A remote unit for use in a mobile communication base station system, comprising: a wireless communication unit configured to receive a signal transmitted by wireless communication from a donor unit, to convert the received signal into a Radio Frequency, RF, band signal which belongs to a frequency band for a predetermined mobile communication service, and to output the RF band signal; a service signal processor configured to receive the RF band signal output from the wireless communication unit, configured to divide the signal into a plurality of transmission channel signals, corresponding to a plurality of transmission channels corresponding to a plurality of transmission paths according to Multiple Input Multiple Output, MIMO, method, configured to convert the plurality of transmission channel signals into a plurality of RF band signals which belong to the frequency band for the predetermined mobile communication service, and configured to output the plurality of RF band signals to a base station antenna; and a synchronization and communication controller configured to extract a synchronization signal from the signal output from the wireless communication unit, and to receive a control signal, wherein the service signal processor is configured to receive a reception signal from the base station antenna, configured to divide the reception signal into a plurality of reception channel signals, configured to convert the plurality of reception channel signals into a plurality of RF band signals which belong to the frequency band for the predetermined mobile communication service, configured to shift frequencies of the RF band signals by a predetermined amount, and configured to output resultant RF band signals, where the synchronization and communication controller is configured to generate a control signal of a predetermined frequency band, and configured to provide the control signal to the donor unit, and the wireless communication unit is configured to synthesize the resultant RF band signals of the reception channels output from the service signal processor with the control signal generated from the synchronization and communication controller, is configured to convert the synthesized signal into a signal of a predetermined frequency, and configured to transmit the synthesized signal to the donor unit. a wireless communication unit configured to receive a signal transmitted by wireless communication from a donor unit, to convert the received signal into a Radio Frequency, RF, band signal which belongs to a frequency band for a predetermined mobile communication service, and to output the RF band signal; a service signal processor configured to receive the RF band signal output from the wireless communication unit, configured to divide the signal into a plurality of transmission channel signals, corresponding to a plurality of transmission channels corresponding to a plurality of transmission paths according to Multiple Input Multiple Output, MIMO, method, configured to convert the plurality of transmission channel signals into a plurality of RF band signals which belong to the frequency band for the predetermined mobile communication service, and configured to output the plurality of RF band signals to a base station antenna; and a synchronization and communication controller configured to extract a synchronization signal from the signal output from the wireless communication unit, and to receive a control signal, wherein the service signal processor is configured to receive a reception signal from the base station antenna, configured to divide the reception signal into a plurality of reception channel signals, configured to convert the plurality of reception channel signals into a plurality of RF band signals which belong to the frequency band for the predetermined mobile communication service, configured to shift frequencies of the RF band signals by a predetermined amount, and configured to output resultant RF band signals, where the synchronization and communication controller is configured to generate a control signal of a predetermined frequency band, and configured to provide the control signal to the donor unit, and the wireless communication unit is configured to synthesize the resultant RF band signals of the reception channels output from the service signal processor with the control signal generated from the synchronization and communication controller, is configured to convert the synthesized signal into a signal of a predetermined frequency, and configured to transmit the synthesized signal to the donor unit.