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Level Crossing Rate and Average Fade Duration Analysis in Ku-band Satellite Link
Franklin, Fondjo Fotou,Fujisaki, Kiyotaka,Tateiba, Mitsuo 통신위성우주산업연구회 2006 Joint Conference on Satellite Communications Vol.2006 No.-
The level crossing rate (LRC) analysis of a random process brings out useful information about the underlying process. Combined with the average fade duration of the fading channel, it find diverse applications in the evaluation and design of efficient communication system. The statistics of fading time intervals is of great importance because it is closely related to the statistics of error bursts, the outage probability and fading rate. Analyses verified the conservation law and showed that for 3 stations the obtained LCR variation is conserved. In addition, we presented the effect of the sampling period on the LCR.
Empirical study on mobile satellite link using portable GPS receiver
Abidin, Wan Azilan W. Z.,Fujisaki, Kiyotaka,Tateiba, Mitsuo 통신위성우주산업연구회 2006 Joint Conference on Satellite Communications Vol.2006 No.-
In order to give a high quality mobile satellite (MS) services, it is of vital importance to tackle the issue of signal degradation due to factors such as multipath fading and shadowing effect. The advancement of the Global Positioning System(GPS) technology nowadays allows the commercially available, portable GPS receivers to be manipulated in the study of the MS link quality evaluation system. Apart from being low in cost, these receivers are simple to manage which will greatly reduce the time and cost of doing research. In this paper, the measurement methodology utilizing a portable GPS receiver used to extract important MS propagation parameters is explained and discussed. It describes in detail how the experiment was set up and how the measurement was conducted. We presented results obtained from the empirical data and made comparison between various MS environmental conditions that show the feasibility of using GPS in this research. The outcome of this research work will be used as part of a MS link evaluation system going to be developed based on raw propagation data obtained from portable the GPS receivers.
Fade Dynamics on Earth-space Paths at Ku-band in Fukuoka, Japan Evaluation and Comparison
Franklin, Fondjo Fotou,Fujisaki, Kiyotaka,Matsuoka, Tsuyoshi,Tateiba, Mitsuo 통신위성우주산업연구회 2005 Joint Conference on Satellite Communications Vol.2005 No.-
Recently, the ITU-R released through the reference ITU-R P.1623 the new fade slope and fade duration models. As a contribution to the worldwide measurements and globally applicable models development, this paper evaluates and discusses the fade slope and fade duration derived from the received signal level collected in 4 close stations located in about 12 km of diameter in Kyushu island, Japan. From the obtained results, particular observations are made for the case of our region and some modifications of the ITU-R models are proposed.