نتایج جستجو برای: threshold detector
تعداد نتایج: 178905 فیلتر نتایج به سال:
Standard condition number (SCN) detector is a promising detector that can work efficiently in uncertain environments. In this paper, we consider a Cognitive Radio (CR) system with large number of antennas (eg. Massive MIMO) and we provide an accurate and simple closed form approximation for the SCN distribution using the generalized extreme value (GEV) distribution. The approximation framework ...
A wave detector, a newly designed magnetic probe, is installed in the large helical device (LHD). This wave detector is a 100-turn loop coil with electrostatic shield. Comparing a one-loop coil to this detector, this detector has roughly constant power coupling in the lower frequency range of 40 MHz, and it can easily detect magnetic wave in the frequency of a few megahertz. During high-harmoni...
This paper describes a refinement of an approach to locating objects in complex images with the objective of reducing the false alarm rate. The method uses genetic programming to evolve a detector using a threshold for defining an unclassified region. It is envisaged that incorporating a threshold during training will encourage programs to produce a high output when the object has been located....
This paper is devoted to research of the general and particular properties of the OFDM signal detector based on the cyclic autocorrelation function. The cyclic autocorrelation function is estimated using DFT. The parameters of the testing signal have been chosen according to 802.11g WLAN. Some properties are described analytically; all events are examined via computer simulations. It is shown t...
The implementation of the generalized detector (GD) in cognitive radio (CR) systems allows us to improve the spectrum sensing performance in comparison with employment of the conventional detectors. We analyze the spectrum sensing performance for the uncorrelated and spatially correlated receive antenna array elements. Additionally, we consider a practical case when the noise power at the outpu...
In this paper, we are evaluating the performances of energy detector receiver with on-off-keying (OOK) and pulse position modulation (PPM) in ultra wideband (UWB) communications. Energy detector (ED) receivers are considered as a lowcomplexity and low-power consumption option for the more complex coherent receivers. Obviously, the tradeoff for low complexity is degraded detection performance. A...
In image processing edge detection is an essential topic. We propose a new method for a simple edge detection and fast computation using fuzzy logic rule .We compare proposed edge detector to other existing edge detectors such as sobel edge detector, canny edge detector, and prewit edge detector. In addition it also deblurred the images efficiently and effectively. We present a new image deblur...
For an improved detection of cosmic ray muons with a threshold of 2.4 GeV, the KASCADE Central Detector has been upgraded with a new detector component built of limited streamer tubes. Combined with the operation of two layers of multiwire proportional chambers they enable studies of the muonic component of extensive air showers at higher particle densities. Due to the pad readout system of the...
In this paper, a new radar constant false alarm rate detector to perform adaptive threshold target detection in presence of interfering targets is proposed. The proposed CFAR detector, referred to as Adaptive Linear Combined CFAR, ALC-CFAR, employs an adaptive composite approach based on the well-known cell averaging CFAR, CA-CFAR, and the ordered statistics, OS-CFAR, detectors. Data in the ref...
Photomultiplier tubes and avalanche photodiodes, which are commonly used in quantum optic experiments, are sometimes referred to as threshold detectors because, in photon counting mode, they cannot discriminate the number of photoelectrons initially extracted from the absorber in the detector. We argue that they can be called threshold detectors on more account than that. We point out that thei...
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