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Wireless Communications: What's in the Air
Look in every car: you see a man or woman talking on their cellular phone. Look in every home: you see children wirelessly surfing away on the Internet. Walk into any mall: you see young shoppers gabbing away on their wireless headset.
Without a question, this decade has emerged as and will define itself as the decade of wireless communications. The wireless revolution has enveloped us rapidly. From the 1990s, where only the richest could afford wireless communications, to today--where cellular phones are the primary method of communication in today's economic powerhouses like India and China--the change has been rapid.
Today's wireless landscape is a smorgasbord of short-range standards and long-range standards that are used for a wide variety of purposes. The standards are defined for very specific business purposes and seldom interoperate. By far, the most established method of wireless voice communication is cellular. Cellular communication has evolved over the past 15 years and in the United States is based upon two major standards: GSM (Global System for Mobile Communication) and CDMA (Code Division Multiple Access). The rest of the world has primarily aligned around the GSM standard.
Today, phones are equipped with multiple radios that can support GSM and CDMA, although individual carriers only support one standard, therefore resulting in roaming charges to …
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