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CDRS devt platform rolls for W-CDMA, WiMAX

Posted: 29 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:W-CDMA? WiMAX? CDRS? Xilinx? AXIS?

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Xilinx Inc. and AXIS Network Technology have announced the immediate availability of a common digital radio system (CDRS) development platform that promise to increase power amp (PA) efficiency and reduce capital and operating costs for W-CDMA and WiMAX base stations.

The CDRSX development platform consists of the Xilinx W-CDMA and WiMAX digital front-end (DFE) reference designs and the flexible AXIS Virtex-based development board to provide a power efficient, quick time-to-market route from concept-to-production for wireless digital radio cards.

This development platform enables capital and operating cost savings by allowing base station OEMs to use lower cost, lower power PAs to reduce the operating power in the radio head. It allows developers to quickly tune the system for optimum efficiency. This provides a huge cost saving as the PA and transceiver stage consume approximately 40 percent to 60 percent of the base station's total cost.

Flexibility for OEMs
The AXIS CDRSX development platform offers OEMs the flexibility to quickly adapt to changes in specification or air interfaces. It includes a specially designed board containing RF preamps, ADCs, DACs, a Xilinx Virtex-II Pro FPGA to provide interface support for CPRI, Obsai and digital I/Q connectivity and a Xilinx Virtex-4 SX55 FPGA for implementing digital radio signal processing functions, and an operating system for control of the board via Ethernet connection.

The board has two transmit and two receive paths, plus two additional receive paths for digital pre-distortion (DPD), and it can support any 20MHz spectrum in the 400MHz to 4GHz frequency range. It's capable of driving the PA from 2-40W, while providing an effective receiver noise figure per path of 3dB. The user can set up and control the board using a GUI that enables key signal processing parameters to be displayed and adjusted quickly and easily.

"The market is looking for flexible, cost-effective solutions that can be used to develop initial systems and then go from concept-to-production as quickly and easily as possible," said Simon Mellor CEO of AXIS Network Technology.

The CDRSX development platform integrates digital up conversion (DUC), digital down conversion (DDC) and crest factor reduction (CFR) functions from Xilinx, providing an output peak to average power ratio (PAPR) of only 5.60dB for W-CDMA and a reduction of up to1.57dB for WiMAX radios. The Xilinx W-CDMA DFE includes a 3 carrier DUC, 3 carrier CFR and 6 carrier DDC. It provides 2.5W of dynamic power consumption, while consuming only 55 percent DSP48 usage in a Virtex-4 SX25 FPGA.

802.16-2004/2005 support
The Xilinx WiMAX DFE offers DUC/DDC support for 3.5/7MHz channels (IEEE802.16-2004) and 5/10MHz channels (IEEE802.16-2005); CFR and AGC are also supported. The WiMAX DFE is designed to work in UMTS clock subsystem frequencies and only consumes 39 percent DSP48 usage in a Virtex-4 SX25, for a 1-by-1 configuration.

The CDRSX development platform is available from AXIS and priced at $34,995. The Xilinx WiMAX DFE reference design is scheduled for release this quarter.

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