Why does increased spectral overlap across multiple users degrade the performance of a Code Division Multiple Access (CDMA) cellular network?

💡 Explanation

CDMA relies on unique codes to separate signals in the same frequency band. Increased spectral overlap caused by more users means that the cross-correlation between codes increases, making signal separation more difficult because the desired signal is harder to distinguish from noise. Therefore, signal separation fails, rather than power increases being the core issue.

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