Embodiments of the present invention relate to the field of communications technologies, and disclose a radio remote unit, a receiver, and a base station, to reduce a quantity of receive channels, so that a volume of a receiver is reduced, a base station is miniaturized, and costs for deploying the receive channels may be reduced. A specific solution is as follows: The radio remote unit includes at least one receive channel pair, a first local oscillator module, a second local oscillator module, a local oscillator switching switch, and a controller, where each receive channel pair includes a first receive channel and a second receive channel; each receive channel in each receive channel pair includes a filtering module, a frequency mixing module connected to the filtering module, and a digital processing module connected to the frequency mixing module, where a frequency mixing module on the first receive channel is connected to the first local oscillator module, and a frequency mixing module on the second receive channel is connected to the first local oscillator module and the second local oscillator module by using the local oscillator switching switch; and the controller is configured to receive an operating mode that is sent by a base station, and control the local oscillator switching switch to perform switching.