Integrated full duplex radios

Zhou, Jin; Reiskarimian, Negar; Diakonikolas, Jelena; Dinç, Tolga; Chen, Tingjun; Zussman, Gil; Krishnaswamy, Harish

doi:10.1109/mcom.2017.1600583

Cited by 148 publications

(48 citation statements)

References 15 publications

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“…However, RF cancellers achieving wideband SIC (e.g., [12,34]) rely on transmission-line delays, which cannot be realized in small-form-factor nodes and/or integrated circuits (ICs) due to the required length for generating nanosecond-scale time delays and the lossy nature of the silicon substrate. 1 A compact IC-based design is necessary for supporting FD in hand-held devices (e.g., handsets and tablets) [35,44,48,49]. Specifically, recent advances in the RFIC community allowed achieving wideband RF SIC in IC implementations based on the technique of frequency-domain equalization (FDE) [48].…”

Section: Introductionmentioning

confidence: 99%

Wideband Full-Duplex Wireless via Frequency-Domain Equalization

Chen

Dastjerdi

Zhou

et al. 2019

The 25th Annual International Conference on Mobile Computing and Networking

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Full-duplex (FD) wireless can significantly enhance spectrum efficiency but requires tremendous amount of selfinterference (SI) cancellation. Recent advances in the RFIC community enabled wideband RF SI cancellation (SIC) in integrated circuits (ICs) via frequency-domain equalization (FDE), where RF filters channelize the SI signal path. Unlike other FD implementations, that mostly rely on delay lines, FDE-based cancellers can be realized in small-formfactor devices. However, the fundamental limits and higher layer challenges associated with these cancellers were not explored yet. Therefore, and in order to support the integration with a software-defined radio (SDR) and to facilitate experimentation in a testbed with several nodes, we design and implement an FDE-based RF canceller on a printed circuit board (PCB). We derive and experimentally validate the PCB canceller model and present a canceller configuration scheme based on an optimization problem. We then extensively evaluate the performance of the FDE-based FD radio in the SDR testbed. Experiments show that it achieves 95 dB overall SIC (52 dB from RF SIC) across 20 MHz bandwidth, and an average link-level FD gain of 1.87×. We also conduct experiments in: (i) uplink-downlink networks with inter-user interference, and (ii) heterogeneous networks with half-duplex and FD users. The experimental FD gains in the two types of networks confirm previous analytical results. They depend on the users' SNR values and the number of FD users, and are 1.14×-1.25× and 1.25×-1.73×, respectively. Finally, we numerically evaluate and compare the RFIC and PCB implementations and study various design tradeoffs.

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Section: Introductionmentioning

confidence: 99%

Wideband Full-Duplex Wireless via Frequency-Domain Equalization

Chen

Dastjerdi

Zhou

et al. 2019

The 25th Annual International Conference on Mobile Computing and Networking

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“…6 The results show that all the scheduling algorithms are throughput-optimal under different choices of f (x) that satisfy the conditions in Theorem 4.1. Overall, the delay performance of Q-CSMA in HD-FD networks has less dependency on f (x) 6 The results in the cases with f (x) = √ x and f (x) = x are almost identical (see Fig. 7) and thus omitted in Table I.…”

Section: Impact Of the Weight Function F (X)mentioning

confidence: 88%

“…There has been extensive work dedicated to physical layer FD radio/system design and implementation [3], [4], [6], [8], [14] (see also the review in [2] and references therein), and open-access FD radio design based on [15] has been integrated with the ORBIT wireless testbed [16]. Recent research also focused on characterizing and quantifying achievable throughput improvements and rate regions of FD networks in both single-channel and multi-channel cases with realistic imperfect SIC [17]- [19].…”

Section: Related Workmentioning

confidence: 99%

Hybrid Scheduling in Heterogeneous Half-and Full-Duplex Wireless Networks

Chen

Diakonikolas

Ghaderi

et al. 2018

IEEE INFOCOM 2018 - IEEE Conference on Computer Communications

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Full-duplex (FD) wireless is an attractive communication paradigm with high potential for improving network capacity and reducing delay in wireless networks. Despite significant progress on the physical layer development, the challenges associated with developing medium access control (MAC) protocols for heterogeneous networks composed of both legacy half-duplex (HD) and emerging FD devices have not been fully addressed. Therefore, we focus on the design and performance evaluation of scheduling algorithms for infrastructure-based heterogeneous HD-FD networks (composed of HD and FD users). We first show that centralized Greedy Maximal Scheduling (GMS) is throughput-optimal in heterogeneous HD-FD networks. We propose the Hybrid-GMS (H-GMS) algorithm, a distributed implementation of GMS that combines GMS and a queue-based random-access mechanism. We prove that H-GMS is throughputoptimal. Moreover, we analyze the delay performance of H-GMS by deriving lower bounds on the average queue length. We further demonstrate the benefits of upgrading HD nodes to FD nodes in terms of throughput gains for individual nodes and the whole network. Finally, we evaluate the performance of H-GMS and its variants in terms of throughput, delay, and fairness between FD and HD users via extensive simulations. We show that in heterogeneous HD-FD networks, H-GMS achieves 16-30× better delay performance and improves fairness between HD and FD users by up to 50% compared with the fully decentralized Q-CSMA algorithm.

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“…Non-reciprocal components, such as circulators, isolators, gyrators and non-reciprocal phase-shifters, are critical for various RF and mm-wave applications, including communications, radar, imaging and sensing. Specifically, high-performance circulators can find application as the shared-antenna interface of transceivers for emerging wireless communication paradigms such as full-duplex (FD) [2]- [4] and FD multipleinput multiple-output (MIMO) systems [5], and in frequencymodulated continuous-wave (FMCW) radar. FD aims to instantly double the link capacity in the physical layer by simultaneously transmitting and receiving at the same frequency, as well as providing other benefits in the higher layers [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Integrated Conductivity-Modulation-Based RF Magnetic-Free Nonreciprocal Components: Recent Results and Benchmarking

Reiskarimian

Nagulu

Dinç

et al. 2018

Antennas Wirel. Propag. Lett.

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Achieving non-reciprocity and building nonreciprocal components through spatio-temporal modulation of material properties has attracted a lot of attention in the recent past as an alternative to the more traditional approach of exploiting Faraday rotation in magnetic materials. In this letter, we review recent research on spatio-temporal conductivity-modulation, which enables low-loss, small-footprint, wide-bandwidth and high-power-handling non-reciprocal components operating from radio frequencies (RF) to millimeter-waves (mm-waves) and integrated in a CMOS platform. Four generations of non-reciprocal circulators and circulator-based systems will be reviewed. We will also discuss metrics of performance that are important for wireless applications and standards, and introduce a new antenna (ANT) interface efficiency figure of merit (ηANT ) to enable a fair comparison between various types of antenna interfaces.

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Integrated full duplex radios

Cited by 148 publications

References 15 publications

Wideband Full-Duplex Wireless via Frequency-Domain Equalization

Wideband Full-Duplex Wireless via Frequency-Domain Equalization

Hybrid Scheduling in Heterogeneous Half-and Full-Duplex Wireless Networks

Integrated Conductivity-Modulation-Based RF Magnetic-Free Nonreciprocal Components: Recent Results and Benchmarking

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