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디지탈 이동통신에서의 주파수선택성 페이딩보상에 관한 연구
張大錫 군산대학교 1991 群山水産專門大學 硏究報告 Vol.25 No.2
Because of the effects of the frequency selective fading by the multipath in digital mobile radio communications, it is necessary to establish the anti-fading techniques. In this paper an analysis of the multipath in the digital radio wide band transmission system was investigated, and computer simulation was carried out on the BER in case of the adoption of four elements adaptive arrays. The result shows that CMA adaptive - array method is of fective in the anti-selective frequency fading.
장대석,김영랑 群山大學校 情報通信技術硏究所 1999 情報通信技術硏究論文集 Vol.3 No.-
This paper provides the methods of improving the service quality by analyzing the problems in operating ISDN systems. The main features of the proposed methods are shown as follows; 1) the improvement of ISDN switching systems in the aspects of both hardware and software, by having enough capacity of it, 2) the enhancement of interworking between PC networks and intenrnets of ISDN systems, and 3) the enlargement of the unification of ISDN-PSTN networks, and construction of common channel signal networks
문정원,장대석 群山大學校 情報通信技術硏究所 1998 情報通信技術硏究論文集 Vol.2 No.-
In this paper, theoritical calculations using M. Hata Model have been carried out in the wave pass in Chonbuk area, the measurements have been confirmed in the each path, and compared with theoritical results. The analyzed results show that Okku station has the more stable charateristics than Chunju and Kunsan, the values of pass loss are low in the wide road width, in the lots of cross points, in the linear roads, and those of the loss are high in the crowded area which has many buildings and hills.