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8 Result(s)

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  1. No Access

    Article

    Joint sensing time and power allocation in cognitive networks with amplify-and-forward cooperation

    Cognitive radio is a novel approach to cope with spectrum scarcity, in which either a network or a wireless node changes its transmission or reception parameters to communicate efficiently. However, it is diff...

    Shunling Ruan, Chengshi Zhao, Song Jiang, Kyungsup Kwak in Annals of Telecommunications (2018)

  2. No Access

    Article

    A Bandwidth-Efficient Transmission Scheme Based on Spectrum Sensing Results in CR Networks

    A bandwidth-efficient transmission scheme based on conservative spectrum sensing results without a common reporting channel is proposed for cognitive radio (CR) networks. A secondary relay node can assist a se...

    Tai** Cui, Kyungsup Kwak in Wireless Personal Communications (2017)

  3. No Access

    Article

    Mutual interference considered power allocation in OFDM-based cognitive networks: the multiple SUs case

    Power allocation for secondary users (SUs) in cognitive networks is an important issue to ensure the SUs’ quality of service. When the mutual interference between the primary users (PUs) and the SUs is taken i...

    Chengshi Zhao, Mingrui Zou, Kyungsup Kwak in annals of telecommunications - annales des… (2010)

  4. No Access

    Article

    Comprehensive Capacity Ensured Distributed Binary Power Allocation in Dense Cognitive Networks

    Considering the capacity gain of the secondary system and the capacity loss of the primary system caused by the newly accessing user, a distributed binary power allocation (admittance criterion) is proposed in...

    Chengshi Zhao, Kyungsup Kwak in Journal of Network and Systems Management (2010)

  5. No Access

    Article

    Multiple Access M-ary Modulation UWB System Based on Code-Selected Direct Sequence Bipolar PAM

    This work presents an M-ary multiple access code-selected direct sequence (DS) ultra wideband (UWB) communication system. A high data rate multiple access UWB system can be obtained by a code selection mechanism....

    Zhiquan Bai, Dongfeng Yuan, Kyungsup Kwak in Wireless Personal Communications (2009)

  6. No Access

    Chapter and Conference Paper

    Improving Handoff Performance by Using Distance-Based Dynamic Hysteresis Value

    In this study, an adaptive handoff algorithm with a dynamic hysteresis value, based on the distance between the mobile station and the serving base station, is proposed for cellular communications. Handoff pro...

    Huamin Zhu, Kyungsup Kwak in Management of Convergence Networks and Services (2006)

  7. No Access

    Chapter and Conference Paper

    Performance Analysis of an Adaptive Soft Handoff Algorithm for Mobile Cellular Systems

    In this paper, an adaptive soft handoff algorithm, which dynamically calculates the threshold values for soft handoff based on the received signal strength, is proposed for mobile cellular communication system...

    Huamin Zhu, Kyungsup Kwak in Management of Convergence Networks and Services (2006)

  8. No Access

    Chapter and Conference Paper

    Performance Analysis of DS-BPAM UWB System over Fading Channels—Uncoded and Coded Schemes

    This paper investigates the performance of two direct sequence ultra wideband (DS-UWB) communication systems over multipath fading channels. The first system is the classic DS-UWB system and the second is obta...

    Zhiquan Bai, Shaoyi Xu, Weihua Zhang, Kyungsup Kwak in Embedded and Ubiquitous Computing (2006)