April 2011
Intermediate to advanced
368 pages
11h 36m
English
Content preview from Secure Roaming in 802.11 Networks
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Chapter 2
The frequency spectrum is a limited natural resource that is in great demand and is, therefore,
regulated carefully. The governments in each locale allocate strictly-limited frequency
bands to each of the wireless communication service operators. The use of only Frequency
Division Multiple Access (FDMA) to provide multiple access does not provide sufficient
capacity for modern wireless communication systems; therefore, FDMA must be used in
combination with one or more other methods. A cellular system uses FDMA in combination
with Space Division Multiple Access (SDMA) to divide the coverage area into cells of many
smaller geographic units.
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