Ultra High Speed Digital Down Converter Design for Virtex-6 FPGAs

Konferenz: OFDM 2012 - 17th International OFDM Workshop 2012 (InOWo'12)
29.08.2012-30.08.2012 in Essen, Germany

Tagungsband: OFDM 2012

Seiten: 5Sprache: EnglischTyp: PDF

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Meyer, Joachim; Menzel, Simon; Dreschmann, Michael; Becker, Juergen (Institute for Information Processing Technologies, Karlsruhe Institute of Technology, Karlsruhe, Germany)
Schmogrow, Rene; Hillerkuss, David; Freude, Wolfgang; Leuthold, Juerg (Institute for Institute of Photonics and Quantum Electronics, Karlsruhe Institute of Technology, Karlsruhe, Germany)

This paper describes the design and optimization of an ultra- high speed Digital Down Converter (DDC) for a realization by FPGAs. After explaining the general structure of the Digital Down converter we describe in detail how to implement such a design in order to process a digital, massively parallelized signal. The necessary optimizations to achieve an efficient implementation in state of the art FPGAs are explained and a case study for an FPGA optimized Digital Down Converter design suitable for OFDMA systems is presented. The key components of this DDC are highly parallelized half-band filters which are optimized for Virtex- 6 FPGAs and enable the design to decimate a 6 bit wide input signal with a sample rate of 25 GS/s into a 16 bit 1.5625 GS/s signal while achieving an attenuation of around 35 dB. The results include the resource consumption of the DDC for a Virtex-6 XC6VHX380T FPGA as well as the filter response to a chirp test signal. Index Terms — FPGA; DDC; OFDMA; FIR; Decimator.