Signal coding and modulating method and device for digital interphone, signal demodulating and decoding method and device for digital interphone

Abstract

The invention discloses a signal coding and modulating method and a signal coding and modulating device for a digital interphone, and a signal demodulating and decoding method and a signal demodulating and decoding device for a digital interphone, for solving the problems that a technology for solving burst errors of the existing digital interphone with FSK (Frequency-shift keying) modulation is limited in error correcting capability, large in storage overhead and treatment delay and high in system implementation cost. According to the invention, bit streams are subjected to RS coding and FSK modulation in the digital interphone at a sending end, and received signals are subjected to FSK demodulation and RS decoding in the digital interphone at a receiving end; as the RS coding / decoding technologies are applicable to correcting the burst errors, the plurality of burst errors collected in a block of a binary linear block code can be effectively corrected, thus not needing to randomize and homogenize the burst errors by adopting an interweaving technology, and thereby the digital interphone does not need to be provided with a functional module for performing interweaving / de-interleaving treatment, and can correct burst errors, decrease storage overhead and treatment delay and reduce implementation cost.

Description

technical field [0001] The invention relates to the field of digital walkie-talkies, in particular to a signal coding modulation / demodulation and decoding method and device for a digital walkie-talkie. Background technique [0002] Digital walkie-talkie is a kind of terminal equipment that is wireless and can be used in mobile point-to-multipoint communication. It belongs to the field of special digital wireless communication technology. Advanced features have been widely used. At present, the widely used digital walkie-talkie standards in the world include ETSI (European Telecommunications Standards Institute, European Telecommunications Standards Institute) DPMR (Digital Private Mobile Radio, Digital Personal Mobile Radio) / DMR (Digital Mobile Radio, Digital Mobile Radio); P25 and other standards. At present, the DPMR / DMR standard has gradually become the mainstream technical standard of international digital walkie-talkies. [0003] The channel coding scheme adopted i...

AI Technical Summary

Problems solved by technology

[0008] The embodiment of the present invention provides a signal coding modulation / demodulation decoding method and device for a digital walkie-talkie, which is used to solve the problems of limited error correction capability, storage overhead and Deal with the problems of large delay and high system implementation cost

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