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116 Chapter 8
802.16 OFDMA Measurement Application
Measurement Specifications
e. To meet this specified accuracy when measuring base station (BS) at −45 dBc ACPR, the mixer level
(ML) must be optimized for accuracy. This optimum mixer level is −18 dBm, so the input attenuation
must be set as close as possible to the average input power. For example, if the average input power is
−2 dBm, set the attenuation to 16 dB. This specification applies for the normal 10 dB peak-to-average
ratio (at 0.01
% probability). Note that if the mixer level is set to optimize dynamic range instead of
accuracy, accuracy errors are nominally doubled.