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ACCESS SCHEMES
For radio systems there are two resources, frequency and time. Division by frequency, so that each pair of communicators is allocated part of the spectrum for all of the time, results in Frequency Division Multiple Access (FDMA). Division by time, so that each pair of communicators is allocated all (or at least a large part) of the spectrum for part of the time results in Time Division Multiple Access (TDMA). In Code Division Multiple Access (CDMA), every communicator will be allocated the entire spectrum all of the time. CDMA uses codes to identify connections.
Posted by waqasahmad
Spreading spreads each symbol worth a 64 digit orthogonal WC code.This code separated the data from other signals in the same cell.The spreading increases the data rate by factor of 64. The data from the spreading block is referred to as chips.The data rate is now 1.2288mcps(mega-chips per second).
Posted by crouse
Spreading spreads each symbol worth a 64 digit orthogonal WC code.This code separated the data from other signals in the same cell.The spreading increases the data rate by factor of 64. The data from the spreading block is referred to as chips.The data rate is now 1.2288mcps(mega-chips per second).
Posted by hudson
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