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Abstract

An apparatus and method for measuring power of carrier channel in question and power leaked from an adjacent channel (leakage power) of a transmitter, and calculating a ratio between the leakage power and the carrier power in the time domain using a digital signal processing technique. The power measurement apparatus includes a frequency mixer which receives a signal from a transmission channel in consideration, an A/D converter for converting an output of the frequency mixer to a digital signal, a Hilbert converter for converting the digital signal into a complex signal, a low pass filter for removing low frequency components from the output signal of the Hilbert converter, a bandpass filter for separating the output of the low pass filter into the carrier power and the leakage power, and a power processing unit for computing the ratio between the leakage power and the carrier power.

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