Method and system for processing a signal

Pulse or digital communications – Receivers – Interference or noise reduction

Reexamination Certificate

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C375S324000, C375S329000

Reexamination Certificate

active

07120210

ABSTRACT:
A clipped metric function is utilized to mitigate the adverse effects of impulsive noise (e.g., lightening, motor vehicle ignition noise) on communications signals. The clipped metric function may be used alone or in conjunction with conventional signal clipping. In one embodiment, a clipped Euclidean metric function is determined as a function of the input signal. The input signal is processed in accordance with the clipped Euclidean metric function, to provide a clipped metric signal. The clipped metric signal is processed in accordance with application dependent requirements. The clipped metric function provides improved performance over conventional signal clipping. For example, utilization of a clipped metric function provides improved performance in situations in which the impulsive noise does not increase the amplitude of the input signal to a level that would be clipped by signal clipping.

REFERENCES:
patent: 5088113 (1992-02-01), Wei
patent: 6330702 (2001-12-01), King
patent: 6343105 (2002-01-01), Saegusa
patent: 6523147 (2003-02-01), Kroeger et al.
A. Lapidoth et al. Reliable Communication Under Channel Uncertainty IEEE Transactions on Information Theory, vol. 44, No. 6 Oct. 1998.
Clark et al., Error-Correction Coding for Digital Communications Plenum Press, 1981, pp. 26-27.

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