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Pre-decoder for vortex decoder and method for recovery of vortex code

A technology of pre-decoder and decoder, applied in the field of puncturing part

Inactive Publication Date: 2002-08-14
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So there is a problem that the turbo decoder has to perform many iterations to get the required decoding performance

Method used

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  • Pre-decoder for vortex decoder and method for recovery of vortex code
  • Pre-decoder for vortex decoder and method for recovery of vortex code
  • Pre-decoder for vortex decoder and method for recovery of vortex code

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Embodiment Construction

[0039] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0040] image 3 is a block diagram showing a pre-decoder for a turbo decoder according to one embodiment of the present invention. In this embodiment, as explained in the description of the prior art, an example is given in the case where a turbo code of encoding rate R=1 / 3 is punctured into a turbo code of encoding rate R=1 / 2 , specifically, an example of the case where each of the two parity bits is alternately punctured, such as (X 1 , Y 11 , Y 21 , X 2 , Y 12 , Y 22 , X 3 , Y 13 , Y 23 ,...) turbo codes are punctured into (X 1 , Y 11 , X 2 , Y 22 ,...,X N-1 , Y 1N-1 , X N , Y 2N )Case. Here, the delay between the first stream of parity symbols and the second stream of parity symbols is ignored.

[0041] The pre-decoder 100 includes: a binary encoding unit 40 for the data bit stream and each parity check symbol stream of the received turbo ...

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Abstract

A pre-decoder applied to a turbo decoder for decoding a punctured turbo code. The turbo code consists of a plurality of parity bit streams, parts of which are punctured. The pre-decoder has an arithmetic unit for calculating an estimation value of the parity bit streams by carrying out a same algorithm with respect to the data bit stream which is used by a turbo encoder to produce the parity bit streams, a comparison unit for comparing the plurality of parity bit streams with the estimation value, and a recovery unit for substituting the punctured bits of the parity bit streams for bits of the estimation values corresponding to the punctured parts when the respective bits of the parity bit streams are identical with the bits of the estimation values corresponding to the punctured parts. The punctured parity symbols are recovered by the pre-decoder completely, or at least partially, and provided to the turbo decoder. Accordingly, the decoding performance of the turbo decoder is enhanced.

Description

technical field [0001] The present invention relates to a predecoder applied to a turbo decoder, and more particularly to a method for recovering the punctured parts of a turbo code transmitted with punctured parity bits, and providing the recovered turbo code to a turbo code. Decoder's predecoder. Background technique [0002] In general, in radio digital communication, there are methods for adding error correction codes to the transmitter and correcting errors in the decoder in order to correct errors in the channel. Turbo codes are used as one of the error-correctable coding methods. For channels requiring high data rates, turbo codes are chosen in CDMA2000 in the US bound and W-CDMA in the European bound. It is well known that turbo codes are almost close to the Shannon limit, which is a theoretical limit at which iterative decoding can be performed even at low signal reception power. The decoding methods for turbo codes include the Viterbi algori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/10H03M13/00H03M13/23H03M13/29H03M13/37H03M13/41
CPCH03M13/2957H03M13/3723H03M13/37
Inventor 崔广硕金寿远
Owner SAMSUNG ELECTRONICS CO LTD
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