Signal decoding methods and apparatus

Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction

Reexamination Certificate

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C714S792000

Reexamination Certificate

active

07620877

ABSTRACT:
This invention generally relates to methods, apparatus and computer program code for decoding signals, and more particularly to trellis-based decoding using a variant of a BCJR procedure. The invention includes a trellis decoder for decoding symbols of a received signal, the symbol including a sequence defined by transitions between states of a trellis, the trellis decoder including: means for performing a forward recursion through the trellis to determine a first set of probabilities (α(Xt)) each defining a probability of a said trellis state (Xt) responsive to one or more current or earlier received signal values (y1:t); means for providing a second set of (β(Xt)) probabilities each defining a probability of one or more received signal values (yt+1:T) given an earlier the trellis state (Xt); means to decode the received signal to determine probabilities (p(bt|y1:T)) for symbols of a corresponding transmitted sequence of symbols from the first and second sets of probabilities; and where the decoder further includes: means to select states for determining the first set of probabilities responsive to one or more received signal values later than a the trellis state defining a probability in said first set.

REFERENCES:
patent: 6597743 (2003-07-01), Khayrallah et al.
patent: 6901548 (2005-05-01), Hattori et al.
patent: 6947506 (2005-09-01), Mills
patent: 7010051 (2006-03-01), Murayama et al.
patent: 7190743 (2007-03-01), Learned
patent: 7236536 (2007-06-01), Hochwald et al.
patent: 7245666 (2007-07-01), Gardner et al.
patent: 7248651 (2007-07-01), Love et al.
patent: 7248849 (2007-07-01), Ariyavisitakul et al.
patent: 7308047 (2007-12-01), Sadowsky
patent: 7321644 (2008-01-01), Love et al.
patent: 7321646 (2008-01-01), Arslan et al.
patent: WO 03/075468 (2003-09-01), None
G. Colavolpe et al, “Reduced-State BCJR-Type Algorithms,” IEEE Journal on Selected Areas in Communications, vol. 19, No. 5, May 2001, pp. 848-859.
V. Franz et al, “Concatenated Decoding with a Reduced-Search BCJR Algorithm,” IEEE Journal on Selected Areas in Communications, vol. 16, No. 2, Feb. 1998, pp. 186-195.
C. Fragouli et al, “Reduced-trellis equalization using the M-BCJR algorithm,” Wireless Communications and Mobile Computing, Oct.-Dec. 2001, pp. 397-406.

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