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Turbo decoder and turbo decoding method

一种译码装置、译码的技术，应用在加速译码方式的改良领域，能够解决译码错误集中、无法减少译码处理时间等问题，达到实现译码处理、改善译码性能、高速化译码处理的效果

Inactive Publication Date: 2005-07-27
NEC CORP
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  • Application Information

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Problems solved by technology

[0044] In the technique of Non-Patent Document 1, memory can be greatly saved, but in this decoding device, processing is performed in order of each window, so there is a disadvantage that the overall decoding processing time cannot be reduced.
In addition, in the technology of Non-Patent Document 2, all Alpha and Beta are 0, so the concentration of decoding errors at the boundary portion caused by the division becomes a problem.

Method used

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  • Turbo decoder and turbo decoding method
  • Turbo decoder and turbo decoding method
  • Turbo decoder and turbo decoding method

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Embodiment Construction

[0063] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 is a schematic block diagram of an embodiment of the present invention. In the present invention, it is considered to divide a code block of length NW (N, W is an integer greater than 2) into N sub-code blocks #1-#4 of equal length W, and decode each sub-code block in parallel. In this example, if figure 1 As shown, it will be described as an example where N=4.

[0064] The organizational information 2 (Systematic information), the redundant information 3 (Parity Information) output from the accelerated decoding input buffer 1, and the external information 14 (External information) obtained in the last decoding in repetition are divided into the first ~4th sub-code block #1~#4, and input to each sub-accelerated decoder. The sub-accelerated decoder for decoding the first sub-code block #1 is composed of a pre-initial value processing block 4 and an external v...

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Abstract

The invention provides a turbo decoding method.The turbo encoded data is divided into first to N-th (N is an integer of >=2) subcode data which are in turn decoded in parallel, pre-initialization means 4-7 (when N=4) where an initial value for calculating the forward path metric of second and subsequent subcode blocks is set as the final stage operation value in the prestage subcode block, and an initial value for calculating the backward path metric of (N-1)th and preceding subcode blocks is set as the final stage operation value in the poststage subcode block are provided. After the pre-initialization of path metric values, external value calculating / hard judging blocks 8-11 decode respective subcode blocks in parallel.

Description

technical field [0001] The present invention relates to an accelerated decoding device (turbo decoding device) and its method, in particular to a high-performance and high-reliability accelerated decoding device (turbo code) used in the field of communication systems and information processing systems Decoding method (turbo decoding method) improvement. Background technique [0002] In recent years, according to C.Berrou et al., there is a so-called accelerated code (Turbo code) method as an error correction code close to Shannon's limit, and it is used as a method in a wide range of communication fields including mobile communication systems, information recording systems, digital broadcasting systems, and the like. High-performance, high-reliability coding methods used in the information processing field are being researched and developed. [0003] Here, a general turbo encoder (turbo encoder) and turbo decoder (turbo decoder) will be described first. Image 6 with Figu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/13H03M13/29H03M13/39H03M13/41H03M13/45
CPCH03M13/2957H03M13/3723H03M13/3972H03M13/3905
Inventor 林华
Owner NEC CORP
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