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FPGA Implementation of an OFDM Modem

Explore why OFDM is essential for digital communication, the benefits it offers, and how FPGA enables rapid Wi-Fi implementation compared to DSP technology. Learn about efficient FFT implementation through CORDIC, with future enhancements for error correction and new modulation techniques.

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FPGA Implementation of an OFDM Modem

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  1. FPGA Implementation of an OFDM Modem Tonny M. Siqueira and Evandro O. T. Salles • Why OFDM (Orthogonal Frequency Division Multiplexing)? • Fully digital modulation • ~50% bandwidth reduction • Multipath robustness and ease channel equalization • Applications: Digital TV, ADSL, VDSL, PLCC, Wi-Fi, UWB • Why FPGA? • Rapid prototype design flow • FPGA vs. DSP for Wi-Fi implementation • Wi-Fi needs 15 GOPS • Texas Instruments C64x DSP less than 5 GOPS • Virtex can supportup to 20 GOPS Laboratório de Telecomunicações Departamento de Engenharia Elétrica Universidade Federal do Espírito Santo

  2. Spectral Compression Orthogonality between subcarriers f OFDM System Transmitter OFDM Spectrum Receiver

  3. Our approach to OFDM system Implemented through CORDIC (Coordinate Rotation Digital Computer) Efficient and flexible FFT implementation RTL Controller Circuits optimized for 64-point FFT (i.e. up to 31 subcarriers)

  4. Coregen Our approach Design improvements

  5. FPGA utilization(Final design - Spartan IIE) Modem capacity: 12 bit / 64 point FFT, up to 14.3Mbps at 50 MHz clock. Future Work: Synchronization, Error Corrections (TCM, Interleaving, Turbo Coding), Other basis different from DFT (ELT – Extended Lapped Transform, WPM – Wavelets Packets Modulation).

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