Optical Multipath RF Self-Interference Cancellation Based on Phase Modulation for Full-Duplex Communication

Su, Xinxin; Han, Xiuyou; Fu, Shuanglin; Wang, Shuo; Li, Chao; Tan, Qinggui; Zhu, Guangxi; Wang, Chao; Wu, Zhenlin; Gu, Yiying; Zhao, Mingshan

doi:10.1109/jphot.2020.3002856

Cited by 27 publications

(10 citation statements)

References 32 publications

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“…Their ability of cancelling multi-path SI signal is also limited by the modest tap counts. The exception to that is the twenty-tap system in [25]. The cancellation depth of 20dB over 1GHz bandwidth and 25dB over 500MHz were achieved.…”

Section: Introductionmentioning

confidence: 93%

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Optical Multi-Tap RF Canceller for In-Band Full-Duplex Wireless Communication Systems

Xing

Chen

et al. 2022

IEEE Photonics J.

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In-band full-duplex (IBFD) technology has become important for future wireless communications, due to its ability of increasing the radio-frequency (RF) spectrum efficiency. However, the benefits can only be realized if the self-interference (SI) is sufficiently suppressed. RF cancellation is important for IBFD systems due to its ability of SI mitigation. But it becomes more difficult for RF cancellation while the frequency and bandwidth increase. In real scenarios, the response of the multipath SI channel is not frequency-flat, which also limits the cancellation performance. To solve these problems, we present a photonic-enabled multi-tap RF canceller in this paper. The proposed RF canceller has the ability of cancelling multi-path SI. The tap coefficients are precisely adjusted by optical spectrum processing. A prototype system with 8 taps is demonstrated in this paper. The measured results show 25dB average cancellation depth over 1GHz cancellation bandwidth under over-the-air conditions. To verify the signal of interest (SOI) recovery capability of the novel RF canceller, an IBFD wireless communication experiment based on 16-quadrature amplitude modulation (16-QAM) was demonstrated, the SOI was successfully recovered.

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Section: Introductionmentioning

confidence: 93%

“…After processing in the optical domain, the reference signal is well-matched to SI signal and subtract it. Schemes have previously been proposed with direct laser modulation [13]- [14], external optical intensity modulation [15]- [21], external polarization modulation [22]- [23], and phase modulation [24]- [25].…”

Section: Introductionmentioning

confidence: 99%

Optical Multi-Tap RF Canceller for In-Band Full-Duplex Wireless Communication Systems

Xing

Chen

et al. 2022

IEEE Photonics J.

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“…8, analog SIC typically exists as a digitally-controlled analog filter placed between the transmitter and receiver of a full-duplex transceiver. Analog SIC filters come in many forms, existing as RF, intermediate frequency, and baseband circuitry, and even as optical filters [2,23,[30][31][32]. Analog SIC is often driven by the tapping off a small portion of the upconverted RF transmit signal.…”

Section: Analog Self-interference Cancellationmentioning

confidence: 99%

Full-Duplex Transceivers for Next-Generation Wireless Communication Systems

Roberts¹,

Suraweera²

2022

Preprint

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Wireless communication systems can be enhanced at the link level, in medium access, and at the network level when transceivers are equipped with fullduplex capability: the transformative ability to simultaneously transmit and receive over the same frequency spectrum. Effective methods to cancel self-interference are required to facilitate full-duplex operation, which we overview herein in the context of traditional radios, along with those in next-generation wireless networks. We highlight advances in self-interference cancellation that leverage machine learning, and we summarize key considerations and recent progress in full-duplex millimeterwave systems and their application in integrated access and backhaul. We present example design problems and noteworthy findings from recent experimental research to introduce and motivate the advancement of full-duplex millimeter-wave systems. We conclude this chapter by forecasting the future of full-duplex and outlining important research directions that warrant further study.

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“…These technologies, however, are frequently limited in operating frequency and bandwidth due to the electronic bottleneck. Because microwave photonic technology [6] can overcome the inherent defects of the electrical-based solutions, photonics-assisted selfinterference cancellation (SIC) has been widely studied in the past few years [7][8][9][10][11][12][13][14]. In [7][8][9][10][11], the strong direct-path SI signal was taken into consideration, and the SIC methods proposed in [7,9,11] can also overcome the influence of fiber dispersion when the SIC system was combined with fiber transmission.…”

Section: Introductionmentioning

confidence: 99%

“…In [7][8][9][10][11], the strong direct-path SI signal was taken into consideration, and the SIC methods proposed in [7,9,11] can also overcome the influence of fiber dispersion when the SIC system was combined with fiber transmission. In [12][13][14], different methods for multipath SIC were proposed, whose essence was to replicate the single-path SIC schemes in different dimensions to achieve independent cancellation of SI signals on different paths. The complexity of the system is closely related to the number of paths of the multipath SI signal, which limits the feasibility of such methods in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Digitally assisted photonic analog domain self-interference cancellation for in-band full-duplex MIMO systems via the LS algorithm with adaptive order

Han¹,

Chen²

2022

Opt. Lett.

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A digitally assisted photonic analog domain self-interference cancellation (SIC) and frequency downconversion method is proposed for in-band full-duplex multiple-input multiple-output (MIMO) systems using the least square (LS) algorithm with adaptive order. The SIC and frequency downconversion are achieved in the optical domain via a dual-parallel Mach–Zehnder modulator, while the downconverted signal is processed by the LS algorithm with adaptive order that is used to track the response of the multipath self-interference (SI) channel and reconstruct the reference signal for SIC. The proposed method can overcome the reconstruction difficulty of the multipath analog reference signal for SIC with high complexity in the MIMO scenario and can also solve the problem that the order of the reference reconstruction algorithm is not optimized when the wireless environment changes. An experiment is carried out to verify the concept. SIC depths of 30.2, 26.9, 23.5, 19.5, and 15.8 dB are achieved when the SI signal has a carrier frequency of 10 GHz and baud rates of 0.1, 0.25, 0.5, 1, and 2 Gbaud, respectively. The convergence of the LS algorithm with adaptive order is also verified for different MIMO multipath SI signals.

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Optical Multipath RF Self-Interference Cancellation Based on Phase Modulation for Full-Duplex Communication

Cited by 27 publications

References 32 publications

Optical Multi-Tap RF Canceller for In-Band Full-Duplex Wireless Communication Systems

Optical Multi-Tap RF Canceller for In-Band Full-Duplex Wireless Communication Systems

Full-Duplex Transceivers for Next-Generation Wireless Communication Systems

Digitally assisted photonic analog domain self-interference cancellation for in-band full-duplex MIMO systems via the LS algorithm with adaptive order

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