Decoding device and decoding method

Abstract

A decoding device and decoding method for carrying out repetitive decoding appropriate times so as to ensure a desired transmission quality and to reduce operation delay. A turbo decoder (301) repeats an error-correction decoding of an inputted code sequence. An error detector (302) decodes an error detection code included in the result of the error correction decoding and detects an error, if any, remaining in the result of the decoding by the turbo decoder (301). A repetition controller (303) orders a repetitive decoding until the repetitive decoding is repeated repetition restriction times and until the error detector (302) detects no error in the result of the decoding.

Description

technical field [0001] The present invention relates to a decoding device and a decoding method for repeatedly decoding a code sequence obtained by performing error detection coding and error correction coding on information bits, and particularly relates to a code sequence subjected to error correction coding by a turbo code A decoding device and a decoding method for decoding. Background technique [0002] In the field of mobile communications, techniques for detecting and correcting errors occurring on channels due to noise or the like are being actively studied. In digital communication in particular, error control techniques for correcting errors that have not been fully recovered by signal processing such as equalization or diversity are widely used. This error control technique is broadly classified into automatic repeat request (ARQ; Automatic Repeat reQuest) and forward error correction (FEC; Forward Error Correction). ARQ is a technology...

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Problems solved by technology

[0009] However, in order to obtain high transmission quality in the above-mentioned Turbo decoding, a considerable amount of repetitive processing is required, so if Turbo coding / Turbo decoding is applied to a communication system requiring high transmission quality, there is the following problem: as the number of repetitions increases, Processing latency and power consumption also increase

[0010] However, in the technology disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2000-183758, there is the following problem: in the case where an error cannot be detected although an error remains in the decoding result (when an undetected error occurs), the Repeated decoding is completed with errors still remaining in the decoded result, degrading the transmission quality

However, in this technique using a plurality of error detection codes, there is a problem that although the risk of deterioration in transmission quality due to missed detection errors is reduced, repeated decoding is continued until all codes contained in the error correction codes are corrected. The error detection codes are all judged as error-free, so the number of repetitions increases, processing delays and power consumption increase

That is, in the method of repeating the decoding a predetermined number of times, there is a problem that the finally obtained decoding result is not necessarily the decoding result with the fewest errors, and since unnecessary error correction decoding is repeatedly performed, the processing delay increases and the power consumption increases. Increase

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