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High resolution method for direction of arrival (DOA) estimation using array antenna is studied actively. In almost previous studies, it is assumed that the antenna elements have the same directional patterns. However, it is very difficult to make many antenna elements they have just the same directional patterns. Furthermore, the directional patterns are distorted due to mutual coupling between the...
UWB is a short range (up to 10 m) wireless communication technology which provides high throughput with low transmission and high reliability. We developed a PHY prototype conformed to ECMA-368, one of UWB standards, and a network simulator for evaluating MAC throughput of ECMA-368. In this paper, we propose an evaluation method considering the characteristic of PHY, the channel model and the propagation...
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...
Wireless broadband communications such as UWB, WiMAX et. al. have been put into services in Japan, in order to realize high-speed transmission systems. Such a system enables to transmit movies from a person to the other person in the winking of an eye. To realize such wireless broadband communications, wideband antennas have been required. This paper describes the bandwidth limitations of ultra-wideband...
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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