By Eric Micheletti
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Extra info for After the Storm: Iraqi Wrecks and Fortifications
For push services, we can make a further separation into (Steininger et al. , a hurricane warning message). , a user who is looking for a date in their proximity). , where a user can visualize on a map the positions of all users matching the first user’s personal profile). Finally, the fourth criterion results in a distinction between person-oriented services and device-oriented services (Schiller and Voisard 2004). , personal navigation). , tracking of criminals). • Application. This approach categorizes a service according to its main target application.
For this reason, several localization systems and solutions are available and many others are still under research. For instance, the traditional satellite-based GPS represents a solution with worldwide coverage; however, it is not usable in some specific situations, such as in dense urban areas, indoors, underwater and underground. For these cases, many other systems are being developed or are even already available on the market. The book is organized as follows. Chapter 2 introduces location-based services as the main driver for wireless positioning.
Propagation loss, shadowing and multipath fading. Then, the possibilities and challenges of multiple-antenna techniques are discussed, focusing in particular on the two big families of spatial diversity and spatial multiplexing and on the gains achievable with them. , beamforming, is discussed later in the chapter, when we will treat space division multiple access (SDMA), an access technique that is based on beamforming. The chapter reviews modulation and access techniques, focusing in particular on OFDM and orthogonal frequency division multiple access (OFDMA), which are the most relevant techniques for future wireless positioning systems.