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US 6,526,539 B1Granted
Turbo decoder
AssigneeFujitsu Limited
InventorsTetsuya Yano, Kazuhisa Obuchi, Kazuo Kawabata
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Abstract
A turbo decoder is provided in which a distribution of likelihood values that are obtained during the course of turbo-decoding is watched and scaling of an operation object to be subjected to subsequent likelihood computation of the turbo-decoding is performed in accordance with the distribution. This turbo decoder can reduce the cost, size, and power consumption of a transmission system and equipment, increase their reliability, and improve the transmission quality and performance.
Claims54
A turbo decoder comprising:
- a decoding means for turbo-decoding on a received sequence on a code block basis, by restoring transmission information represented by the received sequence;
- a range watching means for obtaining a distribution of likelihood values that are obtained during the course of the turbo-decoding performed by said decoding means;
- and
- a scaling means for determining a scaling that will suppress the variation in a distribution of likelihood values obtained as a result of a subsequent operation, to be a scaling for an object of said subsequent operation performed under the distribution obtained by the range watching means, where said subsequent operation is performed for said decoding means to complete the turbo-decoding for a common code block,
- wherein said decoding means applies the scaling determined by said scaling means to the object of said subsequent operation.
2 more elements
Dependencies are inferred from the claim text.