Error correction encoder, error correction decoder, and communic

Details Error correction encoder, error correction decoder, and communic Error correction encoder, error correction decoder, and communic

1997-06-17

1999-07-13

Elmore, Reba I.

Excavating

371 3702, 371 377, 371 3708, 371 437, 370317, 370326, 39518505, 39520077, H03M 1300

Patent

active

059236795

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to an error correction encoder, error correction decoder and communication system, for example, comprising further improvements to the transmission quality when applied to a system communicating via a transmission path with inferior transmission path characteristics.


BACKGROUND ART

In the field of information transmission, error correction decoding is generally used in order to reduce the influence of errors occurring in a transmission path as much as possible, and to carry out highly reliable information transmission. This error correction decoding controls errors by appending redundancy code to the information code. In an actual signal transmission system, because the amount of redundancy code that can be appended is limited by such factors as the scale of the hardware etc., in the case where transmission data errors have occurred exceeding the error correcting capability possessed by redundancy code, erroneous data will be received. To cope with this type of situation, a method has been adopted where error detection codes such as CRC (Cyclic redundancy check) are appended to information that is not permitted to have transmission errors, and the existence of uncorrectable transmission errors is detected at the receive signal side.
However, an inferior transmission path, such as is often the case in radio communication, the possibility of the occurrence of transmission errors beyond the correction capability possessed by the code is comparatively high, and there is a need for more powerful error correction codes. On the other hand, in order to improve the error correcting capability it is generally necessary to increase the redundancy code included in the code, but this is not possible in a signal transmission system in which the transmission efficiency can not be sacrificed.


SUMMARY OF THE INVENTION

Accordingly, an object of the invention is to provide an error correction encoder, error correction decoder and communication system that can improve error detection and error correction capability in the transmission of extremely important information or signals (for example, voice, image, control information, etc.) without lowering the transmission efficiency.
Namely, the error correction encoding device of the present invention is provided with input information extraction means for extracting and outputting extremely important information (for example, voice routing information, power information, etc.) or input information having an extremely high level of priority (for example, information having high urgency or immediacy), from within input information (for example, voice encoding data) that is to be subject to error correction, and error correction encoding means for obtaining error detection information for every specified bit length of input information extracted by the input information extraction means, and carrying out block coding by combining the error detection information and input information of a specified bit length, carrying out encoding processing using error correction code for block data obtained from the block coding and outputting error correction encoding data.
By adopting this type of configuration, error detection information is obtained for information within the input information which is extremely urgent or has extremely high priority and appended to block coded information, and error correction encoding is carried out using error correction code for the block data and outputted. Thus, it is possible to transmit extremely urgent information or information having extremely high priority even through an inferior radio communication path, by applying sufficient countermeasures for transmission errors. Also from the point of view of transmission efficiency, since information for error detection is only appended to extremely important information, there is no danger that the transmission efficiency will be lowered excessively.
Further, an error correction decoder of the present invention comprises decode candidate estimatin

REFERENCES:
patent: 4306305 (1981-12-01), Doi et al.
patent: 4429390 (1984-01-01), Sonoda et al.
patent: 4747104 (1988-05-01), Piret

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