Method and apparatus for differentially decoding signals

Details Method and apparatus for differentially decoding signals Method and apparatus for differentially decoding signals

1996-10-23

1998-09-29

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

With error detection or correction

371 35, H04L 27233

Patent

active

058150994

ABSTRACT:
The present invention relates to a method and apparatus in which a differentially coded signal having forward error correction added to the encoded data can be decoded with an improved bit error rate performance
Apparatus for decoding a differentially encoded input signal having forward error correction added to the encoded data, the apparatus comprising: a differential decoder to receive the input signal and to decode the data in each differentially encoded signal interval thereof by reference to the data in a previous differentially encoded signal interval; error correcting means to correct errors in the decoded signal form the decoder; and means for supplying to the decoder the corrected data from each signal interval to act as a reference for decoding the data in a following signal interval.

REFERENCES:
patent: 4567591 (1986-01-01), Gray et al.
patent: 4660196 (1987-04-01), Gray et al.
CD3-OFDM: A New Channel Estimation Method to Improve the Spectrum Efficiency in Digital Terrestrial Television Systems. Mignone et al.; pp. 122-128; Sep. 1995; ISBN 0-85296-644-x ;UK.
V. Mignone, et al., IBC, A New Channel Estimation Method to Improve the Spectrum Efficiency in Digital Terrestrial Television Systems, 95 International Broadcasting Convention, CD3-OFDM, abstract, Conference Publication No. 413, Sep. 1995, pp. 122-128.
F. Adachi, Reduced-state Viterbi Differential Detection Using a Recursively Estimated Phase Reference For M-ary DPSK, IEE Communications, col. 142, No. 4, Aug. 1995, pp. 263-270.

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