Non-iterative time-domain equalizer

Details Non-iterative time-domain equalizer Non-iterative time-domain equalizer

2007-03-27

2007-03-27

Patel, Jay K. (Department: 2611)

Pulse or digital communications

Equalizers

Automatic

C375S260000, C375S348000

Reexamination Certificate

active

11265322

ABSTRACT:
A method for forming a non-iterative time-domain equalizer (TEQ) and apparatus corresponding thereto. A channel response H(z) is followed by a TEQ response A(z) and a residual output B(z) is chosen so that its degree is less than a cyclic prefix. An error signal is formed so that E(z)=H(z)A(z)−B(z). With a unit input, the error signal is set to zero and B(z)=H(z)A(z). Each signal is expressed as a polynomial, having varying degrees, and a having corresponding coefficients. Once expanded, the coefficients of similar degree can be equated on both sides of the equation. The error signal can then be determined in terms of coefficients corresponding to the TEQ and the residual signal. The coefficients of the channel response can be derived from the channel training estimates. The error signal is minimized and the result is solved for in terms of the desired TEQ coefficients.

REFERENCES:
patent: 6185251 (2001-02-01), Fertner
patent: 6404806 (2002-06-01), Ginesi et al.
patent: 6834079 (2004-12-01), Strait et al.
Lee et al., Performance Evaluation of a Fast Computation Algorithm for the DMT In High-Speed Subscriber Loop, Dec. 1995, IEEE Journal on Selected Areas in Communication, vol. 13, No. 9, pp. 1564-1570.

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