Pyeong-Jung Song
Electronics and Telecommunications Research Institute
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Publication
Featured researches published by Pyeong-Jung Song.
IEEE Transactions on Antennas and Propagation | 2015
Jung-Nam Lee; Kwang-Chun Lee; Pyeong-Jung Song
A dual-polarized small base station antenna is presented that has a metallic cube and high isolation. The antenna is composed of a micro-strip feed line board, planar dipole radiators, micro-strip coupling feeds, a metallic cube, and a radome. The measured impedance bandwidth is 2.36-2.95 GHz at port-1 and 2.4-2.83 GHz at port-2. The proposed base station antenna has a high isolation of greater than 40 dB at the operating frequency. The measured peak gain is 9 dBi, and the cross polarizations are all less than 25 dB below the co-polarization level.
Progress in Electromagnetics Research C | 2013
Jung Nam Lee; Kwang Chun Lee; Pyeong-Jung Song
A dual-polarized small base station antenna with a dielectric feeding structure is presented. The proposed antenna is composed of a micro-strip feed line board, eight metallic shorting plates, four dielectric feed substrates, four metallic radiators, a metallic cube, and a radome. A wide impedance bandwidth of 20% (2.45 to 3.0GHz) is achieved. The proposed antenna has an isolation of greater than 50dB over the operating bandwidth. Details of the proposed antenna design, and the simulated and measured results are presented and discussed.
international computer science and engineering conference | 2013
Sangchul Oh; Byung-Han Ryu; Yeon-Seung Shin; Pyeong-Jung Song; Dong-Seung Kwon
Component carriers (CCs) in a Long Term Evolution - Advanced (LTE-A) system are limited by maximum 100 radio bearers (RBs) on a 20 MHz CC due to a fixed 15 KHz subcarrier bandwidth. However it is able to be changed in the future, so that a study regarding heterogeneous CCs which have diverse RBs above 100 on a CC is needed at this moment. To support non-contiguous carrier aggregation (CA) with the these conditions, a heterogeneous joint CC packet scheduling algorithm interacting with a radio resource control (RRC) is considered in this paper. The performance of the joint CC packet scheduling algorithm on heterogeneous CCs with different channel characteristics has been analyzed and compared through computer simulations as well. According to the results, we found that an 800 MHz CC exhibits approximately 4 dB better channel gains than a 2.1 GHz CC. We also obtained a capacity increase of about 15-40% for a joint CC maximum rate (MR) algorithm and about 2-28 % for a joint CC proportional fair (PF) algorithm when the number of users is increased. On the other hand, in a round-robin (RR) scenario, we were unable to notice any differences between the independent CC and joint CC packet scheduling policies. Furthermore, looking at the impacts of different amounts of RBs on 800 MHz + 2.1 GHz CCs, we can conclude that a one-to-one RB ratio with respect to the MR, PF, and RR algorithms has a better performance compared to other cases, and thus, owing to the better channel gain, the smaller the RBs of the 800 MHz CC, the better the performance achieved.
advances in mobile multimedia | 2013
Hyung-Deug Bae; Jaewook Shin; Pyeong-Jung Song
Inter-frequency small cell deployments on hotspot locations are seen as a potential solution to offload macro user traffic to small cells. In order to discover inter-frequency small cells, macro user equipments (UE) are required to perform gap-assisted measurement. The currently existing short measurement periods can increase offloading, but at low UE speeds, it leads to unnecessarily measurement to scan neighbor cells and results in waste of UE battery. Long measurement periods are discussed in 3GPP to reduce UE power consumption. However, due to long measurement periods and consequently delayed cell discovery, inter-frequency mobility and offloading performance are degraded, especially at UE high speeds. In this paper, it is shown using simulation that mobility performance and the small cell dwelling time are degraded at high UE speeds when adopting the long measurement periods. Based the simulation results, it is proposed that applying the long measurement period is effective for low mobility UE to reduce the UE power consumption while keeping the acceptable handover failure rate and the offloading performance.
Archive | 2008
Pyeong-Jung Song; Soo-Chang Kim; Yeon-Seung Shin; Yeong-Jin Kim
Archive | 2005
Jong Chan Lee; Soo-Chang Kim; Pyeong-Jung Song
Archive | 2009
Pyeong-Jung Song; Hyun-Seo Park; Yeon-Seung Shin; Yeong-Jin Kim
Archive | 2005
Dong-Jin Shin; Jisoo Park; In-Seong Park; Moon-Soo Jang; Pyeong-Jung Song
Archive | 2005
Jisoo Park; Moon-Soo Jang; In-Seong Park; Pyeong-Jung Song
Archive | 2005
Dong-Hoi Samhwan Apt. Kim; Pyeong-Jung Song