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In this article, dynamic wireless BAN channel measurement results using a male specimen in a radio anechoic chamber, and the statistical channel model of body surface propagation with dynamic movement of a human being were presented. We found that the log-normal and Weibull distribution can provide a good characterization of dynamic channel behavior due to small and large movements, respectively,...
We have developed new compact MIMO DRA for 802.11n system. The antenna has three independent orthogonal channels which can offer high efficiency and high diversity gain. The simulation result closely matches with measured result in S-parameter and radiation pattern. The new DRA antenna is compared with three spaced dipoles in a commercial 802.11n terminal in an office environment. The measurements...
Multiple input, multiple output (MIMO) is an antenna technology for wireless communications in which multiple antennas are used at both the source (transmitter) and the destination (receiver). The antennas at each end of the communications circuit are combined to minimize the errors and to optimize the data speed. MIMO-based antennas are of interest in relation to communication such as digital TV,...
In this paper, we evaluated the transmission gain of ultra wideband radio by using the Friispsila transmission formula. However, it is not directly applicable to ultra wideband impulse radio (UWB-IR) transmission systems. This paper presents the link budget evaluation formula in the term of transmission gain for the UWB-IR systems that takes into account the transmitted waveform, its distortion due...
In this paper, the ground reflection path loss based on average power loss for ultra wideband (UWB) communications is proposed. The expression is derived from the rectangular passband waveform and extension of Friis" transmission formula in the terms of the closed form formula based on average power loss. The results are compared with other models and verified with the measurement result. From...
Among the propagation engineers for the mobile and wireless systems, single- and double-directional propagation measurements and modeling in the multipath environments are major concerns for the decade. The directional propagation model is the antenna-independent propagation model so as to evaluate the performance of the antennas in the specific wireless system. Therefore, the model is mainly beneficial...
In free space propagation loss is usually evaluated by using the Friis' transmission formula. However, it is not directly applicable to ultra wideband impulse radio (UWB-IR) transmission systems. This paper presents the link budget evaluation formula for UWB-IR systems that takes into account the transmission signal waveform, its distortion due to the antenna, and the receiver. Since the antennas...
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