Radio Propagation Characteristics in the Large
City and LTE protection from STL interference
YoungKeun Yoon, JongHo Kim, MyoungWon Jung, YoungJun ChongRadio Technology Research Department, ETRI, Republic of Korea
ykyoon@etri.re.kr, jonghkim@etri.re.kr, mwjung@etri.re.kr, yjchong@etri.re.kr(Pt9)Abstract— This paper describes composite propagation effects of both the median pathloss and shadow fading in the largecity. In general, the propagation characteristic for the power profile of received signal has the relative power reduction andfluctuation according to distance to the receiver’s location far away from the transmitter. The result of these channel propagation
losses is due to the reduction of electric field in the air according to the separated distance between a transmitter and receiver, anddue to the multipath effect such as the plane reflection and edge diffraction of the propagated radio signals at the plane of buildings
and roads or vehicles etc. Propagated multipath radio signals via different paths may be simultaneously received to a target receiverwith different field strength and phases. Actually, it is not easy to how to predict the optimum radio propagation characteristics inthe large city from a transmitter to target receiver at the specific mobile or fixed communication link, because the outdoor
environment have the different height of transceivers and various structure factors such as buildings, roads, and vehicles in thelarge city including the urban, suburban and rural area. Therefore, the measurement is currently candidate solution for predicting
the radio propagation characteristics in the novel environments. In this paper, two different stations between a fixed and mobilestation are considered. Measurement results are compared with the general radio propagation model of 3GHz frequency and lower.
As another issue, we discuss and propose on the closed form of the interfering received signal strength intensity when two different
stations like a fixed system as the repeater and a mobile system as Long Term Evolution coexist in the same area. In the coexisting
environment, two different stations overlap the cell coverage and are assigned in the adjacent channel frequency. Therefore, thepotential interference may cause to their reception each other. Here, it is important to analyze the interference impact to the victim
station as a receiver from the interfering station as a transmitter to get out of the interference. In this paper, it is assumed that aninterfering station as a transmitter is fixed repeater and a victim station as a receiver is a mobile Long Term Evolution system. For
estimating interfering received signal strength intensity, it is issued to figure out a radio propagation characteristic. However, it isunknown for the available median pathloss model to apply for analyzing the performance of Long Term Evolution system frominterfering fixed repeater in the large city with none line of sight in the coexisting environment. Finally, we propose the medianpathloss characteristic from measuring the electric field strength of a fixed repeater as an interfering transmitter and calculated
interfering received signal strength intensity to a victim station. Using both the measurement and the theoretic calculation results,
the separated distance between an interfering transmitter and victim receiver is discussed for the protection of a victim
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(Pt9)Keyword—interference, wave, pathloss, fading
YoungKeun Yoon received B.S, M.S, and PhD degrees in radio engineering from National Chungbuk University, Korea, in 1997, 1999,and 2007, respectively. Since 2000, he has been working Electronics and Telecommunications Research Institute (ETRI). He has been
involved in the research of radio resource management and propagation since 2003. His main interests are radio propagation andspectrum engineering study in indoor and outdoor environments

JongHo Kim received B.S, M.S, and PhD degrees in electronic engineering from Chungnam National University, Daejeon, Korea, in1986, 1988, and 2006, respectively. Since 1989, he has been working for ETRI, Daejeon, Korea, where he is a principal member of theengineering staff of the Radio Technology Department. His main interests are radio propagation and spectrum engineering.

MyoungWon Jung received B.S, M.S, and PhD degrees in electronic engineering from Chungnam National University, Korea, in 2006,
2008, and 2014, respectively. Since 2009, he has been working for ETRI, where he is a senior member of research staff of the radio
technology department. His main interests are radio propagation study for mobile communication and millimeter wave propagation
study in indoor and outdoor environments.

YoungJun Chong received the B.S degree from the Jeju University, Jeju island, Korea, in 1992, and the M.S degree in electronics
engineering in 1994 from Sogang University, PhD degree in electronic engineering from Chungnam National University, Korea, in 2005,respectively. Since 1994, he has been with ETRI, Korea, where he is a leader of spectrum engineering section and principle member ofthe research staff of the radio technology department. He is currently involved in the development of the digital ultra-narrow band
walky-talky. His research interests include RF circuit and stations development