A method comprising: receiving a first broadband uplink signal from a first remote unit of a distributed antenna system and a second broadband uplink signal from a second remote unit of the distributed antenna system, wherein a broadband uplink signal comprises: a signal transmitted over a channel having a sufficiently wide bandwidth such that the signal does not have a flat or substantially flat frequency response; or a signal that includes uplink transmissions from multiple terminal devices; dividing the first broadband uplink signal into a first plurality of narrowband uplink signals and the second broadband uplink signal into a second plurality of narrowband uplink signals, wherein a narrowband signal comprises a signal transmitted over a channel having a sufficiently narrow bandwidth such that the signal has a flat or substantially flat frequency response; identifying a mapping of the first plurality of narrowband uplink signals and the second plurality of narrowband uplink signals to an antenna port (102, 103) of a base station; selecting a first subset of narrowband uplink signals from the first plurality of narrowband uplink signals and a second subset of narrowband uplink signals from the second plurality of narrowband uplink signals based on the first subset of narrowband uplink signals and the second subset of narrowband uplink signals having signal powers above a threshold signal power, wherein the first subset of narrowband uplink signals and the second subset of narrowband uplink signals are also selected based on the mapping associating the first plurality of narrowband uplink signals and the second plurality of narrowband uplink signals with the antenna port (102, 103); and combining the selected first and second subsets of narrowband uplink signals for routing to the base station, wherein combining the selected first and second subsets of narrowband uplink signals comprises excluding narrowband uplink signals outside the selected first and second subsets of narrowband uplink signals from the combining operation. receiving a first broadband uplink signal from a first remote unit of a distributed antenna system and a second broadband uplink signal from a second remote unit of the distributed antenna system, wherein a broadband uplink signal comprises: a signal transmitted over a channel having a sufficiently wide bandwidth such that the signal does not have a flat or substantially flat frequency response; or a signal that includes uplink transmissions from multiple terminal devices; dividing the first broadband uplink signal into a first plurality of narrowband uplink signals and the second broadband uplink signal into a second plurality of narrowband uplink signals, wherein a narrowband signal comprises a signal transmitted over a channel having a sufficiently narrow bandwidth such that the signal has a flat or substantially flat frequency response; identifying a mapping of the first plurality of narrowband uplink signals and the second plurality of narrowband uplink signals to an antenna port (102, 103) of a base station; selecting a first subset of narrowband uplink signals from the first plurality of narrowband uplink signals and a second subset of narrowband uplink signals from the second plurality of narrowband uplink signals based on the first subset of narrowband uplink signals and the second subset of narrowband uplink signals having signal powers above a threshold signal power, wherein the first subset of narrowband uplink signals and the second subset of narrowband uplink signals are also selected based on the mapping associating the first plurality of narrowband uplink signals and the second plurality of narrowband uplink signals with the antenna port (102, 103); and combining the selected first and second subsets of narrowband uplink signals for routing to the base station, wherein combining the selected first and second subsets of narrowband uplink signals comprises excluding narrowband uplink signals outside the selected first and second subsets of narrowband uplink signals from the combining operation.