A gold code is a set of random sequences, often called pseudo-noise (PN) sequences, that are statistically uncorrelated.
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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