Patent ID: 8280442

Claim:
A radio base station comprising: a receiver for amplifying a signal having a plurality of frequencies and outputting a signal which includes a fundamental wave component of the signal and a intermodulation distortion component caused by intermodulation of the signal; a signal oscillation source for generating at least two test signals having a predetermined frequency interval; a test signal transmitter for adjusting the electric power of the test signals generated by the signal oscillation source to a predetermined input electric power to the receiver and outputting the adjusted test signals to the receiver; a signal processing section for receiving the test signals generated by the signal oscillation source and amplified by the receiver and obtaining electric power of a fundamental wave component and electric power of an intermodulation distortion component of received test signals; and a control section for determining whether the receiver works normally or an intermodulation error occurs, wherein the signal processing section calculates a gain of the receiver from obtained electric power of the fundamental wave component and the predetermined input electric power and, the control section determines whether the calculated gain falls within a first predetermined allowable range to determine whether the receiver works normally or a gain error occurs, further wherein the signal processing section calculates an index for the intermodulation distortion characteristics of the receiver by the following expression from the electric power of the obtained intermodulation distortion component, the calculated gain, and the predetermined input electric power the index=3×(input electric power)+gain−(electric power of intermodulation distortion component); and the control section determines whether the index for the intermodulation distortion characteristics falls within a second predetermined allowable range to determine whether the receiver works normally or an intermodulation error occurs.