Iterative decoding device of RS (Reed-solomon) cascading grid modulation code and decoding method thereof

Abstract

The invention belongs to the technical field of wireless communication and relates to an iterative decoding device of an RS (Reed-solomon) cascading grid modulation code and a decoding method thereof. The device comprises a quantification unit, a ping-pong soft value read-write cache unit, a soft input Viterbi decoder, a state record unit, a deinterleaver, an RS decoder, a decoding state treatment unit, an interleaver and a soft value modification unit, wherein the ping-pong soft value read-write cache unit comprises a ping chamber soft value read-write cache subunit and a pong chamber soft value read-write cache subunit, receives a symbol soft value sent by the quantification unit, carries out Viterbi decoding on the symbol soft value and carries out deinterleave and RS decoding on the symbol soft value after decoding; and when part of decoding has errors, decoding information and mark information are fed back to the soft value modification unit after interleave, a soft value is modified based on the size of the corresponding symbol soft value, and next iteration is carried out until decoding is right. The invention has the advantages of little hardware resource consumption, low method complexity and high iteration gain and is more suitable for realizing hardware.

Description

technical field [0001] The present invention relates to a device and method in the technical field of wireless communication, in particular to an iterative decoding device and a decoding method for an RS (Reed Solomn, Reed-Solomon code) cascaded lattice modulation code. Background technique [0002] Channel coding and decoding technology makes the communication system more reliable. Proper selection of channel coding technology can make the system performance approach the Shannon limit. LDPC code (Low Density Parity Check Code) and Turbo code are relatively classic channel coding technologies, and cascaded Code technology has been widely used, such as parallel concatenated codes, product codes, Turbo cascaded lattice modulation codes, etc. In addition, the RS cascaded lattice modulation code technology has also been widely used in today's communication systems. For example, in the ATSC standard of digital terrestrial television in the United States, a cascading method of fir...

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