Simultaneous RF Self-Interference Cancellation, Local Oscillator Generation, Frequency up- and down-Conversion in an Integrated In-Band Full-Duplex 5G RF Transceiver Front-End

Song, Haiping; Li, Xiaolei; Zhang, Yucheng; Huang, Linbojie; Cheng, Mengfan; Liu, Deming; Deng, Lei

doi:10.1109/jlt.2021.3117893

Cited by 10 publications

(4 citation statements)

References 23 publications

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“…When the programmable spectral processor is controlled to adjust the attenuation and phase shift to satisfy the amplitude and phase matching conditions shown in the following equation, the final pure signals output from BPD1 and BPD2 can be expressed as shown in Equations ( 17) and (18).…”

Section: Principlesmentioning

confidence: 99%

“…As device integration advances, the use of coherent light sources and devices such as electro-absorption modulators (EAMs) [14], dual-parallel Mach-Zehnder modulators (DP-MZMs) [15], and polarization division multiplexing Mach-Zehnder modulators (PDM-MZMs) [16], in conjunction with the reference signal reconstruction process for achieving SIC, has progressively gained prominence. Especially when facing the multifunctional integrated RF front-end and long-distance fiber transmission application requirements, the integration of SIC with down-conversion [17,18], periodic power fading suppression [19,20], image interference rejection [21,22], and other functions has become a research hotspot. Concurrently, schemes incorporating multipath SIC functions have also been proposed in [23] to address the intricacies and variability of signal propagation paths.…”

Section: Introductionmentioning

confidence: 99%

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A Microwave Photonic 2 × 2 IBFD–MIMO Communication System with Narrowband Self-Interference Cancellation

Ma,

Shi,

Fan

2024

Micromachines

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Combined in-band full duplex-multiple input multiple output (IBFD–MIMO) technology can significantly improve spectrum efficiency and data throughput, and has broad application prospects in communications, radar, the Internet of Things (IoT), and other fields. Targeting the self-interference (SI) issue in microwave photonic-based IBFD–MIMO communication systems, a microwave photonic self-interference cancellation (SIC) method applied to the narrowband 2 × 2 IBFD–MIMO communication system was proposed, simulated, and analyzed. An interleaver was used to construct a polarization multiplexing dual optical frequency comb with a frequency shifting effect, generating a dual-channel reference interference signal. The programmable spectrum processor was employed for filtering, attenuation, and phase-shifting operations, ensuring amplitude and phase matching to eliminate the two self-interference (SI) signals. The simulation results show that the single-frequency SIC depth exceeds 45.8 dB, and the narrowband SIC depth under 30 MHz bandwidth exceeds 32.7 dB. After SIC, the desired signal, employing a 4QAM modulation format, can be demodulated with an error vector magnitude (EVM) as low as 4.7%. Additionally, further channel expansion and system performance optimization are prospected.

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Section: Principlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Microwave Photonic 2 × 2 IBFD–MIMO Communication System with Narrowband Self-Interference Cancellation

Ma,

Shi,

Fan

2024

Micromachines

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“…Arbitrary function generator (AFG1) generates a reference signal at 20 GHz frequency with an arbitrary amplitude and 0 • initial phase. Signal from AFG1 is used to modulate PCPM1 [24]. It is operated at the modulation voltage of 2 V, splitting ratio of 1.4 and bias voltages V bias1PM1 = −2.8 V and V bias2PM1 = −3.2 V. Polarisation states of the 90 • phase shifted modulated signal is controlled by tuning azimuth and ellipticity angles of PCPM1.…”

Section: System Implementationmentioning

confidence: 99%

Non-linear photonic loop mirror based co-site interference canceller

Chandrasenan¹,

Zacharias²

2022

Laser Phys. Lett.

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Full duplex-in band (FDIB) is a well-established solution for increasing the data rate and spreading the link range for future communication systems. FDIB systems need no additional bandwidth requirement. However, they are confronted with a major interference challenge on the same site, called co-site interference (CSI). Long-established co-site interference cancellation (CSIC) methods achieve a cancellation depth upto 35 dB, conversely it has space containments, manufacturing imperfections, induces noise penalties and limits isolation bandwidth. To overcome these problems, RF photonic CSIC methods have been developed, which have produced 30 dB wide-band interference suppression. They also increase bandwidth, have a flexible structure, minimize losses and prevent periodic power fading. But these systems have a problem of inherent DC drift, low maintenance of coherence, and low isolation at low transmission power. Thus, there is a high need for photonic CSIC designs of FDIB systems that operate over wider bandwidths and at higher transmission powers. Here, a newfangled CSIC system based on a non-linear photonic loop and frequency down-conversion is proposed. It shows excellent CSIC suppression of greater than 61 dB, for a single frequency signal of interest (SOI) with maximum RF power of 13 dBm. Without frequency down-conversion, the system maintains an average cancellation depth of 62.541 dB for single frequency SOI. After frequency down conversion, the system maintains an average cancellation depth of 61.208 dB for narrow band SOI. The system attains 18% error vector magnitude at −20 dB RF output power, which confirms the comprehensive quality of the system.

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“…Some massive MIMO communication systems or phased array radar systems often integrate multiple RF transceiver chips [1,2,3,4], and these RF transceiver chips need to have their own independent local oscillator [5,6,7] sources. At the same time, it is necessary to design a synchronization [8,9] module to eliminate the phase uncertainty [10] between the local oscillators.…”

Section: Introductionmentioning

confidence: 99%

Multi-chip phase synchronization circuit of fractional-N PLL

Yang¹,

Wang²,

Liu³

et al. 2023

IEICE Electron. Express

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A digital integrated circuit to realize multi-chip phase synchronization of fractional-N PLL with local oscillator divider is designed. An offset of fractional frequency ratio is added in phase difference calculation, which effectively avoids the large calculation error under some special fractional frequency ratios. Different from traditional one-time synchronization, a synchronization method with tracking mode is proposed, which can further reduce the phase error. The test result of the chip finished in 65nm COMS shows that the method of tracking mode and adding the fractional frequency ratio's offset are effective to reduce the error of phase synchronization to about 0.2°.

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Simultaneous RF Self-Interference Cancellation, Local Oscillator Generation, Frequency up- and down-Conversion in an Integrated In-Band Full-Duplex 5G RF Transceiver Front-End

Cited by 10 publications

References 23 publications

A Microwave Photonic 2 × 2 IBFD–MIMO Communication System with Narrowband Self-Interference Cancellation

A Microwave Photonic 2 × 2 IBFD–MIMO Communication System with Narrowband Self-Interference Cancellation

Non-linear photonic loop mirror based co-site interference canceller

Multi-chip phase synchronization circuit of fractional-N PLL

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