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基于延时干扰的感应电能传输系统分岔频率输送控制 被引量:3
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作者 唐春森 孙跃 +3 位作者 戴欣 王智慧 苏玉刚 呼爱国 《物理学报》 SCIE EI CAS CSCD 北大核心 2013年第15期500-509,共10页
本文针对感应电能传输系统分岔频率的输送控制问题,提出一种基于延时干扰的变轨控制方法.该方法在反馈控制环节中加入一段延时干扰,通过调节延时参数,可使系统相轨迹流在各稳定极限环吸引子间自由切换.文中以原副边均为串联谐振的感应... 本文针对感应电能传输系统分岔频率的输送控制问题,提出一种基于延时干扰的变轨控制方法.该方法在反馈控制环节中加入一段延时干扰,通过调节延时参数,可使系统相轨迹流在各稳定极限环吸引子间自由切换.文中以原副边均为串联谐振的感应电能传输系统为例,对该方法的机理及实现方案进行了研究,并通过仿真和实验验证了其有效性.论文的研究结果对类似多吸引子分岔行为的输送控制可提供一定的理论参考. 展开更多
关键词 感应电能传输频率分岔输送控制延时干扰
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浅析幅频和时延特性对调频信号的影响
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作者 黄添杰 《内蒙古广播与电视技术》 1996年第2期26-31,共6页
浅析幅频和时延特性对调频信号的影响黄添杰(译)赵怀洁(校)(部影视设备厂100024)(厅科技情报室)前言调频波的传送必须保持良好的振幅频率特性(以下简称幅频特性)和延时频率特性(以下简称时延特性)。因此,天线共用器... 浅析幅频和时延特性对调频信号的影响黄添杰(译)赵怀洁(校)(部影视设备厂100024)(厅科技情报室)前言调频波的传送必须保持良好的振幅频率特性(以下简称幅频特性)和延时频率特性(以下简称时延特性)。因此,天线共用器和带通滤波器(BPF)等的通带应足... 展开更多
关键词 调频广播 调频信号 振幅频率 延时频率 广播
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浅析幅频和时延特性对调频信号的影响
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作者 黄添杰 《西部广播电视》 1996年第2期31-36,共6页
浅析幅频和时延特性对调频信号的影响黄添杰编译(广播电影电视部设备制造厂100024)1.前言调频波的传送必、须保持良好的振幅频率特性(以下简称幅频特性)和延时频率特性(以下简称时延特性)。因此,天线多工器和带通滤波器... 浅析幅频和时延特性对调频信号的影响黄添杰编译(广播电影电视部设备制造厂100024)1.前言调频波的传送必、须保持良好的振幅频率特性(以下简称幅频特性)和延时频率特性(以下简称时延特性)。因此,天线多工器和带通滤波器(BPF)等的通带应足够宽,而且使... 展开更多
关键词 调频广播 振幅频率 延时频率 调频信号
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The Jitter Performance Comparison Between DLL and PLL-Based RF CMOS Oscillators
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作者 李金城 仇玉林 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2001年第10期1246-1249,共4页
By jitter performance comparison between PLL (Phase Locked Loop) and DLL (Delay Locked Loop),a helpful equation is derived for the structure choice between DLL and PLL based synthesizers fabricated in CMOS processes ... By jitter performance comparison between PLL (Phase Locked Loop) and DLL (Delay Locked Loop),a helpful equation is derived for the structure choice between DLL and PLL based synthesizers fabricated in CMOS processes to get an optimum jitter performance and power consumption.For a frequency synthesizer,a large multiple factor prefers PLL based configuration which consumes less power,while a small one needs DLL based topology which produces a better jitter performance. 展开更多
关键词 JITTER PLL DLL frequency synthesizer RF CMOS transceiver Local Oscillator(LO) Voltage Controlled Delay Line(VCDL) VCO
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MDL-based root-mean-squared delay spread estimation for MIMO OFDM systems
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作者 徐晓东 井雅 尤肖虎 《Journal of Southeast University(English Edition)》 EI CAS 2004年第4期395-400,共6页
This paper studied the application of minimum description length (MDL) criterion for estimating root-mean-squared (RMS) delay spread (RDS) for MIMO OFDM systems. The analytic relationship between the powers and the co... This paper studied the application of minimum description length (MDL) criterion for estimating root-mean-squared (RMS) delay spread (RDS) for MIMO OFDM systems. The analytic relationship between the powers and the correlation matrix of multipath components established the feasibility of the application of the MDL criterion to RDS estimation. The estimator presented both the estimate of instantaneous RDS and the estimates of noise variance, channel power and SNR of current channel with low computational complexity. Given the powers of the estimated multipath components, the MDL criterion was adopted to acquire the number of paths and the time delays of each path of current channel without making eigendecomposition of the correlation matrix normally required by MDL criterion, following which the noise variance and the power of each path can be estimated. The power delay profile (PDP) and RDS of the current channel were achieved. Simulation results showed that the proposed estimator was insensitive to variance of SNR and robust against frequency-selectivity. 展开更多
关键词 Communication channels (information theory) Delay control systems Fading (radio) Robustness (control systems) Signal processing Wireless telecommunication systems
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Polynomial Root Finding on Frequency Estimation with Sub-Nyquist Temporal Sampling
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作者 石海杰 桂志国 张权 《Journal of Measurement Science and Instrumentation》 CAS 2011年第4期349-352,共4页
This paper addresses an algebraic approach for wideband frequency estimation with sub-Nyquist temporal sampling. Firstly, an algorithm based on double polynomial root finding procedure to estimate aliasing frequencies... This paper addresses an algebraic approach for wideband frequency estimation with sub-Nyquist temporal sampling. Firstly, an algorithm based on double polynomial root finding procedure to estimate aliasing frequencies and joint aliasing frequencies-time delay phases in multi-signal situation is presentcd. Since the sum of time delay phases determined from the least squares estimation shows the characteristics of the corre- sponding parameters pairs, then the pairmatching method is conducted by combining it with estimated parameters mentioned above. Although the proposed method is computationally simpler than the conventional schemes, simulation results show that it can approach optimum estimation performance. 展开更多
关键词 wideband frequency estimation sub-nyquist sampling polynomial root finding pair matching
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Spatial Dependent Spontaneous Emission of an Atom in a Semi-Infinite Waveguide of Rectangular Cross Section 被引量:1
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作者 Hai-Xi Song Xiao-Qi Sun +1 位作者 Jing Lu Lan Zhou 《Communications in Theoretical Physics》 SCIE CAS CSCD 2018年第1期59-67,共9页
We study a quantum electrodynamics(QED) system made of a two-level atom and a semi-infinite rectangular waveguide, which behaves as a perfect mirror in one end. The spatial dependence of the atomic spontaneous emissio... We study a quantum electrodynamics(QED) system made of a two-level atom and a semi-infinite rectangular waveguide, which behaves as a perfect mirror in one end. The spatial dependence of the atomic spontaneous emission has been included in the coupling strength relevant to the eigenmodes of the waveguide. The role of retardation is studied for the atomic transition frequency far away from the cutoff frequencies. The atom-mirror distance introduces different phases and retardation times into the dynamics of the atom interacting resonantly with the corresponding transverse modes. It is found that the upper state population decreases from its initial as long as the atom-mirror distance does not vanish, and is lowered and lowered when more and more transverse modes are resonant with the atom. The atomic spontaneous emission can be either suppressed or enhanced by adjusting the atomic location for short retardation time.There are partial revivals and collapses due to the photon reabsorbed and re-emitted by the atom for long retardation time. 展开更多
关键词 quantum optics WAVEGUIDE spontaneous emission RETARDATION
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