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Analog FFT Interface for Ultra-Low Power Analog Receiver Architectures

2. Outline. System overviewFFT structure and its circuitPerformance and simulation results. 3. OFDM communication system model. 4. . OFDMTransmission: IFFT / FFT. Transmitter: IFFT. Receiver: FFT. . 5. Symbol MappingCircularDifferentialModulator. ComplexMultiplier. Phase Offset Consideration:Differential Modulation / Demodulation.

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Analog FFT Interface for Ultra-Low Power Analog Receiver Architectures

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    1. Analog FFT Interface for Ultra-Low Power Analog Receiver Architectures Nima Sadeghi, Hessam M. Nik Christian Schlegel, Vincent C. Gaudet iCORE High Capacity Digital Communication Lab Department of Electrical & Computer Engineering University of Alberta Edmonton, Alberta, Canada

    2. 2

    3. 3 OFDM communication system model

    4. 4

    5. 5

    6. 6 FFT Structure Butterfly Diagram

    7. 7 8-bit FFT

    8. 8 Weighting factor for 8-bit FFT:

    9. 9 Modified 8-bit FFT Butterfly Diagram:

    10. 10 256 FFT Weighting Factors:

    11. 11 256-FFT

    12. 12 The circular view of the Weighting Factors on the unity circle for each FFT stage:

    13. 13 Current Mirror: Basic circuit to implement FFT

    14. 14 Simulation results for ideal, mismatch modeled, and simplified 256FFT

    15. 15 Conclusion & future work System-level integration of analog decoders Energy scavenging methods based on the power consumption advantages of analog decoders Decoder decreased the performance loss due to the circuit mismatch. Implementation of 256-FFT in CMOS technology

    16. 16 Thank you, Questions?

    17. 17 References [1] C. Winstead, Analog Iterative Error Control Decoders?, Doctor of Philosophythesis, Dept. of Elec. &Comp. Eng., Universityof Alberta, 2004. [2] J.G. Proakis, Wiley Encyclopediaof Telecommunications.,Vol. 4, John Wiley&sonsInc., NewJersey, 2003. [3] A. V. Oppenheim, R. W. Schafer andJ. R. BuckDiscrete-timesignal processing, 2nded., Prentice-Hall Inc., NewJersey, 1999. [4] S. Liu, Kramer, Indiveri, Delbruck, and Douglas. Analogvlsi:Circuits andprinciples., TheMITPress, Cambridge, Massachusetts, 2002. [5] J.G. Proakis, Digital Communications, 4thed., McGraw-Hill, NewYork, NY, 2001.

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