By John Walker

Deals up to date details on advancements in cellular details structures. The textual content additionally provides an outline of the sphere, together with GSM, mobile radio, cellular info and ITS. extra sections hide satellite tv for pc navigation platforms, digital tolling and highway pricing.

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Additional info for Advances in Mobile Information Systems (Artech House Mobile Communications Library)

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However, the radiation of a carrier frequency alone will not convey any information. The carrier has to be modulated by a continual change in its amplitude, frequency, or phase in accordance with the information stream. The bandwidth occupied by a modulated signal usually is within the range of a few times greater or smaller than the information rate (for digital streams, that is the bit rate). Much effort has been expended in the design of modulation methods that reduce the radio frequency (RF) bandwidth to the minimum necessary to improve spectrum utilization.

The agendas for WRCs two and four years ahead are formally set by the ITU Council, but the content is identified by participants at previous WRCs. So far, those expectations have not been altogether achieved. The pace of development of new radiocommunication systems and the economic imperatives for obtaining secure frequency assignments before major long-term investment have made Page 16 it difficult to limit the scope of each WRC. It also has been difficult to identify topics that can be deferred to four years' time rather than two years, thus compressing a diverse preparatory process into a very short study phase.

The aims of this book are to: Bring together in one volume some of those diverse strands and indicate how they relate to each other; Give an up-to-date review of the current technology by experts in each field; Identify synergies between the topics; Attempt to predict future developments. 4 Which Topics and Why Because the field of mobile information systems is large and diverse and has grown considerably in the last 10 years, some selection of topics is necessary, more so than in the previous edition, which was able to address paging and in-vehicle systems in the space of one book.

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