Active 3G Antenna Systems
Active antenna system can consist of optical repeaters, off-air repeaters, in-line amplifiers, mast head amplifiers.
Here is a small list of active UMTS antenna system manufacturers:
Decolink Wireless NEW
Tekmar BriteCell (AllenTelecom)
Wireless Valley provides measurement, design, and management software for all active and passive inbuilding wireless systems for 3G.
Most 3G network vendors can offer amplifiers and, optical and off-air repeaters. Some of those are manufactured in-house, some OEM.
Powerwave designs 3G RF power amplifiers.
3GPP TS 25.106, TS 25.113, TS 25.141 TS 25.143, TS 25.956 specifications for repeaters