Abstract: An example system is configured to measure power based on a first signal in a first frequency band. The first signal includes an interference component of a second signal in a second frequency band that is adjacent to the first frequency band. The system includes a lowpass filter (LPF) having a fixed frequency. The system includes circuitry configured to perform operations that include changing a frequency using a local oscillator to shift a center frequency of the first signal into an LPF; obtaining measurements of power of the interference component at windows in the first frequency band where an attenuation of the LPF is at or above a predefined value; and determining the power of the interference component in the first frequency band based on the measurements so as to reduce an aliasing component in the first signal caused by the LPF.