Update block for an adaptive equalizer filter configuration capa

Details Update block for an adaptive equalizer filter configuration capa Update block for an adaptive equalizer filter configuration capa

1995-12-28

1998-09-08

Mai, Tan V.

Boots, shoes, and leggings

3647242, G06F 1710

Patent

active

058054812

ABSTRACT:
A method and apparatus are described for application to an adaptive equalizer, or filter, whereby complex valued coefficients for such an equalizer may be updated with a significant reduction in complexity as compared to prior art methods. Specifically, the method of the invention causes a sum and a difference to be determined for a real-valued and an imaginary-valued component of an input signal sample to the equalizer. Those sum and difference terms are then applied according to the method of the invention to a determination of an update term for a coefficient under consideration. Because the method of the invention results in a material reduction in the number of addition/subtraction operations required for the coefficient update process, the hardware infrastructure needed to implement that process is considerably simplified.

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patent: 5416799 (1995-05-01), Currivan et al.
Long, Guozhu, Fuyun Ling and John G. Proakis, "The LMS Algorithm with Delayed Coefficient Adaptation," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. 37, No. 9, Sep. 1989, pp. 1397-1405.
Weste, Neil H.E. and Kamran Eshraghian, Principles of CMOS VLSI Design: A Systems Perspective, Chapter 9 CMOS System Design Examles, 9.3 "A TV Echo Canceller," pp. 672-694, AT&T, U.S.A. 1993.
Lee, Edward A. Lee and David G. Messerschmitt, Digital Communication, 9.2 "Adaptive Linear Equalizer," pp. 385-394, Kluwer Academic Publishers, Boston, 1988.
Simon Haykin, Adaptive Filter Theory, Second Edition, "Stochastic Gradient-Based Algorithms," Chapter 9, pp. 299-307, Prentice Hall, Englewood Cliffs, NJ, 1988.

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