Impulse noise and large scale single frequency noise mitigation for underwater acoustic OFDM

2014 ◽  
Author(s):  
Lin Na ◽  
Haixin Sun ◽  
Xiaoyan Kuai ◽  
Cheng Ken ◽  
Qi Jie
Keyword(s):  
Large Scale ◽  
Impulse Noise ◽  
Single Frequency ◽  
Frequency Noise ◽  
Noise Mitigation ◽  
Underwater Acoustic

Decentralized H ∞ control for damping power system oscillations

2012 ◽  
Vol 2 (1) ◽  
Author(s):  
Guo-Jie Li ◽  
Tek Lie
Keyword(s):  
Power Systems ◽  
Power System ◽  
Large Scale ◽  
Digital Simulation ◽  
Design Procedure ◽  
Disturbance Attenuation ◽  
System Stability ◽  
Frequency Noise ◽  
Stability Robustness ◽  
Norm Bound

AbstractInter-area oscillations are serious problems to large-scale power systems. A decentralized H ∞ generator excitation controller of a power system is proposed to damp the inter-area oscillations and to enhance power system stability. The design procedure for a linear composite system is presented in terms of positive semi-definite solutions to modified algebraic inequalities. The resulting controller guarantees closed-loop stability, robustness and an H ∞-norm bound on disturbance attenuation even under uncertainties such as high frequency noise. The control is decentralized in the sense that the control of each generator depends on local information only. The effectiveness of the H ∞ controller is demonstrated through digital simulation studies on a two-machine power system.

Impulse Noise Mitigation for OFDM by Time-Frequency Spreading

2013 ◽  
pp. 8-20 ◽  
Author(s):  
Jiri Blumenstein ◽  
Roman Marsalek ◽  
Ales Prokes ◽  
Christoph Mecklenbräuker
Keyword(s):  
Impulse Noise ◽  
Noise Mitigation ◽  
Time Frequency

scholarly journals A Novel Dual-Band Conformal Surface Plasmons Waveguide With Tunable Frequency Response In Large-scale

2021 ◽  
Author(s):  
Yijiao Fang ◽  
Jiangwei Zhong
Keyword(s):  
Surface Plasmons ◽  
Fundamental Mode ◽  
Large Scale ◽  
Dual Band ◽  
Single Frequency ◽  
Dual Frequency ◽  
Microwave Frequencies ◽  
Frequency Tunability ◽  
Tunable Frequency ◽  
Almost All

Abstract A novel dual-band conformal surface plasmons (CSPs) waveguide is designed and well studied in this paper. In earlier researches, we have recognized that electromagnetic field of CSPs waveguide are always confined to a sub-wavelength area and have a strong potential to be applied in devices designing. However, almost all of the earlier CSP structures is mainly focus on the fundamental mode characteristics with only single resonance frequency. Here we propose a innovative dual inverted-L structure with excellent performance not only on the fundamental mode but also on a new upper mode. This structure operates in microwave frequencies regime and shows outstanding frequency tunability characteristic. Being different from frequency characteristics in the earlier CSP waveguides which always used to be designed single-frequency device, dual-frequency tunability can be obtained via the dual L-type bending branch of the periodical CSP structure. In present paper, we also realize a tunable dual-frequency filter by changing the scaling factor of inverted-L stubs.

Influences of the Noise of Woodworking Wide Belt Sander on Human’s Psychological Load

2010 ◽  
Vol 29-32 ◽  
pp. 2008-2012
Author(s):  
Qiu Yun Mo ◽  
Hao Li
Keyword(s):  
Heart Rate ◽  
Human Body ◽  
Noise Level ◽  
The Other ◽  
Single Frequency ◽  
Frequency Noise

The acousic comfort of woodworking wide belt sander has been evaluation by impacts of on-the-spot noise and the main single frequency noise of woodworking machine-sander on workers’ physiological and psychological load from the aspect of the noise influencing heart rate．Experimental noises are abstracted from the noise of the woodworking sander under the usual processing, as the noise source．The heart rate experiments are done under two states, namely the noise and the quiet in the laboratory．Finally, the change of human load is analyzed on the basis of the heart rate．The method of heart rate instead of traditional noise level puts more emphasis on the workers’ psychological load than traditional methods．The noise influence on human body is discussed from the aspects of both psychology and physiology. The results show that the influence of the 67 Hz noise on human body’s load is the greater than the other noises in the noise-exposed period and that of the 1422 Hz noise is the greatest and most difficult to recover in the experimental recovery course.

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