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MRC Analysis of Cooperative Diversity with Fixed-Gain Relays in Nakagami-m Fading Channels
Hyundong Shin,Ju Bin Song IEEE 2008 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.7 No.6
<P>We derive the exact maximal-ratio combining (MRC) performance of dual-hop cooperative diversity systems with L-antenna destination reception in Nakagami-m fading channels, where a single-antenna relay operates in fixed-gain (semi-blind) amplify-and-forward (AF) mode. We also show that if m<SUB>0</SUB>, m<SUB>1</SUB>, and m<SUB>2</SUB> are the respective Nakagami parameters for the source-to-destination, source-to-relay, and relay-to-destination links, the fixed-gain AF cooperation with MRC achieves the diversity order of m<SUB>0</SUB>L + min {m<SUB>1</SUB>, m<SUB>2</SUB>L}.</P>
신현동(Hyundong SHIN),이영기(Youngki LEE),김희동(Heuydong KIM) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
When a shock wave arrives at an open end of tube, an impulse wave is discharged from the tube exit and<br/> causes serious noise and vibration problems. In the current study, the effect of the cross-sectional area of tube<br/> on the impulse wave is numerically investigated using a CFD method. The Harten.Yee’s total variation<br/> diminishing(TVD) scheme is used to solve the axisymmetric, two-dimensional, unsteady, compressible Euler<br/> equations. With three different cross-sectional areas of tube, the Mach number of the incident shock wave Ms<br/> is varied between 1.01 and 1.5. The results obtained show that the directivity and magnitude of impulse wave<br/> strongly depend upon the Mach number of incident shock wave and are influenced by the tube area. It is also<br/> known that the tube cross-sectional area significantly affects the magnitude of impulse wave at or near the<br/> tube axis.
Evaluation of vaccines for the SAT 1, SAT 2, and SAT 3 serotypes of Foot-and-Mouth Disease in pigs
Hye-Eun Jo(Hye-Eun Jo),Su-Hwa You(Su-Hwa You),Joo-Hyung Choi(Joo-Hyung Choi),Mi-Kyeong Ko(Mi-Kyeong Ko),Sung Ho Shin(Sung Ho Shin),Hyundong Jo(Hyundong Jo),Min Ja Lee(Min Ja Lee),Su-Mi Kim(Su-Mi Kim) 한국예방수의학회 2019 한국예방수의학회 학술대회자료집 Vol.2018 No.-
Double Scattering이 존재하는 무선 전송로에서의 다중송수신안테나 다이버시티
신현동 경희-다반 ASIC 설계교육센터 2007 경희-다반 ASIC센터 논문집 Vol.8 No.-
Thc potential benefits of multiple-antenna systems may be limited by two types of channel degradations- rank deficiency and spatial fading correlation of the channel, In this paper, we assess the effects of these degradations on the diversity performance of multiple-input multiple-output (MIMO) systems, with an emphasis on orthogonal space-time block codes, in terms of the symbol error probability, the effective fading figure (EFF), and the capacity at low signal-to-noise ratio (SNR), In particular, we consider a general family of MIMO channels known as double-scattering channels-i.e., Rayleigh product MIMO channels -which encompasses a variety of propagation environments from independent and identically distributed Rayleigh to degenerate keyhole or pinhole cases bv embracing both rank-deficient and spatial correlation effects, It is shown that a MIMO system with (n)^U transmit and (n)^R receive antennas achieves the diversity of order n_(T)n_(S)n_(R)/max(n_(T)n_(S)n_(R)) in a double-scattering channel with n_(S) effective scatterers. We also quantify the combined effect of the spatial correlation and the lack of scattering richness on the EFF and the low-SNR capacity in terms of the correlation figures of transmit, receive, and scatterer correlation matrices. We further show the monotonicity properties of these performance measures with respect to the strength of spatial correlation, characterized by the eigenvalue majorization relations of the correlation matrices.
Hongcheol Shin,Hyundong Lee,Myeongsik Kong,Chorong Kim 보안공학연구지원센터 2016 International Journal of Software Engineering and Vol.10 No.10
Under the circumstances in which the distribution rate of water supply reaches 98.6%, efforts for stable operation of facilities are being carried out through a variety of studies. The asset management of water supply system using a life cycle cost analysis model is expected to be settled and stabilized within the next decade through continuous researches. An analysis model is divided into several stages of initial installation cost, maintenance cost, and disposal/replacement cost. In this research, a portion of YW filtration plant’s data was used to conduct an LCC analysis. Through an LCC analysis, asset management was performed and ways to efficiently distribute a budget and to ensure stability were proposed.