CDMA (Code Division Multiple Access) is a digital cellular technology that uses spread-spectrum techniques. Unlike competing systems, such as GSM, that use TDMA, CDMA does not assign a specific frequency to each user. Instead, every channel uses the full available spectrum. Individual conversations are encoded with a pseudorandom digital sequence. CDMA is actually a military…

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Analog networks still exist in most wireless network infrastructures, but are being quickly phased out by newer and more efficient digital networks. The reason that service providers must keep analog around is that the combination of unlike digital networks cannot readily communicate and interchange information directly with each other. In other words, AT&T’s Digital TDMA…

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It’s hard to imagine that in some parts of the world, wireless devices and their corresponding networks are nearly as powerful and as fast as the desktop PC. That excitement is driving service providers and software developers around the globe to design mobile applications that will enable business users to perform functions that were never…

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Introduction An area that we’ve spent little time on in this book up to now is the wireless network. This book is, after all, intended to be a guide for mobile business and strategy, but it should not exclude an understanding of the technology that makes it all happen. It’s important to understand the technical…

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The virtual keyboard already exists, and it has been shown in action. You put straps over the palms of your hands. The keyboard then recognizes how you move your muscles and can subsequently identify which keys you would be using on a QWERTY keyboard. The clever part is that there is no keyboard—you are simply…

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