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The future development of the railway is highly desired to evolve into a new era where infrastructure, trains, travelers, and goods will be increasingly interconnected to provide high comfort, with optimized door-to-door mobility at higher safety. For this vision, it is required to realize seamless high data rate wireless connectivity for railways. To improve the safety and comfort of future railways,...
A monolithic polar transmitter (TX) subsystem that includes a CMOS Envelope Tracking (ET) amplifier and a RF SiGe BiCMOS power amplifier (PA) for mobile WiMAX applications is presented. Several versions of the ET amplifiers are designed and their power consumption and bandwidth considerations are discussed. Consequently, the entire polar TX system performances and design trade-offs are presented and...
The trend of future communication network is the All-IP network, which brings huge opportunities for mobile P2P network. The distributed computing mode of P2P technology replaces the centralized control mode in traditional telecommunication system, so it makes traditional communication network billing control come across a lot of difficulties. We propose a flow oriented billing model for mobile P2P...
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