Patent ID: 8082006
Filing Date: 2011-12-20
Classification: H04B,H04W

Abstract:
1. A base station comprising: an antenna; a receiver which receives a signal from a terminal through the antenna; and a control section which is connected with the receiver to judge normality of the receiver, wherein the receiver has: a first switch section which switches whether an input port of the receiver is to be connected with the antenna or terminated; a low-noise amplifier which amplifies a signal input from the input port of the receiver with a low distortion; a second switch section that switches a signal path of the receiver between a first path which runs through the low-noise amplifier and a second path which does not run through the low-noise amplifier; an amplifier which amplifies signals from the first path and the second path with a predetermined gain; and an automatic gain control amplifier which controls the gain in such a manner that an output thereof becomes constant, and amplifies an output from the amplifier with the controlled gain, and the control section performs: terminating the input port of the receiver by using the first switch section to input thermal noise to the low-noise amplifier; switching the second switch section to acquire a first gain of the automatic gain control amplifier when connected to the first path and a second gain of the automatic gain control amplifier when connected to the second path, respectively; and determining normality of the receiver based on the fact that the acquired first and second gains respectively fall within a predetermined first range and second range and a difference between the acquired first and second gains falls within a predetermined third range; wherein the first and second range are determined based on an expected value and a predetermined allowable range, the expected value being based on a thermal noise power determined depending on a reception band width and a temperature, and a total gain and a total noise figure in a section between an input port of the receiver and an input port of the automatic gain control amplifier when connected to the first and second path, respectively.