Turbo decoder with multiple scale selections

Details Turbo decoder with multiple scale selections Turbo decoder with multiple scale selections

2005-04-26

2005-04-26

Le, Amanda T. (Department: 2634)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C714S755000, C714S780000, C714S794000

Reexamination Certificate

active

06885711

ABSTRACT:
Techniques to improve the performance of a Turbo decoder when scale information for the bits in a code segment to be decoded is not known. A number of hypotheses are formed for the code segment, with each hypothesis corresponding to a particular set of one or more values for a set of one or more parameters used for decoding the code segment. For the MAP decoding scheme, these parameters may be for the sequence of scaling factors used to scale the bits prior to decoding and/or a scale used to evaluate a (e.g., min*) function for the MAP decoding. The code segment is decoded based on the MAP decoding scheme and in accordance with each hypothesis. The quality of the decoded result for each hypothesis is determined based on one or more performance metrics. The decoded bits for the best hypothesis are provided as the Turbo decoder output.

REFERENCES:
patent: 6175590 (2001-01-01), Stein
patent: 6393076 (2002-05-01), Dinc et al.
patent: 20020131532 (2002-09-01), Chi et al.
Yufei Wu et al: “The Influence Of Quantization And Fixed Point Arithmetic Upon The BER Performance Of Turbo Codes”, Vehicular Technology Conference, 1999 IEEE 49thHouston, TX, May 16, 1999, pp. 1683-1687.
Czaja S et al: “Variable Data Rate Viterbi Decoder With Modified LOVA Algorithm”, Microelectronics and VLSI, 1995. Tencon '95, IEEE Region 10 International Conference of Hong Kong, Nov. 6, 1995, pp. 472-475.
Pietrobon S. S: “Implementation And Performance Of A Turbo/Map Decoder”, International Journal Of Satellite Communications, John Wiley and Sons, US., vol. 16, No. 1, 1998, pp. 23-46, XP000856961.

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