TDM and FDM
April 11th, 2007 | by A T M |If you happen to read any primer books on wireless systems, opening chapters of those will describeTime Divison Duplex(TDD) systems and Frequency Division Duplex systems (FDD).
All fine. Very easy to understand. But there’s a problem if they leave it at just that point.
Reader might be led to believe that TDM is better than FDM and CDM is better than TDM and so on…
In reality, there exists no pure Time Division Multiplexed or Frequency Division Multiplexed systems.
TDMA systems (our GSM systems) are a mix of TDD and FDD.
In GSM, you are given a chunk of bandwidth to use.First you divide them into several different frequencies (FDD) and on each particualr frequency you will give a slice of time for different users(TDD).
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