FDP) structure allows for various joint precoding algorithms and different optimization objectives. We present separate and joint precoding designs for sum-rate maximization and a theoretical analysis of when the separate design is optimal. The joint designs make use of Sequential Convex Programming (SCP). Extensive simulation results using both channel models and measured data show that the FDP structure can provide very significant performance gains over existing techniques for both SU-and MU-MIMO systems. In particular, the FDP structure provides between 1.6 and 1.8 times the spectral efficiency of optimized half-duplex for many of the tested SU-MIMO scenarios.

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A Cancellation Network for Full-Duplex Front End Circuit

Cited by 9 publications

References 31 publications

Analog/RF Solutions Enabling Compact Full-Duplex Radios

Analog/RF Solutions Enabling Compact Full-Duplex Radios

RF Self-Interference Reduction Techniques for Compact Full Duplex Radios

MIMO Full-Duplex Precoding: A Joint Beamforming and Self-Interference Cancellation Structure

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