WCDMA CPICH: Common Pilot Channel Explained
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This page describes the CPICH, or common pilot channel, with respect to the WCDMA/UMTS system. The pilot channel is used by the base station to provide a reference to all mobile stations and to aid channel estimation at the terminals.
It has a predefined bit sequence (all 1s) which is scrambled with the cell-specific primary scrambling code. There are two types of CPICH: primary and secondary.