ACPR

Adjacent Channel Power Ratio (ACPR) is a measurement of the amount of power in the adjacent frequency channel. ACPR is usually defined as the ratio of the average power in the adjacent frequency channel to the average power in the transmitted frequency channel.

It describes the amount of power generated in the adjacent channel due to nonlinearities in RF components. The ACPR measurement is part of the UMTS standard but is not a part of the cdmaOne standard.