Soft-normalizer for a channel decoder

Details Soft-normalizer for a channel decoder Soft-normalizer for a channel decoder

Filed on

2005-12-06

Date issued

2005-12-06

Examiner

Tse, Young T. (Department: 2637)

Patent Class

Pulse or digital communications

SubClass

Receivers

SubSubClass

Particular pulse demodulator or detector

Other Related Categories

C375S243000, C375S245000, C375S341000, C341S051000

Type

Reexamination Certificate

Status

active

Patent number

06973143

Description

ABSTRACT:
The invention proposes a device for generating, from incoming signal values (Xi,n), soft-values (Yi,n) to be input into a channel decoder of a communication device for use in a wireless communication system, comprising truncation means (24, 26, 28) for truncating the incoming signal values (Xi,n) such as to fall within a predetermined limit value range, and normalization means (30, 32) for normalizing the truncated signal values (Xti,n) such as to fit to an input range of the decoder. According to the invention, the truncation means (24, 26, 28) are adapted to determine the boundaries of the limit value range in dependence on information representative of a signal-to-noise ratio of the incoming signal values (Xi,n). The truncated signal values (Xti,n), after normalization, then are output as said soft-values (Yi,n).

REFERENCES:
patent: 5079547 (1992-01-01), Fuchigama et al.
patent: 6047035 (2000-04-01), Yellin
patent: 6081565 (2000-06-01), Marandi et al.
Lee Y K et al: “Normalization, Windowing and Quantization of Soft-Decision Viterbi Decoder Inputs in CDMA Systems” Houston, TX, May 16-20, 1999, New York, NY: IEEE, US, vol. CONF. 49, May 16, 1999, pp. 221-225, XP000899229.
Blazek Z et al: “A DSP-Based Implementation of a Turbo Decoder” Sydney, Nov. 8-12, 1998, New York, NY: IEEE, US, 1998, pp. 2751-2755, XP000801545.

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