Simultaneous Power Fluctuation and Average Power Minimization during Nano-CMOS Behavioral Synthesis

2007 ◽  
Author(s):  
Saraju P. Mohanty ◽  
Elias Kougianos
Keyword(s):  
Average Power ◽  
Power Minimization ◽  
Power Fluctuation ◽  
Behavioral Synthesis

scholarly journals Cooperative Spectrum Sensing Algorithm to Overcome Noise Fluctuations Based on Energy Detection in Sensing Systems

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Guicai Yu ◽  
Han Wang ◽  
Wencai Du
Keyword(s):  
Spectrum Sensing ◽  
Cooperative Spectrum Sensing ◽  
Signal To Noise Ratio ◽  
Average Power ◽  
Energy Detection ◽  
Detection Algorithm ◽  
Detection Sensitivity ◽  
Power Fluctuation ◽  
Sensing Systems ◽  
Noisy Signals

In sensing systems, nodes must be able to rapidly detect whether a signal from a primary transmitter is present in a certain spectrum. However, traditional energy-detection algorithms are poorly adapted to treating noisy signals. In this paper, we investigate how rapid energy detection and detection sensitivity are related to detection duration and average power fluctuation in noise. The results indicate that detection performance and detection sensitivity decrease quickly with increasing average power fluctuation in noise and are worse in situations with low signal-to-noise ratio. First, we present a dynamic threshold algorithm based on energy detection to suppress the influence of noise fluctuation and improve the sensing sensitivity. Then, we present a new energy-detection algorithm based on cooperation between nodes. Simulations show that the proposed scheme improves the resistance to average power fluctuation in noise for short detection timescales and provides sensitive detection that improves with increasing numbers of cooperative detectors. In other words, the proposed scheme enhances the ability to overcome noise and improves spectrum sensing performance.

scholarly journals Photonic crystal rod-based high-performance ultrafast fiber laser system

2020 ◽  
Vol 8 ◽  
Author(s):  
Zhiguo Lv ◽  
Zhi Yang ◽  
Qianglong Li ◽  
Feng Li ◽  
Yishan Wang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
High Performance ◽  
Beam Quality ◽  
Laser System ◽  
Average Power ◽  
Power Fluctuation ◽  
Transmission Grating ◽  
Chirped Pulse Amplification ◽  
Fundamental Research ◽  
Application Potential

Abstract In this paper, we innovatively conduct a Porro prism-based beam pointing stability promotion technique research and realize a high-performance rod-type photonic crystal fiber-based chirped pulse amplification (CPA) system, mainly including a frequency-reduced all-fiber pre-amplification stage, photonic crystal rod-based main amplification stage, and 1600 lines/mm transmission grating-pair compressor. Laser output with average power of 50 W, repetition rates of 500 kHz, pulse energy of 100 μJ, pulse duration of 830 fs, beam quality of M2<1.3, power fluctuation of 0.55% root mean square, and beam pointing drift of 19 μrad/°C over 8 h is realized. The high-performance laser system has an enormous application potential in fundamental research and precision manufacturing fields.

Numerical Analysis on Hydraulic Power Take-Off for Wave Energy Converter and Power Smoothing Methods

2018 ◽  
Author(s):  
Yi-Hsiang Yu ◽  
Nathan Tom ◽  
Dale Jenne
Keyword(s):  
Wave Energy ◽  
Power Output ◽  
Control Method ◽  
Average Power ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Power Fluctuation ◽  
Electrical Grid ◽  
Smoothing Methods ◽  
Power Smoothing

One of the primary challenges for wave energy converter (WEC) systems is the fluctuating nature of wave resources, which require the WEC components to be designed to handle loads (i.e., torques, forces, and powers) that are many times greater than the average load. This approach requires a much greater power take-off (PTO) capacity than the average power output and indicates a higher cost for the PTO. Moreover, additional design requirements, such as battery storage, are needed, particularly for practical electrical grid connection, and can be a problem for sensitive equipment (e.g., radar, computing devices, and sensors). Therefore, it is essential to investigate potential methodologies to reduce the overall power fluctuation while trying to optimize the power output from WECs. In this study, a detailed hydraulic PTO model was developed and coupled with a time-domain hydrodynamics model (WEC-Sim) to evaluate the PTO efficiency for WECs and the trade-off between power output and fluctuation using different power smoothing methods, including energy storage, pressure relief mechanism, and a power-based setpoint control method. The study also revealed that the maximum power fluctuation for WECs can be significantly reduced by one order of magnitude when these power smoothing methods are applied.

Average Power Minimization for Downlink NOMA Transmission with Partial HARQ

2018 ◽  
Author(s):  
Yanqing Xu ◽  
Donghong Cai ◽  
Zhiguo Ding ◽  
Chao Shen ◽  
Gang Zhu
Keyword(s):  
Average Power ◽  
Power Minimization
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