Axis Network Technology Launches High-power WiMAX Remote Radio Heads

(Product News, 25 Aug 2008)

Axis Network Technology (AxisNT) has launched a family of MIMO Remote Radio Heads (RRH) for OEM deployment of WiMAX networks worldwide. The RRHs are available for both 2.5GHz and 3.5GHz networks, and can be customised to meet the specific interface and packaging requirements of the OEM. Designing WiMAX basestations using a distributed RRH approach with highly efficient digital-to-RF conversion and amplification considerably reduces both CAPEX and OPEX of the overall system as well as maintenance costs. The use of an RRH allows the radio to be located alongside the antennas and physically separate from the basestation (BTS), removing the losses associated with long cable runs by replacing them with an optical fibre data interface. The AxisNT RRH presents flexible multi-gigabit BTS connections, communicating via OBSAI, CPRI or custom OEM fibre interfaces.

Axis RRH models are available for use in the 2.3GHz to 2.7GHz and 3.3GHz to 3.8GHz spectrum bands, and Axis radios are configurable for frequencies between 400MHz and 4GHz. Each of the models offers dual channel operation for MIMO, to comply with WiMAX and IEEE 802.16 d/e standards. They are also capable of 4-channel MIMO operation using 2-channel units driven separately from OBSAI/CPRI or daisy chained. Channel bandwidth is variable between 3.5MHz and 20MHz for TDD or FDD air interfaces.

Employing high efficiency advanced power amplifier technologies, the RRH units are available in several options with downlink output power levels of up to 28W. The advanced power amplifier design features include PowerDPD Digital Pre-Distortion, digitally controlled Doherty amplifiers and flexible wideband crest factor reduction (CFR). The RRH also feature automatic calibration of transmit, receive and PA bias control loops, and are fitted with OBSAI RP3-01 or CPRI V2 digital baseband interfaces with either one or two optical connectors as required. They integrate an AxisIPR configurable IP radio processor, along with an AxisOS remote management and local craft interfaces. Support for Adaptive Antenna Systems (AAS) and AISG v2.0 antenna control is provided.

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