US Patent 6954492 Method of differential encoding a precoded multiple modulus encoder
Patent 6954492 was granted and assigned to 3Com on October, 2005 by the United States Patent and Trademark Office.
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Patent abstract
A differential encoder is designed to correct for any phase invariance. Without differential encoding defined for the V.92 upstream, undetectable errors are possible in a modem due to an inversion in the upstream channel. Immunity to channel inversions is provided by differentially encoding a combined preceding and modulus conversion system. A frame of a constellations is attributed a sign and the frame and the sign are differentially encoded. The frame and the sign are differentially decoded after the multiple modulus decoder, ensuring phase shift immunity.
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Patent Inventor Names
Richard G. C. Williams0
Date of Patent
October 11, 2005
0Patent Application Number
095518890
Date Filed
April 19, 2000
0Patent Primary Examiner
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US Patent 6954492 Method of differential encoding a precoded multiple modulus encoder
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