By Topic

Low-Power Discrete Fourier Transform for OFDM: A Programmable Analog Approach

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

5 Author(s)
Sangwook Suh ; Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA ; Basu, A. ; Schlottmann, C. ; Hasler, P.E.
more authors

The modulation and demodulation blocks in an orthogonal frequency-division multiplexing (OFDM) system are typically implemented digitally using a fast Fourier transform circuit. We propose an analog implementation of an OFDM demodulator as a means for reducing power consumption. The proposed receiver implements the discrete Fourier transform (DFT) as a vector-matrix multiplier using floating-gate transistors on a field-programmable analog array (FPAA). The DFT coefficients can be tuned to counteract an inherent device mismatch by adjusting the amount of electrical charge stored in the floating-gate transistors. When compared to a digital field-programmable gate array implementation, the analog FPAA implementation of the DFT reduces power consumption at the cost of a slight performance degradation. Considering the errors in the DFT coefficients as intersymbol interference, the performance degradation can be further mitigated by employing a least mean-square or minimum mean-square-error equalizer.

Published in:

Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:58 ,  Issue: 2 )