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In this paper, effects of noise on performances of frequency characteristics compensation filter was evaluated. Three types of noise were considered in this paper and it was shown that the effect of the filter was greatly decreased by receiver noise. This is because of miss-estimation of transmission characteristics. To reduce the effect of receiver noise, averaging technique was introduced. It was...
Space division multiple access (SDMA) has been expected for improving frequency utilization efficiency in mobile communication systems. In such a system, communication quality is deteriorated when user terminals close to each other because the signals from each user terminal can not be separated by directional pattern in that situation. This paper describes the effects of path visibility on space...
High speed wireless communication system attracts much attention in recent years. To realize the high speed wireless communication system utilizing ultra-wide-frequency bands, a broadband antenna must be required. However, it is difficult to obtain the antenna which has uniform characteristics in broad frequency band. More over, propagation characteristics are also distorted in multi-path environment...
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