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FSK信号的移相检测
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作者 竺南直 张其善 《电信科学》 北大核心 1990年第2期29-33,共5页
本文分析讨论了FSK信号的一种新的解调方式——移相检测的原理和性能。所得结果表明,这种解调方式的误码性能和2DPSK信号差分相干解调的误码性能相一致。最后重点讨论了频/相变换电路及其对误码性能的影响。实验结果表明,本解调方案是... 本文分析讨论了FSK信号的一种新的解调方式——移相检测的原理和性能。所得结果表明,这种解调方式的误码性能和2DPSK信号差分相干解调的误码性能相一致。最后重点讨论了频/相变换电路及其对误码性能的影响。实验结果表明,本解调方案是切实可行的。 展开更多
关键词 FSK 信号 移相检测
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FSK信号移相检测的原理和性能
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作者 竺南直 刘国梁 《遥测遥控》 1989年第4期35-41,59,共8页
本文首先介绍FSK信号移相检测的基本原理,然后推导它在白噪声条件下的误码特性。所得结果妻明,FSK信号移相检测的误码性能和2DPSK的误码性能相同,并且用实验证实了本解调制式是切实可行的。
关键词 FSK信号 移相检测 解调式
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移相电能质量检测法的研究 被引量:1
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作者 吕干云 程浩忠 +1 位作者 汪晓东 张浩然 《继电器》 CSCD 北大核心 2006年第3期60-62,70,共4页
电能质量检测是电能质量研究的一个重要组成部分,该文提出了一种移相电能质量检测方法。该检测方法原理简单、实时性好,可对电力系统最重要的几种电能质量扰动,包括谐波、电压凹陷、电压凸起、电压波动和暂态振荡,进行检测,且方法本身... 电能质量检测是电能质量研究的一个重要组成部分,该文提出了一种移相电能质量检测方法。该检测方法原理简单、实时性好,可对电力系统最重要的几种电能质量扰动,包括谐波、电压凹陷、电压凸起、电压波动和暂态振荡,进行检测,且方法本身没有延时,可应用于电能质量实时检测和识别系统中。该文运用大量的仿真数据和某牵引变母线电压现场采样数据对检测有效性进行了验证。 展开更多
关键词 电能质量 电能质量检测 仿真
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光伏并网系统主动移相式孤岛检测算法的改进 被引量:7
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作者 陈跃 郑寿森 +1 位作者 祁新梅 王飞 《系统仿真学报》 CAS CSCD 北大核心 2013年第4期748-752,共5页
从孤岛检测速度和并网电能质量的角度出发,分析了光伏并网发电系统中常见的主动移相式孤岛检测算法的特点,并针对DSP的应用环境提出了一种改进算法。仿真结果表明,该算法在保持算法的简单和孤岛检测快速的同时,能够降低并网电流和电网... 从孤岛检测速度和并网电能质量的角度出发,分析了光伏并网发电系统中常见的主动移相式孤岛检测算法的特点,并针对DSP的应用环境提出了一种改进算法。仿真结果表明,该算法在保持算法的简单和孤岛检测快速的同时,能够降低并网电流和电网电压之间的相位差,相对的提高了并网系统的电能质量,具有实际应用价值。 展开更多
关键词 光伏并网 孤岛检测 主动式孤岛检测算法 仿真
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衍射光栅移相定位检测方法研究
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作者 王鹤 时轮 王池平 《机电一体化》 2018年第9期9-16,共8页
在光栅干涉仪传统的定位检测技术的基础上,通过在检测视场中的两条纹之间加入光电传感器的移相运动,改变了信号的接收相位,从而提高光栅干涉仪定位检测技术的定位精度。基于该方法搭建了试验平台并分别进行了PI精密位移台基于传统的光... 在光栅干涉仪传统的定位检测技术的基础上,通过在检测视场中的两条纹之间加入光电传感器的移相运动,改变了信号的接收相位,从而提高光栅干涉仪定位检测技术的定位精度。基于该方法搭建了试验平台并分别进行了PI精密位移台基于传统的光栅检测定位试验和移相检测定位试验。试验结果表明,所提出的超精密定位检测方法能够显著提高PI精密位移台自身的定位精度,并且相较于传统的光栅检测定位方法,其定位精度能够提高70%以上。 展开更多
关键词 超精密检测 光栅衍射 移相检测 光栅干涉 测量
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A new detector in EBPSK communication system
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作者 靳一 吴乐南 +1 位作者 王继武 余静 《Journal of Southeast University(English Edition)》 EI CAS 2011年第3期244-247,共4页
In order to raise the detection precision of the extended binary phase shift keying (EBPSK) receiver, a detector based on the improved particle swarm optimization algorithm (IMPSO) and the BP neural network is des... In order to raise the detection precision of the extended binary phase shift keying (EBPSK) receiver, a detector based on the improved particle swarm optimization algorithm (IMPSO) and the BP neural network is designed. First, the characteristics of EBPSK modulated signals and the special filtering mechanism of the impacting filter are demonstrated. Secondly, an improved particle swarm optimization algorithm based on the logistic chaos disturbance operator and the Cauchy mutation operator is proposed, and the EBPSK detector is designed by utilizing the IMPSO-BP neural network. Finally, the simulation of the EBPSK detector based on the MPSO-BP neural network is conducted and the result is compared with that of the adaptive threshold-based decision, the BP neural network, and the PSO-BP detector, respectively. Simulation results show that the detection performance of the EBPSK detector based on the IMPSO-BP neural network is better than those of the other three detectors. 展开更多
关键词 extended binary phase shift keying DETECTOR impacting filter logistic chaos disturbance Cauchy mutation adaptive threshold-based decision
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Multiple phase detector of M-ary phase shift keying symbols in code division multiple access systems 被引量:1
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作者 QUAN Zhi 《Journal of Central South University》 SCIE EI CAS 2011年第4期1080-1086,共7页
A novel iterative technique, the phase descent search detection was proposed. This technique constrained the solution (PDS) algorithm, for M-ary phase shift keying (M-PSK) symbols to have a unit magnitude and it w... A novel iterative technique, the phase descent search detection was proposed. This technique constrained the solution (PDS) algorithm, for M-ary phase shift keying (M-PSK) symbols to have a unit magnitude and it was based on coordinate descent iterations where coordinates were the unknown symbol phases. The PDS algorithm, together with a descent local search (also implemented as a version of the PDS algorithm), was used multiple times with different initializations in a proposed multiple phase detector; the solution with the minimum cost was then chosen as the final solution. The simulation results show that for highly loaded multiuser scenarios, the proposed technique has a detection performance that is close to the single-user bound. The results also show that the multiple phase detector allows detection in highly overloaded scenarios and it exhibits near-far resistance. In particular, the detector has a performance that is significantly better, and complexity that is significantly lower, than that of the detector based on semi-definite relaxation. 展开更多
关键词 coordinate descent COMPLEXITY M-ary phase shift keying (M-PSK) multiuser detection quadratic optimization semi-definite relaxation
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BLIND ADAPTIVE MULTIUSER DETECTOR FOR NONLINEARLY MODULATED SATELLITE MOBILE CDMA SYSTEMS 被引量:2
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作者 Shao Shixiang Yang Longxiang Kyungsup Kwak 《Journal of Electronics(China)》 2006年第3期338-340,共3页
This paper presents a novel blind adaptive noncoherent decorrelative multiuser detector for nonlinearly modulated satellite mobile Code Division Multiple Access (CDMA) systems. By using the known signature waveforms o... This paper presents a novel blind adaptive noncoherent decorrelative multiuser detector for nonlinearly modulated satellite mobile Code Division Multiple Access (CDMA) systems. By using the known signature waveforms of the counterpart earth station in the blind adaptive multiuser detector, the system performance has been improved obviously. The computation results about the convergence properties of the new detector and the previous detectors demonstrate that the proposed multiuser detector has better performance than previous multiuser detectors for nonlinearly modulated CDMA systems. 展开更多
关键词 Mobile satellite communication Nonlinear Code Division Multiple Access (CDMA) system Noncoherent detection Multiuser detection
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Further Considerations of 100Gbit/s Wavelength Division Multiplexing System Commercial Application
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作者 沈世奎 王光全 +1 位作者 王海军 满祥锟 《China Communications》 SCIE CSCD 2013年第4期1-6,共6页
Along with the emergence and ma- turity of 100Gbit/s technologies, numbers of trial and commercial 100Gbit/s Wavelength Division Multiplexing (WDM) systems have been established worldwide. The research- oriented lab... Along with the emergence and ma- turity of 100Gbit/s technologies, numbers of trial and commercial 100Gbit/s Wavelength Division Multiplexing (WDM) systems have been established worldwide. The research- oriented lab tests of 100Gbit/s WDM systems were done by China Unicorn in 2012. The 100Gbit/s technologies of polarization multi- plex-quadrature phase shift keying with co- herent detection from multiple vendors have been studied. There are some further issues to be specified before the commercial application of 100Gbit/s WDM system is implemented in large scale in backbone network, including optical pertbnnance parameters, optical per- lbrmance monitoring of 100Gbit/s system, protection mechanism, selection of client in- terfhce and comprehensive Operation, Ad- ministration and Maintenance (OAM). 展开更多
关键词 100Gbit/s WDM system opticalperformance monitoring client interface pro-tection mechanism comprehensive OAM
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Detections of the Atomic States via the Phase Shifts of Transmitted Photons Through a Cavity
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作者 黄劲松 李艳玲 韦联福 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第11期601-606,共6页
We propose an approach to detect an unknown quantum state of the atom(s) by measuring the phase shifts of the transmitted photons through a dispersively-coupled cavity. In the framework of the input-output theory, we ... We propose an approach to detect an unknown quantum state of the atom(s) by measuring the phase shifts of the transmitted photons through a dispersively-coupled cavity. In the framework of the input-output theory, we derive the relations between the phase shifts of the transmitted photons and the states of the atom(s) in the cavity. It is shown that due to the dispersive interaction between the cavity and the atom(s), information about the atomic state can then be extracted by measuring the phase shifts of the transmitted photons through the cavity. The feasibility of the proposal is also discussed with the experimental parameters by numerical method. 展开更多
关键词 phase shift measurement cavity quantum electrodynamics
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