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A CDMA or Code Division Multiple Access system makes use of the codes having particular features in order to separate several users, to allow the access to the shared medium without any interference. The users utilize the same frequency and time for transmitting the data. The main problem involves finding out the good codes and to free this signal from the noise. The good code may be found by the following 2 characteristic:
a) Orthogonal.
b) Auto Correlation.