共查询到20条相似文献，搜索用时 171 毫秒
1.
滤波器在通信系统中可以让所需信号顺利通过,从而有效滤除不需要的频率信号。利用微带线高阻抗线近似等效于一串联电感,低阻抗线近似等效于一并联电容,把相应的高阻抗线和低阻抗线相互级联起来,这就构成了微带低通滤波器,其具有结构简单,容易加工等优点。文章进行了理论计算,并用ADS进行了优化仿真,仿真结果显示其具有良好的频带响应特性。 相似文献
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文章给出了利用微波网络理论设计微带终端电容耦合带通滤波器的综合设计方法,并结合现在大量使用的电磁仿真软件强大的计算功能,极大地提高了设计效率和设计精度。文中给出了设计实例,仿真结果表明,所设计滤波器的性能与理论值一致,能够满足工程设计的需要。 相似文献
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文章给出了利用微波网络理论设计微带终端电容耦合带通滤波器的综合设计方法,并结合现在大量使用的电磁仿真软件强大的计算功能,极大地提高了设计效率和设计精度.文中给出了设计实例,仿真结果表明,所设计滤波器的性能与理论值一致,能够满足工程设计的需要. 相似文献
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本文主要设计了一款开关电容滤波器,并分析了该滤波器的原理,计算了其Q值、振荡频率.该系统通过单片机的串口资源与PC机进行通信,来配置滤波器. 相似文献
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使用传统的理论计算的方法设计滤波器过程较为繁琐,文章使用ADS软件快速设计微带型低通滤波器,并在HFSS中建模仿真,在实际工程应用中取得了良好的效果。 相似文献
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在射频频带日益拥挤的今天,人们为了提高通信质量,开始广泛的研究和应用L波段带通滤波器,使之在通讯领域得到广泛的应用。文章基于微带环形谐振腔,设计了工作于L波段的窄带带通滤波器,并对其进行了不断地优化和改进。最终得出L波段窄带通滤波器,有体积小指标好等特点,具有应用价值。 相似文献
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本文从耦合谐振电路的基本原理出发,推导了耦合谐振电路的S参数公式,给出了耦合谐振器的耦合系数.利用耦合谐振器的基本原理设计了由6个开槽方环组成的对称结构微带带通滤波器,在滤波器通带两侧分别有一个传输零点,使得滤波器具有很好的选择性.理论计算所得的频率响应和电磁仿真软件得到的结果非常吻合. 相似文献
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《科技通报》2016,(3)
小区域重叠干扰下的通信滤波器通信信号由于受到外界环境的干扰通常极不稳定,传统噪声抑制方法只适用于平稳信号,无法实现复杂环境下通信滤波器噪声的抑制,提出一种基于自适应非线性滤波的小区重叠干扰下通信滤波器噪声抑制算法,对小区重叠干扰下的通信信号进行预增强处理,对得到的通信信号和既定阈值进行比较,判断是否需要进行噪声抑制,为小区重叠干扰下的通信滤波器噪声抑制提供有效依据。假设小区重叠干扰喜爱通信滤波器接收信号是同步的,给出采样结果。对滤波器的估计方差和条件方差进行计算,求出背景噪声和干扰剩余之和的方差,通过自适应改变非线性变换的非线性部分的变化曲线,实现小区域重叠干扰下的通信滤波器噪声抑制。仿真实验结果表明,所提方法具有很高的噪声抑制性能。 相似文献
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This paper investigates the problem of event-triggered filter design for nonlinear networked control systems (NCSs) in the framework of interval type-2 (IT2) fuzzy systems. A novel IT2 fuzzy filter for ensuring asymptotic stability and H∞ performance of filtering error system is proposed, where the premise variables are different from those of the fuzzy model. Attention is focused on solving the problem of event-triggered filter design subject to parameter uncertainties, data quantization, and communication delay in a unified frame. It is shown that the proposed event-triggered filter design communication mechanism for IT2 fuzzy NCSs has the advantage of the existing event-triggered approaches to reduce the utilization of limited network resources and provides flexibility in balancing the tracking error and the utilization of network resources. Finally, simulation example is given to validate the advantages of the presented results. 相似文献
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单音干扰是WiMAX通信系统中的一种常见干扰,在基带处理前引入单音干扰算法能有效抑制单音干扰,提高系统性能。本文提出了一种基于Notch滤波器的抑制固定单音干扰算法及其FPGA逻辑实现方法。文中首先阐述了设计思想,然后讨论Notch滤波器原理及设计方法,最后给出该算法在FPGA中的实现及滤波效果评估。评估测试结果表明该算法不仅可以有效抑制WiMAX通信系统的单音干扰而且易于FPGA逻辑实现。 相似文献
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《Journal of The Franklin Institute》2022,359(13):7091-7114
This paper focuses on the extended dissipative filter design problem for a class of uncertain semi-Markov jump systems in the discrete-time context, where the parameter uncertainties are assumed to be occurred in a special probabilities way. The aim of this paper is to design a mode-dependent filter ensuring the stochastic stability of the resulting filtering error system. To reduce the burden of communication network, the event-triggered scheme and quantized measurement are employed. By constructing a new Lyapunov functional, the filter design methodology is put forward. Finally, two numerical examples are proposed to demonstrate the usefulness of the filter design methodology. 相似文献
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Huijiao Wang Anke Xue Junhong Wang Renquan Lu 《Journal of The Franklin Institute》2017,354(14):6170-6189
The problem of event-based H∞ filtering for discrete-time Markov jump system with network-induced delay is investigated in this paper. For different jumping modes, different event-triggered communication schemes are constructed to choose which output signals should be transmitted. Through the analysis of network-induced delay’s intervals, the discrete-time system, the event-triggered scheme and network-induced delay are unified into a discrete-time Markov jump filter error system with time-delay. Based on time-delay system analysis method, criteria are derived to guarantee the discrete-time Markov jump error system stochastically stable with an H∞ norm bound. The correspondent filter and the event-based parameters are also given. A numerical example is given to show that the proposed filter design techniques are effective and event-triggered communication scheme can save limited network resources greatly. 相似文献
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Yingchun Wang Longfei Zheng Huaguang Zhang Xiangpeng Xie 《Journal of The Franklin Institute》2018,355(17):8392-8411
This paper investigates the problem of event-triggered fault detection filter design for nonlinear networked control systems with both sensor faults and process faults. First, Takagi–Sugeno (T–S) fuzzy model is utilized to represent the nonlinear systems with faults and disturbances. Second, a discrete event-triggered communication scheme is proposed to reduce the utilization of limited network bandwidth between filter and original system. At the same time, considering network-induced delays and event-triggered scheme, a novel T–S fuzzy fault detection filter is constructed to generate a residual signal, which has nonsynchronous premise variables with the original T–S fuzzy system. Then, the fuzzy Lyapunov functional based approach and the reciprocally convex approach are developed such that the obtained sufficient conditions ensure that the fuzzy fault detection system is asymptotically stable with H∞ performance and is less conservative. All the conditions are given in terms of linear matrix inequalities (LMIs), which can be solved by LMI tools in MATLAB environment. Finally, a numerical example is provided to demonstrate the effectiveness of the proposed results. 相似文献
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深入分析了某智能网络分析仪数字中频处理中的有限脉冲响应（FIR）数字滤波器的设计原理。设计的FIR滤波器根据设计要求可以改变参数,使得滤波器性能达到最优化,能节省大量编程时间,提高编程效率。该滤波器通带波动小、阻带衰减大,从而证明其算法具有有效性和优越性,阐述了其具体的设计原理及实现方案。 相似文献
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This paper investigates an H2/H∞ filter designing for networked systems perturbed by multiple noises. The measurement transmission from the sensor to the remote filter is completed via a communication network in simultaneously presenting of data transmission time-varying delays, data packet dropout and data sequence disorder. Since the filter will receive delayed and disordered information, a zero-order-hold (ZOH) or a logical-ZOH (LZOH) is firstly employed for resorting the chaos data sequence. Afterwards, a hybrid H2/H∞ filtering scheme is designed for accurately estimating the target output. By Itô formula and a novel free-weight method, the almost surely mean square exponentially stable (ASMSES) condition of the error system is conveniently obtained and the corresponding filter design method is finally presented. By the proposed method, not only the ASMSES with a pre-scheduled H2/H∞ performance can be achieved, but also the convergence rate of overall system is pre-regulable. In addition, it has been point out the dynamic filtering performance of LZOH scheme should be better than ZOH ones due to less time-varying delays are introduced and more latest measurement information are employed. Numerical examples are provided to demonstrate the effectiveness of the proposed methods. 相似文献
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现代通信系统对滤波器的要求越来越严格,要求滤波器体积小、重量轻、制造成本低、性能好且稳定,而滤波器的谐波严重影响其性能。文章从滤波器多年的发展状况总结了几种谐波抑制方法,提出了一种利用三截面阶梯阻抗和过耦合技术结合的方法,使得阻带达到了5倍中心频率。 相似文献
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This paper is concerned with the network-based H∞ fuzzy filtering for non-linear systems with parameter uncertainties under a novel adaptive discrete event-triggered communication scheme (DETCS). Based on interval type-2 (IT2) Takagi–Sugeno (T–S) fuzzy model, the non-linear systems with parameter uncertainties are represented as a class of IT2 T–S fuzzy systems. In the design process, a novel adaptive DETCS is proposed to reduce the usage of system resources and adapt the variation of plant output, and a novel networked IT2 T–S fuzzy filter is applied to improve the flexibility of filter design. By employing the time-delay systems modeling method, the filtering-error-system is modeled as a class of interval time-varying delayed IT2 T–S fuzzy systems with asynchronously and imperfectly matched membership functions, and further conditionally expressed as a favorable form. Then, some relaxed stability criteria are established to determine that this class of delayed IT2 T–S fuzzy systems is asymptotically stable with a prescribed H∞ disturbance attenuation performance. Also, the co-design of parameter matrices of adaptive DETCS and filter is implemented. Finally, two numerical examples are provided to demonstrate the effectiveness of the proposed method. 相似文献
20.
《Journal of The Franklin Institute》2023,360(4):2751-2768
This article studies adaptive prescribed performance tracking control problem for a class of strict-feedback nonlinear systems with parametric uncertainties and actuator failures. Firstly, in order to compensate the multiple uncertainties and eliminate the influence of actuator failure, a new adaptive tracking controller based on first-order filter technology will be proposed, which simplifies the algorithm design process. Then, by introducing an asymmetric state transition function, the transient and steady performances of the output tracking error are both constrained such that the predetermined performance control goal is achieved. Moreover, to reduce the communication burden from the controller to the actuator, the event-triggered mechanism is designed, and there will be no Zeno phenomenon. Based on Lyapunov stability theory, it is strictly proved that output signal can track the reference signal and all the signals of the closed-loop system are bounded. Finally, a simulation example is performed and the results demonstrate effectiveness of the proposed strategy. 相似文献