Starting from the last decade of the 90＇s mobile phone makes its appearance in the world markets, in Mexico it＇s also on that date that the first companies are formed, today there are only four mobile companies that...Starting from the last decade of the 90＇s mobile phone makes its appearance in the world markets, in Mexico it＇s also on that date that the first companies are formed, today there are only four mobile companies that compete strongly for the Mexican market, In this article we use the logistic model （S - shaped logistic curve）, which describes competitive environments, especially for the popularization of new technologies, to describe the dynamics of the telecommunications sector in Mexico and the probability of the companies to fail and disappear in the market. In economic articles, we see more attention to the dynamics of monopolistic competition and power companies, but it is less used the study of the sales dynamics of the sector and the curves that represent it. The proposed model uses as data the total number of subscribers to mobile phone lines to generate the logistic curves of each company and the total market, in search of main points singularities and stability conditions as predictors of the extinction of technologies and the shot-down of companies in the sector.展开更多
针对在均匀散射体分布以及空间对称的3-D室内移动通信环境,细化了对于基站(BS,Base Station)以及移动台(MS,Mobile Station)端空间角度的研究。对在指向性天线覆盖下的室内微小区移动通信环境下,模型能估计多径衰落信道的重要空时信道参...针对在均匀散射体分布以及空间对称的3-D室内移动通信环境,细化了对于基站(BS,Base Station)以及移动台(MS,Mobile Station)端空间角度的研究。对在指向性天线覆盖下的室内微小区移动通信环境下,模型能估计多径衰落信道的重要空时信道参数,如波达信号在水平面以及竖直平面上的信号到达角度(AOA,Angle of Arrival)以及到达时间(TOA,Time Of Arrival)。数值仿真结果与2-D多径衰落信道对比表明本模型的信道参数估计结果符合理论和经验,扩展了3-D空间统计信道模型的研究和应用。展开更多
文摘Starting from the last decade of the 90＇s mobile phone makes its appearance in the world markets, in Mexico it＇s also on that date that the first companies are formed, today there are only four mobile companies that compete strongly for the Mexican market, In this article we use the logistic model （S - shaped logistic curve）, which describes competitive environments, especially for the popularization of new technologies, to describe the dynamics of the telecommunications sector in Mexico and the probability of the companies to fail and disappear in the market. In economic articles, we see more attention to the dynamics of monopolistic competition and power companies, but it is less used the study of the sales dynamics of the sector and the curves that represent it. The proposed model uses as data the total number of subscribers to mobile phone lines to generate the logistic curves of each company and the total market, in search of main points singularities and stability conditions as predictors of the extinction of technologies and the shot-down of companies in the sector.
文摘针对在均匀散射体分布以及空间对称的3-D室内移动通信环境,细化了对于基站(BS,Base Station)以及移动台(MS,Mobile Station)端空间角度的研究。对在指向性天线覆盖下的室内微小区移动通信环境下,模型能估计多径衰落信道的重要空时信道参数,如波达信号在水平面以及竖直平面上的信号到达角度(AOA,Angle of Arrival)以及到达时间(TOA,Time Of Arrival)。数值仿真结果与2-D多径衰落信道对比表明本模型的信道参数估计结果符合理论和经验,扩展了3-D空间统计信道模型的研究和应用。
