To establish wireless channel suitable for the cabin environment, the power coverage was investigated with distributed antenna system and centralized antenna system based on the actual measurement of channel impulse r...To establish wireless channel suitable for the cabin environment, the power coverage was investigated with distributed antenna system and centralized antenna system based on the actual measurement of channel impulse response. The results indicated that the distributed antenna system has more uniform power coverage than the centralized antenna system. The average relative errors of receiving power of both antennas were calculated. The optimal position of the centralized antenna was obtained by Gaussian function refinement, making the system achieve a better transmission power with the same coverage effect, and providing a reference for antenna location in the future real communication in the cabin.展开更多
Consider the random intervals In（W） ：= （wn -en/2,Wn ＋en/2）（mod 1） with their centers wn being i.i.d, but not necessary uniformly distributed on the circle T = R/Z and with their lengths decreasing to zero. Usi...Consider the random intervals In（W） ：= （wn -en/2,Wn ＋en/2）（mod 1） with their centers wn being i.i.d, but not necessary uniformly distributed on the circle T = R/Z and with their lengths decreasing to zero. Using the dimension theory in dynamical systems, we give conditions on which the circle is finitely or infinitely often covered by intervals {In （ w ） } n≥ 1.展开更多
基金Supported by the National High Technology Research and Development Program of China("863"ProgramNo.2009AA011507)+2 种基金National Science and Technology Major Project of the Ministry of Science and Technology of China(No.2009ZX03007-003)National Natural Science Foundation of China(No.61101223)Ph.D.Programs Foundation of Ministry of Education of China(No.20110032120087 and No.20110032110029)
文摘To establish wireless channel suitable for the cabin environment, the power coverage was investigated with distributed antenna system and centralized antenna system based on the actual measurement of channel impulse response. The results indicated that the distributed antenna system has more uniform power coverage than the centralized antenna system. The average relative errors of receiving power of both antennas were calculated. The optimal position of the centralized antenna was obtained by Gaussian function refinement, making the system achieve a better transmission power with the same coverage effect, and providing a reference for antenna location in the future real communication in the cabin.
基金supported by National Natural Science Foundation of China (Grant No.10971069)the Shanghai Education Committee Project (Grant No. 11ZZ41)
文摘Consider the random intervals In（W） ：= （wn -en/2,Wn ＋en/2）（mod 1） with their centers wn being i.i.d, but not necessary uniformly distributed on the circle T = R/Z and with their lengths decreasing to zero. Using the dimension theory in dynamical systems, we give conditions on which the circle is finitely or infinitely often covered by intervals {In （ w ） } n≥ 1.
