today, mobile phone as one of manifestations of new communication technology plays an important role in human individual and social life and it is included an inseparable part in their daily relations so that we can claim that life is impossible without it for many of people or at least it doesn't have any desirability. the influence of mobile phone applications in life different matters, ...

In recent years, the demand for mobile operation of all types of electronic systems has become significant. It seems that by merely providing the same functionality of a desktop system in a mobile unit, a significant market advantage can be obtained for virtually any electronic function. Consumer electronics companies have been highly successful by creating portable televisions, video tape reco...

Figure 1 gives a rough overview of some prominent wireless communication systems focusing on the two parameters gross data rate and relative speed between sender and receiver. Assuming a mobile end-user connected to a stationary transceiver station, the points on the (non proportional) speed axis resemble nonmoving persons, pedestrians, cars downtown, cars outside cities, and cars on a highway,...

Recently, there is an increasing yet challenging demand on broadband mobile communications for high-speed trains. In this article, cognitive Doppler spread compensation algorithms are proposed for high-speed rail broadband mobile communications, which make use of the dedicated radio environment map (REM) for railway to compensate the time-varying Doppler spread. The dedicated REM for high-speed...

With the constant development of customer relationship management (CRM) theory and the maturity of business intelligence technology, the analysis-based CRM has become a hot topic in the academic field. Some enterprises have begun to put the analysis-based CRM to practice; however, there have been few successful applications because of the inadequate mastery of business intelligence technology a...

Despite the fact that 4G deployment is still at its infancy there are already many research initiatives that focus on the next generation of mobile communications. But why there is a need for a new generation to be shaped so closely to the previous one? Is it really a need behind it by the community or the companies are seeking new ways to sustain or enhance their profits. In this paper we high...