Space-efficient turbo decoder

H - Electricity – 03 – M

Patent

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Details

H03M 13/00 (2006.01) H03M 13/29 (2006.01)

Patent

CA 2427153

An efficient turbo decoder. The disclosed turbo decoder includes a first mode of operation in which the turbo decoder uses a first functional loop. The first functional loop includes a memory bank, a read interleaver, a first multiplexer (MUX), a RAM file, a log-MAP decoder, a write interleaver, and a second MUX. The disclosed turbo decoder further includes a second mode of operation in which a second functional loop is used. The second functional loop includes the memory bank, the first MUX, the RAM file, the log-MAP decoder, and the second MUX. The memory bank is a dual port extrinsic memory. The disclosed turbo decoder circuit switches between the first mode and the second mode. Also provides a method of turbo encoding and an apparatus for turbo encoding.

Cette invention concerne un décodeur turbo efficace. Ledit décodeur turbo comprend un premier mode de fonctionnement, au cours duquel ce décodeur utilise une première boucle fonctionnelle. Ladite première boucle fonctionnelle comprend une banque de mémoire, un entrelaceur de lecture, un premier multiplexeur (MUX), un fichier RAM, un décodeur log-MAP, un entrelaceur d'écriture et un second multiplexeur. Ce décodeur turbo comporte également un second mode de fonctionnement, durant lequel une seconde boucle fonctionnelle est utilisée. Celle-ci contient la banque de mémoire, le premier multiplexeur (MUX), le fichier RAM, le décodeur log-Map, et le second multiplexeur (MUX). Ladite banque de mémoire est une mémoire extrinsèque à port dual. Ce circuit de décodeur turbo effectue des commutations entre les premier et second modes.

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