The invention discloses a single-antenna RRU (remote
radio unit) comprising one or a plurality of radio-frequency far ends and an IR
processing unit, wherein each radio-frequency far end is connected with an antenna, a received uplink analog radio-frequency
signal is processed into an uplink digital intermediate-frequency
signal, the uplink digital intermediate-frequency
signal is transmitted to the IR
processing unit, a downlink digital intermediate-frequency signal from the IR
processing unit is received and is processed into a downlink analog radio-frequency signal, and the downlink analogradio-frequency signal is transmitted to the antenna. Simple protocol transmission is adopted between the radio-frequency far ends and the IR processing unit. The IR processing unit processes the uplink digital intermediate-frequency signal from each radio-frequency far end into an uplink digital
baseband signal, the uplink digital
baseband signal is transmitted to a BBU, a downlink digital
baseband signal from the BBU is processed into a downlink digital intermediate-frequency signal, and the downlink digital intermediate-frequency signal is transmitted by selecting one of all the radio-frequency far ends. By adopting the single-antenna RRU, a plurality of radio-frequency far ends can be adopted to carry out coverage, so that the transmission capacity of the RRU can be expanded.