Proc. IEEE Int. Conf. on
Acoustics, Speech, and Signal Proc.,
vol. 5, pp. 37-40, May 17-21, 2004, Montreal, Canada.
Wordlength Optimization with Complexity-And-Distortion Measure
and Its Applications to Broadband Wireless Demodulator Design
Brian L. Evans
Wireless Networking and
The University of Texas at Austin,
Austin, TX 78712 USA
Draft of Paper -
Lecture Slides -
Many digital signal processing algorithms are first developed in
floating point and later mapped into fixed point for digital
hardware implementation. During this mapping, wordlengths are
searched to minimize total hardware cost and maximize system
performance. Complexity and distortion measures have been
separately researched for optimum wordlength selection. This
paper proposes a complexity-and-distortion measure (CDM) method
that combines these two measures. The CDM method trades off these
two measures using a weighting factor. The proposed method is
applied to wordlength design of a fixed broadband wireless
demodulator. For this case study, the proposed method finds the
optimal solution in one-third the time that exhaustive search
takes. The contributions of this paper are
- a generalization of search methods based on complexity or
- a framework of automatic wordlength optimization, and
- a wireless demodulator case study.
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Last Updated 10/24/03.