6 research outputs found
Variation of Antenna Pattern Considering Transmission Tower Reflector
In this paper, the antenna pattern considering
broadcasting transmission tower is characterized.
The simulation results by the FDTD(finite difference
time domain) method show that attached structures
can distort the antenna pattern.
Also, this paper describes the measurement of
broadcasting transmission tower and reflectors
model. The measurement results show that the
proposed FDTD method better than conventional
method.λ³Έ λ
Όλ¬Έμ BK 21 Project μ μ§μμΌλ‘ μμ±νμλ€
Through-wall Characterization of Ultra WideBand signal
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Όλ¬Έμ Brain Korea 21 project μ μμΈμ μ°ν
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(10544)μ λμμΌλ‘ μμ±λμμ΅λλ€
Outdoor 4X4 MIMO Channel Measurements and Analysis at 5.8GHz in Campus Environments
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λμ 4 κ°μ μμ
μν
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μλ€. μ€ν μ₯μμΈ κ΄μ
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κ³ , κ° μ§μ μμ μμ λ μμ¬μ‘μ μνμ€(Pseudo-Noise sequence)λ₯Ό μ΄μμ μΈ μμ¬μ‘μ μνμ€μ
μνΈμκ΄ νμ¬ μ±λμ νΉμ±μ μμ보기 μν΄ μνλμλ€. κ·Έλ¦¬κ³ μνΈμκ΄μ λ°νμΌλ‘ μ λ ₯ μ§
μ° νλ‘νμΌ(Power Delay Profile)κ³Ό tapped delay line μ±λ λͺ¨λΈμ ꡬνμλ€. λν μ΄ λͺ¨λΈμ μ΄μ©
ν΄μ κ΄λμ(wideband) μ±λ μ©λκ³Ό νλμ(narrowband) μ±λ μ©λμ ꡬνκ³ λΆμνμλ€.This paper is supported by BK21 project and Seoul
R&BD program(10544)
Body area network pathloss and frequency correlation coefficient modeling in ultra-wide band
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Όλ¬Έ(μμ¬) --μμΈλνκ΅ λνμ :μ κΈ°. μ»΄ν¨ν°κ³΅νλΆ, 2009.2.Maste
Localization Algorithms Using Wireless Communication Systems
μ¬μ©μμ μμΉλ₯Ό κ³ λ €ν λ§μΆ€ν μμΉκΈ°λ°μλΉμ€ μ 곡μ μν΄μλ μ¬μ©μμ μ νν μμΉλ₯Ό μΆμ νλ κΈ°λ² κ°λ°μ΄ μ νλμ΄μΌ νλ€. λ³Έ λ
Όλ¬Έμμλ 무μ ν΅μ μμ€ν
μ κΈ°λ°μΌλ‘ μ¬μ©μμ μμΉλ₯Ό μΆμ νλ κΈ°λ²μ λν μ°κ΅¬λν₯μ μ΄ν΄λ³΄κ³ μ΄κ΄λμ ν΅μ μμ€ν
μμ μ§μ°λ³μλ₯Ό μ΄μ©ν 볡ν©ν 무μ μΈ‘μ κΈ°λ²μ μ μνλ€. λ¨Όμ , 무μ μΈ‘μλ₯Ό μν μ΄κ΄λμ ν΅μ μ μ₯, λ¨μ μ λ€λ₯Έ ν΅μ μμ€ν
κ³Ό λΉκ΅ν ν 무μ μΈ‘μμ μ¬μ©λλ μΈ‘μ νλΌλ―Έν°μ λ°λ₯Έ κΈ°λ²λ€μ μκ°νλ©° νμ¬ μ§νλκ³ μλ 볡ν©ν 무μ μΈ‘μ κΈ°λ²μ μ°κ΅¬λν₯μ μ΄ν΄λ³Έλ€. λͺ¨μ μ€νμ ν΅ν΄ μ»μ΄μ§ μ±λ₯λΆμκ²°κ³Όλ₯Ό μ΄μ©νμ¬ μ§μ°λ³μ κ°μΌλ‘λΆν° κ°μκ²½λ‘μ μ‘΄μ¬ μ , 무λ₯Ό νλ¨νκ³ κ·Έμ λ°λΌ 거리 μΆμ κ°μ μ ννλ 볡ν©ν μΈ‘μ κΈ°λ²μ μ μνλ€.;For efficient Localization Based Services, development of accurate localization algorithm has to be preceded. In this paper, research trend of localization algorithm using Ultra WideBand (UWB) radio is reported and hybrid localization algorithm using delay parameters is proposed. As communication for localization, the UWB is compared with other systems. After introducing localization algorithms using UWB, proposed hybrid algorithms are presented. In our proposed hybrid algorithm, anchor nodes determined the existence of line-ofsight path from measured delay parameters. Then, using time of arrival and received signal strength information, calculated range estimation results are sent to the central processor. The performance of our algorithm is compared to existing algorithms using simulation and it is confirmed that about 20% of localization error of conventional localization algorithm using TOA is reduced in localization algorithm with three base stations.λ³Έ μ°κ΅¬λ λΆλΆμ μΌλ‘ SKν
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Simulation of Antenna Pattern Considering Transmission Tower and Verification of Simulation Results
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