Distributed antenna system for wireless network systems

A method, comprising:

• receiving, by a master unit of a distributed antenna system, downlink signals from a plurality of base stations, the downlink signals being associated with a plurality of wireless protocols and a plurality of bands, wherein receiving downlink signals from the plurality of base stations comprises receiving, by circuitry comprising a duplexer of a first radio channel, downlink signals associated with a first band of the plurality of bands from the plurality of base stations;
• outputting the downlink signals as digitized downlink signals to an extension unit over a first fiber optic cable;
• transmitting uplink signals to the plurality of base stations comprising transmitting, by the circuitry, the uplink signals associated with the first band to the plurality of base stations;
• responsive to transmitting the uplink signals associated with a second band to the plurality of base stations, opening and protecting, by switch of a second radio channel, an RF downconverter in the second radio channel;
• and
• providing, by a controller, switch control timing for controlling operation of the switch.

A distributed antenna system, comprising:

• a master unit configured for sending uplink signals to a plurality of base stations, the uplink signals being associated with a plurality of wireless protocols and a plurality of bands, wherein the master unit is configured for receiving the uplink signals as digitized uplink signals from an extension unit over a first fiber optic cable;
• a first remote unit configured to generate first digitized uplink signals by digitizing first RF uplink signals wirelessly received by the first remote unit, the first remote unit being configured to provide the first digitized uplink signals to the extension unit, the first remote unit comprising:
• a digital to analog converter;
• and
• a digital pre-distortion unit, the digital pre-distortion unit configured to compare the first digitized uplink signals to a delayed downlink signal, wherein the remote unit is configured to, based on a difference from the comparison in the digital pre-distortion unit, automatically adjust a gain and phase of a signal prior to conversion in the digital to analog converter;
• and
• a second remote unit configured to generate second digitized uplink signals by digitizing second RF uplink signals wirelessly received by the second remote unit, the second remote unit being configured to provide the second digitized uplink signals to the extension unit,
• the extension unit configured to generate the digitized uplink signals by summing the first digitized uplink signals and the second digitized uplink signals.