Military Embedded Systems

OFDM FPGA core

Product

July 26, 2010

Sharon Hess

Military Embedded Systems

Chris A. Cuifo

Editorial Director

Military Embedded Systems

OFDM FPGA core

Orthogonal Frequency Division Multiplexing (OFDM) is the core of most broadband wireless waveforms, including Wi-Fi, cellular, and other spread-spectrum implementations.

Orthogonal Frequency Division Multiplexing (OFDM) is the core of most broadband wireless waveforms, including Wi-Fi, cellular, and other spread-spectrum implementations. Available as an FPGA IP core targeting a Xilinx XC5VSX95T, the FC300 core took Sundance DSP considerable time to develop, test, and implement. Intended for use on the company’s SMT351T FPGA module and bolted to an SMT911 module, the core itself doesn’t use any off-FPGA resources and can be retargeted to any FPGA of sufficient size, including Spartan to Virtex-7, or for Altera’s Cyclone or Spartan devices. The core only assumes an external I/Q baseband DAC/ADC interface, making retargeting hardware also straightforward.

The core contains Tx and Rx chains, and for Wi-Fi, includes 802.11a/g data scrambling, forward error correction, subchannel coding (BPSK, QPSK, 16QAM, or 64QAM), pilot insertion, and IFFT/FFT algorithms. On the Rx side, there are estimators for center frequency offset and fractional sample signal timing. The core was developed for a Chinese Sundance customer and is now available to the general market.

 

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