Method and apparatus for hybrid decision feedback equalization

Pulse or digital communications – Equalizers – Automatic

Reexamination Certificate

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C375S222000, C375S229000, C375S235000

Reexamination Certificate

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07046726

ABSTRACT:
A method and apparatus for a decision feedback equalizer wherein a correction term is used to compensate for slicer errors, thus avoiding error propagation. Filter coefficients for the equalizer are selected so as to minimize a cost function for the equalizer. The cost function calculation includes a correction term. The correction term is a function of the energy of the filter coefficients. In one embodiment, the cost function includes a Mean Squared Error (MSE) calculation. The equalizer includes a coefficient generator responsive to the correction term. The correction term may depend on the Signal-to-Interference-and-Noise Ratio (SINR) at the output of the equalizer.

REFERENCES:
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patent: 6792040 (2004-09-01), Davis et al.
patent: 2004/0013189 (2004-01-01), Jayaraman et al.
Jayaraman et al., “Hybrid Decision Feedback Equalization,” 2003 International Conference On Communications, vol. 4, Anchorage, AK, May 11, 2003, pp. 2380-2384.
Bednarz et al., “Decision Feedback Equalization for Channels with Error Correcting Capabilities,” IEEE International Conference on Montreal, Quebec, Canada, Jun. 8, 1997, pp. 1607-1612.
Kennedy et al., “Quantizer Design and Optimization in Decision Feedback Equalization,” Fourth International Symposium on Signal Processing and Its Applications, vol. 2, Aug. 25, 1996, pp. 614-617.
Marco Chiani, “Introducing Erasures in Decision-Feedback Equalization to Reduce Error Propagation,” IEEE Transactions On Communications, vol. 45, No. 7, New York, U.S.A., Jul. 1, 1997, pp. 757-760.
Ariyavisitakul et al., “Joint Coding and Decision Feedback Equalization for Broadband Wireless Channels,” Vehicular Technology Conference, 48thIEEE, Ottawa, Canada, May 18, 1998, pp. 2256-2261.

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