Block decoding with soft output information

Details Block decoding with soft output information Block decoding with soft output information

1997-06-10

1999-07-27

Moise, Emmanuel L.

Excavating

371 3703, 371 3706, 371 3709, 371 436, 375262, 375341, H03M 1300

Patent

active

059302720

ABSTRACT:
A method for decoding a linear block code of information bits transmitted across a signal channel, comprising the steps of:
a) receiving the transmitted signals from the channel and converting the received signals into a number of received vectors r with each received vector having a length of n; and for each vector r,
b) performing hard decisions on r to produce a hard decision data vector b and a corresponding reliability information vector a and performing hard decision decoding on b to produce an error pattern e, and further converting each vector b into a center code word; the vector a and the center code word each having a length n;
c) identifying a set of j=0 to p nearby code words including the center code word;
d) determining, for each nearby code word a difference metric DM.sub.j, wherein each difference metric DM.sub.j is defined by the following relationship:

REFERENCES:
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patent: 5208816 (1993-05-01), Seshardi et al.
patent: 5319649 (1994-06-01), Raghavan et al.
patent: 5537444 (1996-07-01), Nill et al.
Thesis of William H. Thesling entitled "Efficient Block Decoding Algorithms Exploiting Channel Measurement Information," Cleveland State University, Dec. 1995.
David F. Freeman et al. "A Two-Dimensional Product Code with Robust Soft-Decision Decoding," IEEE Transactions On Communications, vol. 44, No. 10, Oct. 1996, pp. 1222-1226.

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