Sökning: "cellular phone"
Visar resultat 1 - 5 av 10 avhandlingar innehållade orden cellular phone.
1. Self-management in hypertension care
Sammanfattning : Despite effective treatment strategies for hypertension, many persons with hypertension still fail to reach recommended blood pressure targets. As hypertension is a significant risk factor for cardiovascular disease, measures are needed to decrease the mortality attributed to this condition and to facilitate an optimization of hypertension management. LÄS MER
2. Three problems with internetworking in cellular networks
Sammanfattning : Over the last decade, cell phones have gone from providing the traditional interactive voice service to also include support for Internet services. Cellular networks that originally were designed for cost-efficient voice services supply low bandwidth, high error rates and long round-trip delays, which poorly fit the generous header sizes, lack of error tolerance and reliance on retransmissions of the Internet. LÄS MER
3. Generating Road Traffic Information Based on Cellular Network Signaling
Sammanfattning : Cellular networks of today generate a massive amount of signalling data. A large part of this signalling is generated to handle the mobility of subscribers, irrespective of the subscriber actively uses the terminal or not. Hence it contains location information that can be used to fundamentally change our understanding of human travel patterns. LÄS MER
4. Integrated Transmitters for Cellular User Equipment–Wideband CMOS Power Amplifiers and Antenna Impedance Tuners
Sammanfattning : The digital cellular systems era started about thirty years ago with the release of the first digital cellphones. These first digital cellphones were very different from today’s slim and esthetic cellular pocket computers. They were not mass-produced in million units a day, and they were designed for radio performance rather than appearance. LÄS MER
5. Studies of Three Different Methods to Estimate the Up-link Performance of Mobile Phone Antennas
Sammanfattning : Antennas play an important role in determining the overall radio performance for wireless communications. If all other radio components perform according to their specifications, the performance of a mobile phone can be entirely determined by measuring the efficiency of its antenna. LÄS MER