A gold code is a set of random sequences, often called pseudo-noise (PN) sequences, that are statistically uncorrelated....
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Gold codes are used in CDMA as chipping sequences that allow several callers to use the same frequency, resulting in less interference and better utilization of the available bandwidth. A useful way to think of gold codes is as a generalization of orthogonal vectors as explained in this explanation of synchronous and asynchronous CDMA.
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