Estimating local mean signal power level in a Rayleigh fading environment

1999 ◽  
Vol 48 (3) ◽  
pp. 956-959 ◽  
Author(s):  
D. Wong ◽  
D.C. Cox
Keyword(s):  
Rayleigh Fading ◽  
Power Level ◽  
Signal Power ◽  
Local Mean

scholarly journals Shortest Link Scheduling in Wireless Networks Under The Rayleigh Fading Model

2021 ◽  
Author(s):  
Baogui Huang ◽  
Jiguo Yu ◽  
Chunmei Ma ◽  
Fengyin Li ◽  
Guangshun Li
Keyword(s):  
Wireless Networks ◽  
Rayleigh Fading ◽  
Scheduling Algorithm ◽  
Random Variable ◽  
Rayleigh Distribution ◽  
Interference Model ◽  
Link Scheduling ◽  
Signal Power ◽  
Schedule Delay ◽  
Radio Signals

Abstract Many shortest link scheduling algorithms adopt non-fading SINR interference model, which assumes that the received signal power will always remain determinate as long as the transmission power of the corresponding sender is fixed. In fact, because environment always influences the propagation of radio signals, the received signal power is by no means a certain value. Rayleigh fading is a statistical model for radio signals propagation. It assumes that the strength of a signal on a receiver is a random variable, varying with the Rayleigh distribution. This paper proposes a shortest link scheduling algorithm under the Rayleigh fading model (SLSRF). The SLSRF partitions the wireless network area into hexagons and colors the hexagons with 3 different colors such that two neighboring hexagons have different colors. The senders of the links scheduled simultaneously are arranged in hexagons with the same color. The correctness of the SLSRF is proved through theoretical analysis, and the efficiency is illustrated by elaborate simulations. Our simulation results demonstrate that the schedule delay of SLSRF is less than that of some results under the non-fading SINR interference model. Furthermore, we extend the SLSRF to a distributed version, which is suitable for large wireless networks.

Research on Channel Equipment Reliability Analysis Methods of Measurement and Control System of Ship-Borne

2013 ◽  
Vol 765-767 ◽  
pp. 2057-2060
Author(s):  
Si Fang Liu ◽  
Jiu Lin Guo ◽  
Jian Hong Xu ◽  
Hong Qiang Guo
Keyword(s):  
Control System ◽  
Power Level ◽  
Signal Power ◽  
Test Results ◽  
Mathematical Methods ◽  
Measurement And Control System ◽  
Equipment Reliability ◽  
And Control ◽  
Measurement And Control ◽  
Methods Of Measurement

Aiming at the feature of failure occurs frequently, check links, difficult to position for channel equipment of measurement and control system of the ship-borne, according as to equipment index that reflects equipment performance-signal power level, analyzes channel equipment reliability by different mathematical methods, and based on the previous equipment test results of data analysis, presents the method of wavelet neural network, to analyze equipment reliability and forecast malfunction .

scholarly journals Shortest link scheduling in wireless networks under the Rayleigh fading model

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Baogui Huang ◽  
Jiguo Yu ◽  
Chunmei Ma ◽  
Fengyin Li ◽  
Guangshun Li
Keyword(s):  
Wireless Networks ◽  
Rayleigh Fading ◽  
Scheduling Algorithm ◽  
Random Variable ◽  
Rayleigh Distribution ◽  
Interference Model ◽  
Link Scheduling ◽  
Signal Power ◽  
Schedule Delay ◽  
Radio Signals

AbstractMany shortest link scheduling algorithms adopt non-fading SINR interference model, which assumes that the received signal power will always remain determinate as long as the transmission power of the corresponding sender is fixed. In fact, because environment always influences the propagation of radio signals, the received signal power is by no means a certain value. Rayleigh fading is a statistical model for radio signals propagation. It assumes that the strength of a signal on a receiver is a random variable, varying with the Rayleigh distribution. This paper proposes a shortest link scheduling algorithm under the Rayleigh fading model (SLSRF). The SLSRF partitions the wireless network area into hexagons and colors the hexagons with three different colors such that two neighboring hexagons have different colors. The senders of the links scheduled simultaneously are arranged in hexagons with the same color. The correctness of the SLSRF is proved through theoretical analysis, and the efficiency is illustrated by elaborate simulations. Our simulation results demonstrate that the schedule delay of SLSRF is less than that of some results under the non-fading SINR interference model. Furthermore, we extend the SLSRF to a distributed version, which is suitable for large wireless networks.

Distributed Feedback Laser (DFB) for Signal Power Amplitude Level Improvement in Long Spectral Band

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Debabrata Samanta ◽  
M. Sivaram ◽  
Ahmed Nabih Zaki Rashed ◽  
C.S. Boopathi ◽  
IS Amiri ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Power Level ◽  
Spectral Band ◽  
Signal Amplitude ◽  
Bias Current ◽  
Distributed Feedback ◽  
Signal Power ◽  
Distributed Feedback Laser ◽  
Period Variations ◽  
Amplitude Level

AbstractThis study outlines the distributed feedback laser for signal power amplitude level improvement in the long spectral band of 1550 nm wavelength within supporting pumped wavelength of 1480 nm. The bias and modulation peak currents based distributed feedback laser are varied in order to test the signal power level, peak signal amplitude variations after the fiber-optic channel and light detectors. The signal power level, peak signal amplitude is measured against spectral wavelength and time bit period variations. The study emphasis the signal power level, peak signal amplitude are enhanced for the best selection values of both a bias current at 45 mA and modulation peak current at 0.5 mA.

scholarly journals Adaptive Data Length Method for GPS Signal Acquisition in Weak to Strong Fading Conditions

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1735
Author(s):  
Arif Hussain ◽  
Arslan Ahmed ◽  
Hina Magsi ◽  
Jahangeer Badar Soomro ◽  
Syed Sabir Hussain Bukhari ◽  
...  
Keyword(s):  
Power Level ◽  
Correlation Method ◽  
Threshold Level ◽  
Signal Acquisition ◽  
Indoor Environments ◽  
Navigation Systems ◽  
Signal Power ◽  
Shipping Industry ◽  
Acquisition Process ◽  
Data Length

Satellite-based navigation is an essential part of all the technology-dependent applications, such as road transport, cell phones, the medical field, aviation or the shipping industry, etc. The performance of the navigation systems depends upon how quickly they can acquire and process the received signals for positioning solutions. However, in dense urban or indoor environments, signal acquisition can be a challenging task due to fading as a result of multipath and/or interference. This paper presents post-processing acquisition results on Global Positioning System (GPS) signals to study the relationship between data lengths used for signal acquisition and the achieved signal power using a Fast Fourier Transform (FFT)-based circular correlation method. Based on this study, the detection performance of the FFT-based method has also been analyzed by intentionally degrading the signal power levels. A new Adaptive Data length (ADL) method for acquisition has been proposed in this paper, which can be used for speeding up the acquisition process and uses adaptive data lengths rather than fixed data lengths. The ADL method works by estimating the threshold level based on the noise present in the signal and then comparing it with the signal power levels. Less difference between the threshold level and signal power level means less data length will be used while more difference means that more data length will be used for acquisition. The proposed algorithm can be used in commercially available receivers for adopting to an adaptive acquisition process for increased efficiency.

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