28.6 Full-Duplex 2×2 MIMO Circulator-Receiver with High TX Power Handling Exploiting MIMO RF and Shared-Delay Baseband Self-Interference Cancellation

Dastjerdi, Mahmood Baraani; Jain, Sanket; Reiskarimian, Negar; Natarajan, Arun; Krishnaswamy, Harish

doi:10.1109/isscc.2019.8662515

Cited by 15 publications

(9 citation statements)

References 5 publications

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“…Various techniques to realize integrated time-domain RF cancellers through different implementations of true-time delays in ICs have been proposed [15], [16], [28], [44], [46], [57]. Transmission lines are the most basic elements which provide true-time delays across a wide bandwidth.…”

Section: ) Integrated Time-domain Rf Cancellersmentioning

confidence: 99%

“…We present a detailed overview of two types of SI cancellers using different approaches: (i) time-domain cancellers (in the RF and/or analog BB domains) employing parallel delay line (DL) taps, and (ii) frequency-domain cancellers (in the RF domain) employing parallel RF bandpass filter (BPF) taps. Although both types of cancellers have been realized and demonstrated in practical systems (e.g., [7], [41]- [43]), we focus on their recent implementations in ICs [15], [16], [28], [29], [38], [39], [44]- [70]. For quantitative and fair comparison similar to the integrated antenna interfaces, we define two FOM for integrated cancellers: (i) the canceller efficiency, and (ii) the SIC-FBW product.…”

Section: Introductionmentioning

confidence: 99%

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A Survey and Quantitative Evaluation of Integrated Circuit-Based Antenna Interfaces and Self-Interference Cancellers for Full-Duplex

Chen

Garikapati

Nagulu

et al. 2021

IEEE Open J. Commun. Soc.

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Full-duplex (FD) wireless -simultaneous transmission and reception on the same frequency -is a promising technique that can significantly improve spectrum efficiency and reduce communication latency in future wireless networks. To enable FD operation, the powerful self-interference (SI) signal leaking from the transmitter (TX) into the receiver (RX) needs to be suppressed and canceled to an extreme degree at the antenna interface as well as in the RF/analog and digital domains. Various approaches to achieve TX-RX isolation at the antenna interface and SI cancellation (SIC) in the RF/analog and digital domains have been demonstrated, with a focus on using bench-top off-the-shelf components. Recent advances in integrated circuit (IC) implementations of various types of shared antenna interfaces and cancellers in the RF and/or analog baseband (BB) domains have further pushed the frontier of realizing FD wireless in small-form-factor/hand-held devices. Moreover, it is still important to fundamentally study the SIC performance that can be achieved by different types of cancellers. In this paper, we present a first-of-its-kind comprehensive overview on the implementation and comparison of various state-of-theart integrated shared antenna interfaces and SI cancellers in both the RF and analog BB domains. We define two figures of merit (FOM) for the IC-based shared antenna interfaces and SI cancellers, which capture various design considerations and performance tradeoffs including the achievable isolation/SIC, bandwidth, noise figure degradation, TX/SI power handling, and power consumption. In particular, we focus on two types of integrated shared antenna interfaces including electrical-balance duplexers and circulators. We also discuss two types of SI cancellers based on the time-domain and frequency-domain approaches, which respectively employ parallel delay lines and bandpass filters to emulate the SI channel. Based on realistic measurements, we perform extensive numerical evaluations to illustrate and compare the achievable RF SIC performance in different scenarios, as well as discuss various design tradeoffs. Finally, we provide an overview of the IC-based implementations and performance evaluations of both types of cancellers based on our recent work. INDEX TERMS Full-duplex wireless, integrated circuit (IC), antenna interface, self-interference cancellation, systems and testbeds. TINGJUN CHEN (Member, IEEE) received the B.Eng. degree in electronic engineering from Tsinghua University in 2014, and the Ph.D. degree in electrical engineering from Columbia University in 2020. He is an Assistant Professor with the Department of Electrical and Computer Engineering, Duke University and was a Postdoctoral Associate with Yale University from 2020 to 2021. His research interests are in the area of networking and communications with a specific focus on next-generation wireless networks and Internet-of-Things systems.

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Section: ) Integrated Time-domain Rf Cancellersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Survey and Quantitative Evaluation of Integrated Circuit-Based Antenna Interfaces and Self-Interference Cancellers for Full-Duplex

Chen

Garikapati

Nagulu

et al. 2021

IEEE Open J. Commun. Soc.

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“…[6] demonstrated how full duplex gains scale with MIMO for a 3×3 antenna Wi-Fi systems as well as highlighted the subtle differences from just extending the simple SISO full duplex system approach on a PCB. [9,18,57] presented initial designs of MIMO full duplex capable ICs but the end-to-end evaluation of the performance is limited. [3,68] use clever beamforming and nulling techniques to enable Full Duplex MIMO operation for isolating the TX and RX streams for Massive MIMO base stations, however they sacrifice some of the spatial multiplexing gains while doing so.…”

Section: Related Workmentioning

confidence: 99%

Full Duplex Radios

Singh

Gadre

Kumar

2020

Proceedings of the 19th ACM Workshop on Hot Topics in Networks

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Full duplex communication has been well explored in the past decade, with several physical layer designs proposed for effectively doubling the throughput of mobile devices. However, these systems are far from being well-deployed in the Wi-Fi and cellular applications, where most of the research has been done. In this paper, we investigate some of the fundamental pragmatic challenges in deploying full duplex that explain the reluctance from industry players in deploying this feature in commercial end-user devices and base stations at a large scale. Upon doing so, we identify that the problems lie not quite at the radio layer-but at layers below and above it. At the hardware layer, we find that the power and complexity of IC-implementations of full duplex far exceeds that of other existing technologies that achieve similar throughput gain, such as multiuser MIMO. We further identified how higher-layer cellular and Wi-Fi traffic patterns and MAC protocols are fundamentally ill-suited to the full duplex paradigm. We report empirical analysis from the power consumption of an IC-implementation of a full duplex cancellation circuit, demonstrating that full duplex cancellation circuitry would consume at least 57% more power than a MIMO system achieving identical throughput gains. We also show how current traffic patterns reduce the benefits of full duplex to 1.25× instead of the expected 2×. CCS CONCEPTS • Networks → Network performance analysis; Network components; • Theory of computation → Circuit complexity; • Hardware → Integrated circuits; Circuits power issues.

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“…In [38] and some practices, FD is implemented on a single antenna. It assumes special circuits that can measure and cancel the feedback signals.…”

Section: Implementation Issues and Assumptionsmentioning

confidence: 99%

“…Our assumption has been widely accepted in MIMO and full-duplex literature. If we assume the cancellation circuit block like in [38], we do not need an additional antenna for removing the feedback signals and the number of required antennas decrease by 1.…”

Section: Implementation Issues and Assumptionsmentioning

confidence: 99%

Optimal Collaborative Spectrum Sharing for a Cognitive Multi-Antenna Relay With Full-Duplex Capability and Stability Constraint

Choi

Kim

2020

IEEE Access

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Collaborative spectrum sharing (CSS) between primary and secondary users (PU and SU) is an effective way of utilizing limited radio spectrum. In CSS, cognitive SU acts as a relay for PU, which facilitates the PU to send its packet with a lower error probability by the help of the SU, and consequently, the SU has more chances to find a vacant spectrum. When SU is equipped with multiple antennas, it can further efficiently utilize the radio spectrum by adopting a growing self-interference cancelation technique for full-duplex (FD) transmission. In this paper, both an aggressive and a passive secondary usage of the spectrum are proposed, the operational principles of which are defined using spectrum-sharing probability φ in FD CSS environments. For the spectrum-sharing probability φ, SU for each of the methods sends its own signal and the PU's (relayed) signal together by using superposition transmission. For the remaining probability 1 − φ, the two methods work differently: SU sends its own signal only in the aggressive mode while it sends only the relaying signal for PU in the passive mode. We formulate an FD CSS problem with various physical-layer parameters and the proposed operating modes as a function of the spectrum-sharing probability. Our goal is to maximize the secondary stable throughput while keeping a primary traffic constraint. Closed-form optimal solutions on φ are provided in the paper, the value of which heavily depends on the primary traffic volume, the operating modes, the relative locations of the collaborative nodes and the transmit power budget at SU. The analytical results in the paper are verified with numerical investigation, and the performance enhancement by the proposed methods is evaluated in comparison with benchmark systems. The results show that the aggressive mode is promising if SU has a relatively small transmit power and the primary traffic load is low, while the passive mode is suitable when the primary traffic load is high. INDEX TERMS Spectrum sharing, cognitive/collaborative mobile nodes, full-duplex capability, stability analysis.

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28.6 Full-Duplex 2×2 MIMO Circulator-Receiver with High TX Power Handling Exploiting MIMO RF and Shared-Delay Baseband Self-Interference Cancellation

Cited by 15 publications

References 5 publications

A Survey and Quantitative Evaluation of Integrated Circuit-Based Antenna Interfaces and Self-Interference Cancellers for Full-Duplex

A Survey and Quantitative Evaluation of Integrated Circuit-Based Antenna Interfaces and Self-Interference Cancellers for Full-Duplex

Full Duplex Radios

Optimal Collaborative Spectrum Sharing for a Cognitive Multi-Antenna Relay With Full-Duplex Capability and Stability Constraint

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