What are the orthogonal Walsh codes? Why is synchronization among the users required for CDMA?
What will be an ideal response?
The Walsh code is a set of length-64 mutually orthogonal codes, which is used for
ensuring orthogonality between the signals for different users receiving from the
same base station. The Walsh code is also used for modulation for the reverse
channel of IS-95A. In CDMA system, synchronization among the users is
required. It is because at the receiver, the received signal is multiply with the
Walsh code. If the received signal is not desired, the output is zero. If the users
are not synchronized, the output of undesired signal will not be zero.
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