Method and device for adaptive quantization of soft bits

Details Method and device for adaptive quantization of soft bits Method and device for adaptive quantization of soft bits

2005-11-15

2005-11-15

Torres, Joseph D. (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S774000, C714S794000

Reexamination Certificate

active

06966024

ABSTRACT:
A method and device for adaptive quantization of soft bits includes numerically sorting soft bits of an external data block having a log likelihood ratio distribution of the soft bits, each of the soft bits having a value, the sorted soft bits having extreme values, determining two point values in the log likelihood ratio distribution of the data block respectively located at a clipping distance away from each extreme value of the sorted soft bits, defining an adapted quantization range with a half-length equal to half of a difference between the two point values or with a half-length equal to a larger of two absolute values of the two point values, and placing each of the soft bits within a respective sub-range of the adapted quantization range. An adapted quantization range is determined whenever the log likelihood ratio distribution of the data block changes.

REFERENCES:
patent: 6347124 (2002-02-01), Antia et al.
Pilipchouk, N.I.; Asymptotic performances of DM, DPCM, ADPCM and adaptive quantizer with variable range, Information Theory Workshop, Jun. 22-26, 1998, pp.: 104-105.
Goodman, D.; Wilkinson, R.; A Robust Adaptive Quantizer, IEEE Transactions on Communications, Nov 1975, vol.: 23, Issue: 11, pp.: 1362-1365.

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