Method and system for automatic invariancy compensation in digit

Details Method and system for automatic invariancy compensation in digit Method and system for automatic invariancy compensation in digit

1998-02-04

2000-12-05

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375340, 375262, 375265, 714790, H03D 100, H04L 2700

Patent

active

061576832

ABSTRACT:
A method and system for compensating for code invariancies in a digital communication receiver is performed on demodulated signal data. A pre-Viterbi invariancy compensation is performed on the demodulated signal data to reverse a selected one of a number of possible transformations to create compensated signal data. The compensated signal data is then depunctured. The depunctured data is then decoded. An encoder encodes the decoded data. The encoded data and the depunctured data are then compared to determine equivalence. The pre-Viterbi invariancy compensation is performed to reverse a different one of the number of possible transformations to create the compensated signal data when the encoded data and the depunctured data are determined not to be equivalent. A post-Viterbi invariancy compensation is then performed on the decoded data to produce a set of compensated outputs. Thus, the post-Viterbi invariancy compensation reverses each one of the number of possible transformations on the decoded data. An output is then selected from between the set of compensated outputs and the decoded data in response to detection of a sync byte.

REFERENCES:
patent: 5469452 (1995-11-01), Zehavi
patent: 5848102 (1998-12-01), Zehavi et al.
patent: 5923666 (1999-07-01), Gledhill et al.
patent: 5937016 (1999-08-01), Choi
patent: 6005897 (1999-12-01), McCallister et al.

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