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Hardware-Software Codesign for Software Defined Radio: IEEE 802.11p receiver case study

Software Defined Radio (SDR) platforms are useful tools to design new wireless technologies or to improve specifications of existing ones. The IEEE 802.11p is the de-facto standard for Wireless Vehicular Ad-hoc NETworks (VANETs). It has been implemented on GNU Radio SDR [1], which experiences frames decoding/encoding latency. In this paper an FPGA based SDR is proposed as a solution to accelerate frame decoding of IEEE 802.11p waveforms. We share our experience in designing and validating an SDR on the top of real FPGA based embedded hardware architecture. On the top of an FPGA Zynq platform, we port an SDR GNU Radio following hardware/software (HW/SW) codesign approach. A real time profiling of the SDR system shows that the OFDM equalizer with FFT software function is the most time consuming task of the whole SDR receiver functions (34.74%). We suggest hardware acceleration of the FFT processing function using the free logic gates of the FPGA Zynq as a Hardware (HW) accelerator. The HW OFDM Equalizer with FFT sub-function could accelerate the SDR chain processing in comparison with a pure software implementation. Our FPGA based SDR design is a key step toward proposing an embedded SDR. It would be an alternative for not only the IEEE 802.11p standard but for any OFDM based SDR.

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