11 Result(s)
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Article
Kyungsup Kwak
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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...
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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...
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Article
Open AccessA power efficient MAC protocol for wireless body area networks
Applications of wearable and implanted wireless sensor devices are hot research area. A specialized field called the body area networks (BAN) has emerged to support this area. Managing and controlling such a n...
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Open AccessSecurity and Privacy Issues in Wireless Sensor Networks for Healthcare Applications
The use of wireless sensor networks (WSN) in healthcare applications is growing in a fast pace. Numerous applications such as heart rate monitor, blood pressure monitor and endoscopic capsule are already in us...
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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...
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Article
Fair exchange signature schemes
In this paper a new class of fair exchange signature scheme (FESS) is proposed that allows two players to exchange digital signatures in a fair way. The new signature scheme is a general model and has various ...
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Article
Open AccessEvaluation of Implant Communication with Polarisation and Unslotted CSMA/CA Protocol in Wireless Body Area Networks
The performance of the implant inside a human body with polarisation, distance, and different power settings at the base-station is presented. In addition, the unslotted CSMA/CA protocol is studied for a heter...
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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...
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Article
Open AccessA TR-UWB Downconversion Autocorrelation Receiver for Wireless Body Area Network
Low power UWB receiver architecture is proposed for a Wireless Body Area Network (WBAN). This receiving technology is a synergy of existing downconversion-based narrowband rejection mechanism in RF front end a...
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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....
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Article
Blind adaptive multiuser detector for nonlinearly modulated satellite mobile CDMA systems
This paper presents a novel blind adaptive noncoherent decorrelative multiuser detector for nonlinearly modulated satellite mobile Code Division Multiple Access (CDMA) systems. By using the known signature wav...
