Turbo code decoding iteration cease method based on cosine similarity

A technology of cosine similarity and decoding iteration, which is applied to the iterative stop field of Turbo code decoding based on cosine similarity, can solve the problems of high complexity and high speed, and achieves the advantages of reducing the loss of bit error rate performance and improving the decoding speed. Effect

Inactive Publication Date: 2013-05-29
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

The cyclic redundancy check (CRC) criterion performs CRC check on the result of the hard decision, and the iteration stops when the result is 0; the CRC criterion has a higher speed but a higher complexity

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  • Turbo code decoding iteration cease method based on cosine similarity
  • Turbo code decoding iteration cease method based on cosine similarity
  • Turbo code decoding iteration cease method based on cosine similarity

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Embodiment Construction

[0026] The present invention will become clearer through the following description in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention.

[0027] Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements.

[0028] The turbo code decoding iterative stop method based on cosine similarity in the present invention is realized based on the Turbo code pattern in LTE / LTE-A; the channel type is an additive white Gaussian noise channel (AWGN); the modulation mode adopts a binary phase shift key control (BPSK); the decoding algorithm uses MAP decoding; the Turbo code generator polynomial is (13,15); the code rate is 1 / 3.

[0029] The flow of the iterative stop method for decoding Turbo codes based on cosine similarity in this embodiment will be described in detail below. to combine figure 1 , figure 2 , the method includes the followi...

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Abstract

The invention discloses a turbo code decoding iteration cease method based on cosine similarity. The method includes: (1) performing once iteration decoding between two component decoders, (2) storing external information sequence for decoding block, which is output by a component decoder II and defined as external information vector, (3) calculating cosine similarity between external information vectors of current iteration and last iteration, (4) comparing the cosine similarity calculated through step (3) with a preset threshold, entering step (5) if the cosine similarity is more than the threshold or the current number of iterations reaches a preset maximum and repeating step (1)-(4) if not and (5) performing de-interleaving and hard decision for log likelihood ratio which is generated by the iteration component decoder II the last time and outputting the log likelihood ratio as decoding result of the decoder. According to the method, iteration decoding speed is increased significantly during Turbo code pattern decoding of LTE (Long Term Evolution) / LET-A (Long Term Evolution-Advanced) system. A certain value is for designing high speed Turbo decoder to satisfy requirements of the LTE / LET-A system.

Description

technical field [0001] The present invention relates to LTE / LTE-A technology, relates to Turbo code high-speed decoding technology, in particular to a turbo code decoding iteration stop method based on cosine similarity. Background technique [0002] Turbo code is a channel coding technique with superior performance. The performance of Turbo codes is improved by exchanging external information between two component decoders through mutual iterative processes. The more iterations, the better the decoding performance, but at the same time, the higher the complexity, the greater the delay. Modern communication systems require higher and higher transmission rates. How to effectively reduce the decoding delay of Turbo codes and how to balance decoding performance and delay are very important research topics. [0003] Both the channel coding in the 3GPP Long Term Evolution LTE system and the LTE-A system use Turbo codes. The LTE-A system standard requires a downlink peak rate of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/27
Inventor 谭力郝斌苏钢刘云翔周泉许娅梁云龙叶露霞
Owner HUAZHONG UNIV OF SCI & TECH
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