Zobrazeno 1 - 10
of 180
pro vyhledávání: '"Sang Won Choi"'
Publikováno v:
ICT Express, Vol 10, Iss 1, Pp 184-193 (2024)
Carrier Frequency Offset (CFO) is critical to the decoder performance of an Orthogonal Frequency Division Multiple Access (OFDMA) system and the conventional research works have coped with this issue. On the other hand, excessive enhancement of the e
Externí odkaz:
https://doaj.org/article/587700659194403ab72f64959138b4d7
Autor:
Yoon Tae Song, Sang Won Choi
Publikováno v:
IEEE Access, Vol 12, Pp 32192-32199 (2024)
In this paper, we provide a tutorial on the structured design of effective Physical Random Access CHannel (PRACH) preamble detection based on correlation power. Specifically, the main contribution of this paper is to provide the design methodology le
Externí odkaz:
https://doaj.org/article/cb25be9eb5454359ad720a09204e79cf
Publikováno v:
ICT Express, Vol 9, Iss 4, Pp 548-555 (2023)
This paper presents a tutorial on Deep Learning (DL) with Federated Learning (FL)-based indoor localization method for non-Independently and Identically Distributed (non-IID) fingerprinting databases. To this end, this paper explains systematic appro
Externí odkaz:
https://doaj.org/article/8d2256e452e54ad88bd999e8fced0ce9
Autor:
Sang Won Choi, Youngje Sung
Publikováno v:
Journal of Electromagnetic Engineering and Science, Vol 23, Iss 2, Pp 154-164 (2023)
A dual-feed antenna system with circular polarization (CP) diversity and high isolation is proposed in this paper. The proposed antenna consists of two bent monopole antennas and an isosceles triangular partial GND on a single layer. To simply design
Externí odkaz:
https://doaj.org/article/c3272b3d195b424689ac77ad2947267c
Publikováno v:
IEEE Access, Vol 11, Pp 142276-142291 (2023)
This paper presents an approach for enhancing indoor localization accuracy using a hybrid quantum deep neural network model (H-QDNN). To improve the accuracy of indoor localization based on contemporary techniques, we employ the combined strengths of
Externí odkaz:
https://doaj.org/article/512838cbf6bb48e3987c35231b34bd28
Autor:
Seunghwan Won, Sang Won Choi
Publikováno v:
IEEE Access, Vol 9, Pp 100223-100263 (2021)
This tutorial guides the reader through the open literature on the aspect of Initial Cell Search (ICS) in both Code Division Multiple Access (CDMA) and Orthogonal Frequency Division Multiple Access (OFDMA) systems perspectives with a special focus on
Externí odkaz:
https://doaj.org/article/c7e25c86552241349420af2d895d31e5
Autor:
Sang Won Choi, Jae Hee Kim
Publikováno v:
IEEE Access, Vol 9, Pp 135326-135333 (2021)
This paper presents a unified framework for Automatic Repeat reQuest (ARQ)-based retransmission schemes in multi-user broadcast environments. Two perspectives, namely, coded packet design and the enhancement of the ARQ protocol, are used to establish
Externí odkaz:
https://doaj.org/article/2ccdc39823724a38a8d88f960c9b0d05
Autor:
Seunghwan Won, Sang Won Choi
Publikováno v:
IEEE Access, Vol 8, Pp 116914-116960 (2020)
This survey provides the reader with the open literature on the detailed operational scenarios of Target Cell Search (TCS) in both 3G and 4G systems, with a particular emphasis on the DownLink (DL). There is no completely latest survey of the TCS sce
Externí odkaz:
https://doaj.org/article/735d4ce3a75d471098e536330ba34b48
Autor:
Jae Hee Kim, Sang Won Choi
Publikováno v:
IEEE Access, Vol 8, Pp 226059-226063 (2020)
In this article, we propose a deep neural network (DNN)for the radiation pattern synthesis of an antenna. The DNN utilizes the radiation patterns as inputs and the amplitude and phase of the antenna elements as outputs. Consequently, the radiation pa
Externí odkaz:
https://doaj.org/article/91310c69690042c882ac7c2f4da82731
Publikováno v:
IEEE Access, Vol 7, Pp 6545-6552 (2019)
To support the vehicular communication services that require low end-to-end transfer latency, the long-term evolution (LTE) specification recently defined a new channel sidelink, which enables direct data transfer among vehicle user equipments (UEs)
Externí odkaz:
https://doaj.org/article/904dc957f9f249caabe57c70836f1565