| 摘要 |
A DAS system (10) for sending and receiving radio signals in several frequency ranges is described. The system comprises a control unit (30) with at least one first port (30-1) for forwarding first radio signals (20-1) in a first frequency range and one second port (30-2) for forwarding second radio signals (20-2) in a second frequency range. A plurality of remote units (50) are connected to the control unit (30) via a distributor network (40). The remote units (50) have first antenna elements (50-1) for sending and receiving the radio signals (20-1) in the first frequency range and second antenna elements (50-2) for sending and receiving the radio signals (20-2) in the second frequency range. The control unit (30) comprises a modulator (34) for converting the second radio signals (20-2) to a further frequency range and the remote units (50) have a demodulator (54) for converting the second radio signals (20-2) from the further frequency range to a different frequency range. |
