Now showing items 52-71 of 95

    • A New Adaptive EDCA Approach to QoS of Wireless Communications 

      Wang, Huibin; Hu, Yang; Zhang, Lili; Xia, Wei (Scientific Research Publishing, 2010-07)
      Under the background of intelligent transportation application, QoS for various services is different in wireless com-munication. Based on the MAC layer protocol, this paper analyzes the QoS in IEEE 802.11 MAC protocol ...
    • A New Algorithm of Mobile Node Localization Based on RSSI 

      Zhang, Jie; Liu, Hongli; Huang, Bowei (Scientific Research Publishing, 2011-04)
      Position mobile node coordinate is a key component to determine the accuracy and efficiency of positioning in wireless sensor networks. Flexible location algorithm admits to adjust the accuracy and time cost of positioning ...
    • A Novel Ultra-Wideband Monopole Antenna with Band-Stop Characteristic 

      Lak, Hadi J.; Ghobadi, Changiz; Nourinia, Javad (Scientific Research Publishing, 2011-10)
      In this letter, a simple monopole antenna with variable band-notched characteristic for ultra wide band (UWB) function is proposed. Two L-shaped quarter-waveguide resonators coupled to the ground plane with two shorting ...
    • On the Design of Circular Fractal Antenna with U-Shape Slot in CPW-Feed 

      Kumar, Raj (Scientific Research Publishing, 2010-10)
      new ultawideband circular fractal antenna with notched-band characteristics is presented. A notched-band characteristic is achieved by employing a U-shape slot in 50 Ω feed lines. The ultra-wideband impedance matching and ...
    • Optimal M-BCJR Turbo Decoding: The Z-MAP Algorithm 

      Ouardi, Aissa; Djebbari, Ali; Bouazza, Boubakar S. (Scientific Research Publishing, 2011-10)
      In this paper, we propose a novel idea for improvement performances of the leader M-BCJR algorithm functioning in low complexity. The basic idea consists to localize error instant possibility, and then increase the complexity ...
    • Optimal Territorial Resources Placement for Multipurpose Wireless Services Using Genetic Algorithms 

      Cacciani, Daniele; Garzia, Fabio; Neri, Alessandro; Cusani, Roberto (Scientific Research Publishing, 2011-07)
      This paper presents a study for finding a solution to the placement of territorial resources for multipurpose wireless services considering also the restrictions imposed by the orography of the territory itself. To solve ...
    • Optimization of Impedance Plane Reducing Coupling between Antennas 

      Joe, Yong S.; Essiben, Jean-François D.; Hedin, Eric R.; Bisse, Jacquie T.; Mаtаngа, Jаcques (Scientific Research Publishing, 2011-01)
      This paper provides a solution for the design optimization of two-dimensional impedance structures for a given elec-tromagnetic field distribution. These structures must provide electromagnetic compatibility between antennas ...
    • Optimization of Threshold for Energy Based Spectrum Sensing Using Differential Evolution 

      Narayanan, K. Aravind; Shivaram, P. Arun; Maheshkumar, M.; Santhoshkumar, K.; Kumar, L. Sathiesh; Kumar, L. Sathiesh; Narayanankutty, K.A (Scientific Research Publishing, 2011-07)
      Interference threshold based on energy setting in cognitive radios is a non-convex optimization problem [4]. The convergence of optimization techniques like Genetic algorithm (GA) takes several iterations to fix this ...
    • P2P Model Based on Isolated Broadcast Domains 

      Li, Jianchun; Guo, Gongbing; Li, Jianyong; Huang, Daoying (Scientific Research Publishing, 2012-04)
      Resource location is the most important issue for Peer-to-Peer (P2P) system and flooding is the fundamental mechanism for unstructured P2P systems. Redundant messages will exponential growth with flooding scope increasing ...
    • The Performance Gain of Cognitive Radio in Adaptive Modulation Scheme 

      Foukalas, Fotis (Scientific Research Publishing, 2010-07)
      Cognitive radio is considered as one of the main enablers for provisioning dynamic and flexible spectrum/channel allocation in wireless communications. The reliable data transmission over cognitive radio should employ ...
    • Performance of Double-Pole Four-Throw Double-Gate RF CMOS Switch in 45-nm Technology 

      Srivastava, Viranjay M. (Scientific Research Publishing, 2010-10)
      In this paper, we have investigated the design parameters of RF CMOS switch, which will be used for the wireless tele-communication systems. A double-pole four-throw double-gate radio-frequency complementary-metal-oxide-semicon- ...
    • Performance Study of Multi-Path in VANETs and Their Impact on Routing Protocols 

      Wu, Jing; Wang, Yuhao (Scientific Research Publishing, 2011-07)
      Modeling complicated vehicular traffic behavior and analyzing effects on the communication performance of routing protocols taken by environmental factors have been a challenging task for the past several years. In this ...
    • Performance Tradeoff with Routing Protocols for Radio Models in Wireless Sensor Networks 

      Bala, Manju; Awasthi, Lalit (Scientific Research Publishing, 2011-04)
      In this paper, we have simulated and evaluated the performance tradeoff with routing protocols: Constrained Flooding, the Real-Time Search and the Adaptive Tree on MICA and MICAz platform with different radio models using ...
    • A Perspective on Traffic Measurement Tools in Wireless Networks 

      Siddamallaiah, Ramesh B.; Subramanian, Gowrishankar; Satyanarayana, Piriyapatna S. (Scientific Research Publishing, 2010-07)
      To understand the characteristics of the wireless networks, the network usage data from wireless measurement tools are essential. The data collection is a process of collecting the network time-varying information in ...
    • The Possibility of Using RFID System to Automate and Integrate the Attendance of Professors and Students in the Classroom 

      Meghdadi, Majid; Azar, Ahad A. (Scientific Research Publishing, 2016-11)
      One of the most important goals followed in most systems is to increase efficiency, reduce errors and enhance ease of data entry tasks such as better services in organizations. Therefore, the use of intelligent tools is ...
    • Power Efficient Scheduled-Based Medium Access Control Protocol over Wireless Sensor Networks 

      Khan, Muhammad S.; Alajlan, Abrar; Almasri, Marwah (Scientific Research Publishing, 2016-02)
      The flexible use of sensors has made them an attractive device to be deployed in almost every field of life such as health, military and home. Recent advancement in electronics and wireless communications has witnessed the ...
    • Practical Approaches to Securing an IT Environment 

      John C, Fuller; Cofie, Penrose; Warsame H, Ali; Emmanuel S., Kolawole (Communication and Network, 2017-11)
      There are a number of IT Security journals available in the literature but none of these research papers have practically specified approaches to secure the IT environment at large. In this paper, more emphases will be ...
    • Processor for Measuring Radio Network Design Quality 

      Gomez-Pulido, Juan A.; Mendes, Silvio P.; Vega-Rodriguez, Miguel A.; Cordeiro, Paulo J.; Sanchez-Perez, Juan M. (Scientific Research Publishing, 2011-07)
      In this paper we present the design and prototyping of an arithmetic processor based on reconfigurable technology, whose purpose is to determine in a parallel manner the quality of the solution in a radio network design ...
    • Prospects for Mobile Health in Pakistan and Other Developing Countries 

      Burney, Aqil; Abbas, Zain; Mahmood, Nadeem; Arifeen, Qamar-ul (Scientific Research Publishing, 2013-05)
      akistan is a developing country with more than half of its population located in rural areas. These areas neither have sufficient health care facilities nor a strong infrastructure that can address the health needs of the ...
    • Rain Attenuation at Terahertz 

      Ishii, S. (Scientific Research Publishing, 2010-10)
      Rain attenuation values were calculated using empirical raindrop-size distributions, which were, Marshall-Palmer (M-P), Best, Polyakova-Shifrin (P-S) and Weibull raindrop-size distributions, and also calculated using a ...