Differences in Wireless Technology

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Colin C


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December 27, 2012








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GSM uses wider 200 kHz channels instead of the 30 kHz channels that TDMA utilizes. Also, instead of having only 3 time slots like TDMA, GSM has 8 time slots thus allowing GSM to have more capacity. GSM was created in 1987 and was introduced to the U.S. in 1995. CDMA is based on a form of spread spectrum technology that separates voice signals by assigning them digital codes and spreads them within the same broad spectrum...
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CDMA technology dates back to the 1940s, when spread spectrum technology was used in military communications systems because it was resistant to interference from enemy signals. Qualcomm Corporation began developing a CDMA wireless system in the late 1980s that went into operation in 1996. The major cell phone providers that provide TDMA, GSM, and CDMA are AT&T, T-Mobile, and Sprint PCS, respectively...
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