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ACPR

For many of the current and future transmission standards (IS-95 CDMA, WCDMA and variants, IS-54 NADC,…), ACPR (sometimes also termed adjacent channel leakage ratio-ACLR) is an important test parameter for characterizing the distortion of subsystems and the likelihood that a given system may cause interference with a neighboring radio. Since this distortion mechanism requires a non-linearity, the most important subassembly to check is one of the least linear: the power amplifier. As a result, many power amplifier test systems must incorporate provisions to measure this quantity.

Source: http://www.us.anritsu.com/downloads/files/11410-00264.pdf