Zobrazeno 1 - 10
of 115
pro vyhledávání: '"Kyung-Geun Lee"'
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-11 (2023)
Abstract We propose a Fabry–Perot cavity (FPC) antenna to suppress a sidelobe level (SLL) while maintaining a reasonably high gain. Generally, conventional FPC antennas (FPCAs) produce a high SLL because waves in their FPC leak considerably through
Externí odkaz:
https://doaj.org/article/f5ddaa228e2c4dedae9a25a53af57c39
Publikováno v:
Applied Sciences, Vol 13, Iss 14, p 8222 (2023)
The proposed design approach improves the circularly polarized Fabry-Perot cavity antenna (CP-FPCA) by increasing gain and sidelobe suppression (SLS) while reducing the axial ratio (AR) and cross-polarization levels. Conventional CP-FPC antennas have
Externí odkaz:
https://doaj.org/article/8540fcc90ec1453eb6c62babab45f822
Publikováno v:
IEEE Access, Vol 5, Pp 283-294 (2017)
Wireless energy harvesting can improve the performance of cognitive wireless sensor networks (WSNs). This paper considers radio frequency (RF) energy harvesting from transmissions in the primary spectrum for cognitive WSNs. The overall success probab
Externí odkaz:
https://doaj.org/article/1e77a00805904827b3c9620747d2f553
Publikováno v:
IEEE Access, Vol 5, Pp 17660-17670 (2017)
In this paper, we consider downlink non-orthogonal multiple access cooperative communication system. The base station (BS) serves two types of users, which are named relay user (RU) and far user (FU). The BS and RU are equipped with multiple transmit
Externí odkaz:
https://doaj.org/article/467b7225bfbe4a6da59f140da2d3e9de
Publikováno v:
Sensors, Vol 20, Iss 19, p 5713 (2020)
Upcoming 5th-generation (5G) systems incorporate physical objects (referred to as things), which sense the presence of components such as gears, gadgets, and sensors. They may transmit many kinds of states in the smart city context, such as new deals
Externí odkaz:
https://doaj.org/article/b6a5278f2a23460ea7cfff54b806c752
Publikováno v:
Entropy, Vol 15, Iss 7, Pp 2524-2547 (2013)
Femtocells represent a novel configuration for existing cellular communication, contributing towards the improvement of coverage and throughput. The dense deployment of these femtocells causes significant femto-macro and femto-femto interference, con
Externí odkaz:
https://doaj.org/article/113857937a2a4fe49837a900226a37f9
Publikováno v:
International Journal of Distributed Sensor Networks, Vol 12 (2016)
A number of nodes that are interested in the same content can be grouped into a cluster and the cluster head can be used to relay the content received from the base station (BS) to the cluster members using device-to-multidevice (D2MD) communication.
Externí odkaz:
https://doaj.org/article/cc8369e802b0419ba2c9578b0d0837be
Publikováno v:
Sensors, Vol 18, Iss 8, p 2665 (2018)
Cognitive capabilities are indispensable for the Internet of Things (IoT) not only to equip them with learning, thinking, and decision-making capabilities but also to cater to their unprecedented huge spectrum requirements due to their gigantic numbe
Externí odkaz:
https://doaj.org/article/e0b90a2cd5bc4b0fb02037e8bbfbb4f2
Publikováno v:
International Journal of Distributed Sensor Networks, Vol 11 (2015)
The complexity of channel estimation algorithms is of critical importance in high mobility orthogonal frequency division multiplexing (OFDM) systems. To reduce the complexity of the algorithm, the existing channel estimation algorithms take advantage
Externí odkaz:
https://doaj.org/article/77f9c2823c0f4b38a748d780254ce3f8
Publikováno v:
Sensors, Vol 16, Iss 12, p 2046 (2016)
This paper highlights three critical aspects of the internet of things (IoTs), namely (1) energy efficiency, (2) energy balancing and (3) quality of service (QoS) and presents three novel schemes for addressing these aspects. For energy efficiency, a
Externí odkaz:
https://doaj.org/article/980b878d079344fba18b67a453be08b4