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Simplex Downhill 최적화 기법을 기반으로 하는 간략화 된 DS/CDMA 역방향 링크 Rake Beamforming Method
이상근,이윤현,Lee Sang-Keun,Lee Yoon-Hyun 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.3A
본 논문에서는 CDMA2000 역방향 링크에서 DS/CDMA 용 rake structure antenna away에 적용되는 새로운 방식의 simplex downhill 최적화 기법 빔포밍 알고리즘을 제안하고 있다. 본 논문에서 제안한 방법은 요구되는 신호(파일럿) 분산 행렬과 간섭 분산 행렬을 사용하고 있으며, 빔포밍 가중치들은 simplex downhill 최적화 알고리즘을 사용하여 최대 SINR 기준에 따라 만들어 졌다. 본 논문에서 제안한 구조는 기존의 적응 빔포밍 알고리즘보다 더 적은 계산량, 개선된 수렴 속도와 성능을 제공한다. Simplex downhill 방법은 최적화되기 위한 결정함수의 값만을 요구하기 때문에 최적화되거나 준최적화된 가중치 벡터를 찾기에 적합한 방식이다. 또한 rake beamformer 성능을 공간 채널모델에서의 여러종류 파라미터 값에 대하여 분석하였으며, 기존 방식의 rake 수신기와 제안된 방식을 동일한 수신 전력에서 비교 분석하였다. We propose a new beamforming algorithm, which is based on simplex downhill optimization method in the presence of pilot channels in cdma2000 reverse-link, for the rake structure antenna array in DS/CDMA communication system. Our approach uses the desired signal(pilot) covariance matrix and the interference covariance matrix. The beamforming weights are made according to maximum SINR criteria using simplex downhill optimization procedure. Our proposed scheme provides lower computational load, better convergence speed, better performance than existingadaptive beamforming algorithm. The simplex downhill method is well suited to finding the optimal or sub-optimal weight vector, since they require only the value of the deterministic function to be optimized. The rake beamformer performances are also evaluated under several set of practical parameter values with regard to spatial channel model. We also compare the performance between conventional rake receiver and the proposed one under same receiving power.
Moment Method을 이용한 스트립 回折格子에 의한 TM 散亂
尹義重,李潤鉉 한국항공대학교 1991 論文集 Vol.29 No.-
무한한 길이를 가지며, 미소두께를 가지는 완전도체 strip 回析格子의 電流分布를 임의의 방향으로 부터 비스듬히 TM波가 入射하는 경우에 대해서 고찰하였다. TE波에 대해 경계조건이 만족되는 式을 얻고, 모멘트 法을 적용하여 電流分布와 반사계수를 구하였고, strip 상에 유도되는 전류분포에 대해서는 h=0.2[λ]경우에서 strip간격 s=2w일때 특성이 양호하였고, 반사계수는 strip 회절격자에 수직으로 입사한 경우 s=1[λ]이하일 때 좋은 결과를 얻었다. In this paper, current distribution for strip grating of perfect conductivity, infinite length and infinitesimal thickness are discussed for E-polarization plane wave are oblique incidence case from arbitrary direction. First all equation which satisfies the boundary condition is set up for the case of E-polarization. Then it is solved by the moment method to get the induced current density. In the result of computer simulation the reflection coefficient and current distribution induced the open surface of a strip grating. It is shown that the current density obtained good results provided the space=2w and h=0.2 [λ] and the reflection coefficient for a strip grating with normal incidence obtained good results for the spacing is less than one wavelength.
平行 結合 마이크로스트립 線路를 利用한 帶域通過필터에 關한 硏究
尹義重,李潤鉉 한국항공대학교 1990 論文集 Vol.28 No.-
This paper discribes on parallel coupled microstrip band pass filter synthesis procedure. Exact analysis of parallel coupled microstrip line structure, that is this proportionately is then performed by evaluationg the transmission coefficient as a function of frequency with the aid of a computer. The wide about 50% pass bandwidth could be obtained for a microstrip band pass filter of 4 and 6 [GHz] center frequency using the parallel coupled microstrip transmission line. A method for filter synthesis was proposed and correlation between analytical and computer simulation results showed good agreement for parallel coupled microstrip line structure.
마이크로스트립 線路를 利用한 低域 通過 필터에 關한 硏究
尹義重,李潤鉉 한국항공대학교 1990 論文集 Vol.28 No.-
This paper discribes on microstrip low pass filter synthesis procedure. Exact analysis of the low-high-low and high-low-high microstrip line structure, that is this proportionately is then performed by evaluationg the thransmission coefficient as a function of frequency with the aid of a computer. A method for filter synthesis was proposed and correlation betweeen analytical and experimental results showed good agreement for low-high-low and high-low-high microstrip line structure.