Variable length tracebacks

Details Variable length tracebacks Variable length tracebacks

1995-06-05

1996-07-16

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

371 43, H04L 2706

Patent

active

055374450

ABSTRACT:
A digital communication system including Viterbi decoder for tracing a path through a trellis of individual state information and method of operation are disclosed. The traceback determines a decoded symbol. The trellis of surviving branch data is stored in an array of registers. Operating the system includes initiating a first traceback from a storage register at a first symbol instant. The traceback traces a path back through the trellis a first predetermined number of symbol instants to determine a first decoded symbol. A second traceback is also initiated at the first symbol instant and traces a path back through the trellis a second predetermined number symbol instants to determine a second decoded symbol. The first traceback length may be greater than or less than the second traceback length. In another embodiment of the invention several tracebacks can be executed having a fixed traceback length, followed by other tracebacks having incrementally different traceback lengths. Such multiple tracebacks may be initiated in a single symbol instant. In yet another embodiment of the invention, selective ones of the decoded symbols are used by an equalizer to provide channel adaptation.

REFERENCES:
patent: 3789360 (1974-01-01), Clark, Jr. et al.
patent: 4493082 (1985-01-01), Cumberton et al.
patent: 4583078 (1986-04-01), Shenoy et al.
patent: 4748626 (1988-05-01), Wong
patent: 4797887 (1989-01-01), Yamasaki et al.
patent: 4868830 (1989-09-01), Pollara-Bozzola
patent: 4905317 (1990-02-01), Suzuki et al.
patent: 5432804 (1995-07-01), Diamondstein et al.

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