• A 300 GHz "Always-in-Focus" Focusing System for Target Detection 

  Montero-de-Paz, Javier; Enrique Garcia-Munoz, Luis; Segovia-Vargas, Daniel (Společnost pro radioelektronické inženýrství, 2013-06)

  A focusing system for a 300 GHz radar with 5 m target distance and 10 mm diameter spot size resolution is proposed. The focusing system is based on a Gaussian telescope scheme and its main parameters have been de¬signed ...

• Analyses of 100 Gbps Coherent System Performances 

  Skoda, Pavel; Radil, Jan; Vojtech, Josef; Hula, Miloslav (Společnost pro radioelektronické inženýrství, 2013-06)

  This paper presents the results of laboratory and field testing of coherent 100 Gbps system with DP-QPSK modulation. Several measurements were performed including power budget, nonlinear threshold, spectrum filtration, ...

• A BIC Based Initial Training Set Selection Algorithm for Active Learning and Its Application in Audio Detection 

  Leng, Yan; Qi, Guang-hui; Xu, Xin-yan (Společnost pro radioelektronické inženýrství, 2013-06)

  To construct a classification system or a detection system, large amounts of labeled samples are needed. However, manual labeling is dull and time consuming, so researchers have proposed the active learning technology. The ...

• Design of Dual-band Branch-Line Coupler Based on Shunt Open-Circuit DCRLH Cells 

  Lu, Ke; Wang, Guang-ming; Tian, Bo (Společnost pro radioelektronické inženýrství, 2013-06)

  In this article, the shunt open-circuit dual composite right/left-handed (DCRLH) cell is initially proposed and one dual-band branch-line coupler based on the proposed cells is designed. It is found that, compared with ...

• Contrast Enhancement in Poor Visibility Conditions Using Guided Filtering 

  Chowdhry, Danish Ali; Siddiqui, Adil Masood; Touqir, Imran (Společnost pro radioelektronické inženýrství, 2013-06)

  In this paper, extraction of atmospheric veil is proposed to enhance the contrast of the images captured under poor visibility conditions. The method based on guided filtering can accurately recover hidden edges, maintain ...

• A Comparison of the Machine Learning Algorithm for Evaporation Duct Estimation 

  Yang, Chao (Společnost pro radioelektronické inženýrství, 2013-06)

  In this research, a comparison of the relevance vector machine (RVM), least square support vector machine (LSSVM) and the radial basis function neural network (RBFNN) for evaporation duct estimation are presented. The ...

• Diamond Based DDR IMPATTs: Prospects and Potentiality as Millimeter-Wave Source at 94 GHz Atmospheric Window 

  Acharyya, Aritra; Datta, Koyel; Ghosh, Raya; Sarkar, Monalisa; Sanyal, Roshmy; Banerjee, Suranjana; Banerjee, J. P. (Společnost pro radioelektronické inženýrství, 2013-06)

  Large-signal simulation is carried out in this paper to investigate the prospects and potentiality of Double-Drift Region (DDR) Impact Avalanche Transit Time (IMPATT) device based on semiconducting type-IIb diamond as ...

• A Study of Differences in Calculated Capacity when Using Single-, Mixed- or Multiple-Bounce GSCM Schemes 

  Zentner, Radovan; Katalinic Mucalo, Ana; Nad, Robert (Společnost pro radioelektronické inženýrství, 2013-06)

  The paper looks for differences in MIMO system capacity when using either single-, mixed-, or multiple-bounce geometry based stochastic channel models (GSCMs). The investigation considers Saleh-Valenzuela temporal indoor ...

• Innovative Method of the Power Analysis 

  Martinasek, Zdenek; Zeman, Vaclav (Společnost pro radioelektronické inženýrství, 2013-06)

  This paper describes an innovative method of the power analysis which presents the typical example of successful attacks against trusted cryptographic devices such as RFID (Radio-Frequency IDentifications) and contact smart ...

• Analysis of ITU-R Performance and Characterization of Ku Band Satellite Downlink Signals during Rainy Season over Chennai Region of India 

  Suresh, Sanjeev; Madhan, M. Ganesh; Sivaraj, Maharaj; Parasuraman, S. (Společnost pro radioelektronické inženýrství, 2013-06)

  In this paper, we present the analysis of Ku band Satellite signal reception during rainy season over Chennai region, India (Latitude: 12° 56' 60 N, Longitude: 80° 7' 60 E). We also examine the effectiveness of International ...

• Simultaneous Perturbation Stochastic Approximation for Unambiguous Acquisition in Cosine-BOC Signals 

  Chen, Huihua; Ren, Jiawei; Jia, Weimin; Yao, Minli (Společnost pro radioelektronické inženýrství, 2013-06)

  The binary offset carrier (BOC) proposed for the global navigation satellite systems (GNSS) will enhance navigation performance and spectrum compatibility. However, the acquisition process is made more complex, due to the ...

• Beampattern Synthesis using Reweighted l1-Norm Minimization and Array Orientation Diversity 

  Chen, Hui; Wan, Qun; Fan, Rong (Společnost pro radioelektronické inženýrství, 2013-06)

  The pattern synthesis of sparse antenna arrays has many practical applications in situations where the weights, size, and cost of antennas are limited. In this work the antenna array synthesis problem, with minimum number ...

• Research on 2×2 MIMO Channel with Truncated Laplacian Azimuth Power Spectrum 

  Wu, Qing; Yang, Xue-Song; Zhang, Yi-Teng (Společnost pro radioelektronické inženýrství, 2013-06)

  Multiple-input multiple-output (MIMO) Rayleigh fading channel with truncated Laplacian azimuth power spectrum (APS) is studied. By using the power correlation matrix of MIMO channel model and the modified Jakes simulator, ...

• Compressed Sensing based Dynamic PSD Map Construction in Cognitive Radio Networks 

  Afshar Jahanshahi, Javad; Eslami, Mohammad; Ghorashi, Seyed Ali (Společnost pro radioelektronické inženýrství, 2013-06)

  In the context of spectrum sensing in cognitive radio networks, collaborative spectrum sensing has been proposed as a way to overcome multipath and shadowing, and hence increasing the reliability of the sensing. Due to the ...

• Energy Efficiency Analysis of a Two Dimensional Cooperative Wireless Sensor Network with Relay Selection 

  Kakitani, Marcos; Brante, Glauber; Souza, Richard (Společnost pro radioelektronické inženýrství, 2013-06)

  The energy efficiency of non-cooperative and cooperative transmissions are investigated in a two-dimensional wireless sensor network, considering a target outage probability and the same end-to-end throughput for all ...

• SPSA-Based Tracking Method for Single-Channel-Receiver Array 

  Zhang, Fenggan; Jia, Weimin; Yao, Minli; Zhou, Shuhua (Společnost pro radioelektronické inženýrství, 2013-06)

  A novel tracking method in the phased antenna array with a single-channel receiver for the moving signal source is presented in this paper. And the problems of the direction-of-arrival track and beamforming in the array ...

• The Impact of Sensing Range on Spatial-Temporal Opportunity 

  Zhang, Xian; Li, Xiaoqiang; Yun, Zi (Společnost pro radioelektronické inženýrství, 2013-06)

  In this paper, we study the impact of secondary user (SU) sensing range on spectrum access opportunity in cognitive radio networks. We first derive a closed-form ex- pression of spectrum access opportunity by taking into ...

• Online Malicious Behavior Detection in Collaborative Spectrum Sensing: A Change Detection Approach 

  Yao, Junnan; Wu, Qihui; Feng, Shuo; Wang, Jinlong (Společnost pro radioelektronické inženýrství, 2013-06)

  Intelligent attackers in collaborative spectrum sensing system could act as honest users to conceal themselves and start malicious behavior abruptly since an unpredictable time slot. Affected by honest behavior before ...

• An Ultra-Low-Power Oscillator with Temperature and Process Compensation for UHF RFID Transponder 

  Wang, Yao; Liu, Jiaxin; Xie, Liangbo; Wen, Guangjun (Společnost pro radioelektronické inženýrství, 2013-06)

  This paper presents a 1.28MHz ultra-low-power oscillator with temperature and process compensation. It is very suitable for clock generation circuits used in ultra-high-frequency (UHF) radio-frequency identification (RFID) ...

• A tunable Butterworth low-pass filter with digitally controlled DDCC 

  Hwang, Yuh-Shyan; Liu, An; Wang, San-Fu; Yang, Ssu-Che; Chen, Jiann-Jong (Společnost pro radioelektronické inženýrství, 2013-06)

  This paper presents a 6th-order tunable Butterworth low-pass active filter with Digitally Controlled Differential Difference Current Conveyor (DDCC). This active filter is synthesized using the systematic method of ...

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