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Concept question of CDMA

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guillaumechen

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Hi everyone,

I have a concept question about CDMA.

For the following problem:
two CDMA codes containing 1 and -1 values that do not allow the two receivers to extract the original transmitted bits from the two CDMA senders.

From the above condition, I consider that the cause of this problem is due to the same code using by different users at the same time (without any delay) [i.e. cross correlation & auto correlation are both "one"]. Is my assumption correct or not? Thanks a lot!!

cross correlation = The correlation of two different codes. The value should be as small as possible.
auto correlation = The correlation of a code with a time-delayed version of itself. In order to reject multi-path interference, this function should equal 0 for any time delay other than zero.
 

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