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Analysis of RF Feedback Chain Isolation in Wireless Co-Time Co-Frequency Full Duplex 认领 引用 被引量：1
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作者 Juan Zhou Ying Shen +1 位作者 Ya-Juan Xue Li Li 《Journal of Electronic Science and Technology》 EI CAS CSCD 2018年第3期280-286,共7页
By employing a radio frequency(RF) feedback chain, the self-interference can be canceled efficiently in co-time co-frequency full duplex(CCFD). However, the evitable signal crosstalk which is caused by the imperfect R... By employing a radio frequency(RF) feedback chain, the self-interference can be canceled efficiently in co-time co-frequency full duplex(CCFD). However, the evitable signal crosstalk which is caused by the imperfect RF feedback chain isolation usually damages the self-interference cancelation(SIC) performance. To deal with this problem, firstly, we analyze the impact of RF feedback chain isolation on SIC performance. Then a digital preprocessing scheme with RF feedback chain is proposed in the multiple-antenna CCFD architecture. Using both analytical and experimental methods, we find that the proposed scheme achieves a better performance on SIC. 展开更多
关键词 Co-time co-frequency full duplex full duplex radio frequency feedback chain isolation radio frequency leakage signal self-interference cancellation
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Towards frequency adaptation for delayed feedback deep brain stimulations 认领 引用
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作者 Mohammad Daneshzand Miad Faezipour Buket D.Barkana 《Neural Regeneration Research》 SCIE CAS CSCD 2018年第3期408-409,共2页
In neurodegenerative disorders such as Parkinson＇s disease （PD）, deep brain stimulation （DBS） is a desirable approach when the medication is less effective for treating the symptoms. DBS incorporates transferring... In neurodegenerative disorders such as Parkinson＇s disease （PD）, deep brain stimulation （DBS） is a desirable approach when the medication is less effective for treating the symptoms. DBS incorporates transferring electrical pulses to a specific tissue of the central nervous system, obtaining therapeutic results by modulating the neuronal activity of that region. DBS has certain advantages such as reversibility and adjustability features over medication, since the neuronal firing patterns can be recorded and used to alter the parameters of the DBS signal （Benabid et al., 2009）. One of the DBS indications is its ability to suppress the abnormal neuronal activity to treat symptoms like tremor, akinesia and dystonia. 展开更多
关键词 Figure DBS Towards frequency adaptation for delayed feedback deep brain stimulations STN HFS
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Rubidium-beam microwave clock pumped by distributed feedback diode lasers 认领 引用 被引量：1
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作者 刘畅 周晟 +1 位作者 王延辉 侯士敏 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第11期151-154,共4页
A rubidium-beam microwave clock, optically pumped by a distributed feedback diode laser, is experimentally investigated. The clock is composed of a physical package, optical systems, and electric servo loops. The phys... A rubidium-beam microwave clock, optically pumped by a distributed feedback diode laser, is experimentally investigated. The clock is composed of a physical package, optical systems, and electric servo loops. The physical package realizes the microwave interrogation of a rubidium-atomic beam. The optical systems, equipped with two 780-nm distributed feedback laser diodes, yield light for pumping and detecting. The servo loops control the frequency of a local oscillator with respect to the microwave spectrum. With the experimental systems, the microwave spectrum, which has an amplitude of 4 n A and a line width of 700 Hz, is obtained. Preliminary tests show that the clock short-term frequency stability is 7 × 10^-11 at 1 s, and 3 × 10^-12 at 1000 s. These experimental results demonstrate the feasibility of the scheme for a manufactured clock. 展开更多
关键词 quantum frequency standard atomic clock atomic beam distributed feedback
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Toward exploring noncontinuous-state dynamics based on pulse-modulated frequency-shifted laser feedback interferometry 认领 引用 被引量：3
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作者 JIE LI YUNKUN ZHAO +5 位作者 JIE LIU JIANCHU LIU HONGTAO LI QI YU JIALIANG LV LIANG LU 《Photonics Research》 SCIE EI CAS CSCD 2025年第3期671-686,共16页
An exhaustive study of the noncontinuous-state laser dynamics associated with the transient optical process is significant because it reveals the complex physical mechanisms and characteristics in nonlinear laser syst... An exhaustive study of the noncontinuous-state laser dynamics associated with the transient optical process is significant because it reveals the complex physical mechanisms and characteristics in nonlinear laser systems.In this study,in-depth theoretical interpretation and experimental verification of the noncontinuous-state dynamics in laser system are presented,based on developed pulse-modulated frequency-shifted laser feedback interferometry(LFI).By introducing external pulse modulation,we investigate the nonlinear time-of-flight dynamics and related photon behaviors evolution of the pulsed LFI system by observing the changes in effective interference time sequences for interference realization and attainable minimum feedback photon number of the signal under various modulated noncontinuous states.Implementation of the pulse-modulated LFI scheme should exceed the pulse overlapping time window limit of 1.93μs to effectively extract and preserve the extracavity feedback photon information.Experiments reveal that the minimum feedback photon number of signals successfully measured by the pulsed LFI sensor is 0.067 feedback photons per Doppler cycle,exhibiting high sensitivity for extremely weak signal detection.Further,simultaneous measurement for velocity and distance of the moving object is performed to validate the feasibility and applicability of the pulsed LFI.The system can successfully achieve large-range simultaneous measurements within the velocity range of 73.5-612.6 mm∕s,over a distance of 25.5 km.This work opens the way to unexplored frontiers of pulsed LFI to fill the research gap in noncontinuous laser dynamics in this field,showcasing diverse and wide-ranging applications in the realm of integrated sensing,remote monitoring,and positioning and navigation. 展开更多
关键词 nonlinear time flight dynamics laser system pulse modulated frequency shifted laser feedback interferometry transient optical process sensitivity nonlinear laser systemsin noncontinuous state dynamics photon behavior evolution
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A waveguide overloaded cavity kicker for the HLS Ⅱlongitudinal feedback system 认领 引用
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作者 栗武斌 周泽然 +4 位作者 孙葆根 吴芳芳 徐卫 卢平 杨永良 《Chinese Physics C》 SCIE EI CAS CSCD 2014年第3期66-71,共6页
In the upgrade project of Hefei Light Source（HLSⅡ）,a new digital longitudinal bunch-by-bunch feedback system will be developed to suppress the coupled bunch instabilities in the storage ring effectively.We design a... In the upgrade project of Hefei Light Source（HLSⅡ）,a new digital longitudinal bunch-by-bunch feedback system will be developed to suppress the coupled bunch instabilities in the storage ring effectively.We design a new waveguide overloaded cavity longitudinal feedback kicker as the feedback actuator.The beam pipe of the kicker is a racetrack shape so as to avoid a transition part to the octagonal vacuum chamber.The central frequency and the bandwidth of the kicker have been simulated and optimized to achieve design goals by the HFSS code.A higher shunt impedance can be obtained by using a nose cone to reduce the feedback power requirement.Before the kicker cavity was installed in the storage ring,a variety of measurements were carried out to check its performance.All these results of simulation and measurement are presented. 展开更多
关键词 longitudinal feedback kicker waveguide loaded central frequency bandwidth shunt impedance HOMs
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A 2.5-V 56-mW baseband chain in a multistandard TV tuner for mobile and multimedia applications 认领 引用 被引量：1
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作者 杨洲 文光俊 冯筱 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2011年第3期94-99,共6页
This paper presents post-layout simulated results of an analog baseband chain for mobile and multimedia applications in a 0.13-μm SiGe BiCMOS process.A programmable 7th-order Chebyshev low pass filter with a calibrat... This paper presents post-layout simulated results of an analog baseband chain for mobile and multimedia applications in a 0.13-μm SiGe BiCMOS process.A programmable 7th-order Chebyshev low pass filter with a calibration circuit is used in the analog baseband chain,and the programmable bandwidth is 1.8/2.5/3/3.5/4 MHz with an attenuation of 26/62 dB at offsets of 1.25/4 MHz.The baseband programmable gain amplifier can achieve a linear 40-dB gain range with 0.5-dB steps.Design trade-offs are carefully considered in designing the baseband circuit,and an automatic calibration circuit is used to achieve the bandwidth accuracy of 2%.A DC offset cancellation loop is also introduced to remove the offset from the layout and self-mixing,and the remaining offset voltage is only 1.87 mV.Implemented in a 0.13-μm SiGe technology with a 0.6-mm2 die size,this baseband achieves IIP3 of 23.16 dBm and dissipates 22.4 mA under a 2.5-V supply. 展开更多
关键词 multimedia baseband low pass filter leapfrog programmable gain amplifier frequency calibration DC negative feedback loop
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