Method and device for decoding low-density parity check code and optical information reproducing apparatus using the same
OwnerBi-Woong Chunginventor
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Abstract
A method of decoding a received signal encoded with an LDPC code is provided. The method comprises initializing bits with an initial value of the received signal, obtaining posterior values of the bits by iteratively decoding the bits in a row direction and a column direction, determining on the basis of the posterior values whether an iterative decoding operation should be performed and comparing the posterior values with predetermined values and updating the initial value of the bits, when it is determined that the iterative decoding operation is be performed.
Claims20
A method of decoding a received signal encoded with an LDPC code, the method comprising:
- initializing bits with an initial value of the received signal;
- obtaining posterior values of the bits by iteratively decoding the bits in a row direction and a column direction;
- determining on the basis of the posterior values whether an iterative decoding operation should be performed;
- and
- comparing the posterior values with predetermined values and updating the initial value of the bits, when it is determined that the iterative decoding operation is performed.
A device for decoding a received signal encoded with an LDPC code, the device comprising:
- an initialization unit initializing bits with an initial value of the received signal;
- an iterative decoding unit obtaining posterior values of the bits by iteratively decoding the bits in a row direction and a column direction;
- an iteration determining unit determining on the basis of the posterior values whether an iterative decoding operation should be performed;
- and
- a partial compensation unit comparing the posterior values with a predetermined value and updating the initial value of the bits, when it is determined that the iterative decoding operation is performed.
An optical information reproducing apparatus for reproducing optical information from a reproducing beam generated by irradiating a reference beam to a recording medium, the apparatus comprising:
- an optical information detector detecting the reproducing beam and detecting an image of a data page from the reproducing beam;
- an equalizer equalizing the image of a data page;
- and
- a data decoder receiving an output of the equalizer as a received signal and decoding an LDPC code,
- wherein the data decoder comprises:
- an initialization unit initializing bits with an initial value of the received signal;
- an iterative decoding unit obtaining posterior values of the bits by iteratively decoding the bits in a row direction and a column direction;
- an iteration determining unit determining on the basis of the posterior values whether an iterative decoding operation should be performed;
- and
- a partial compensation unit comparing the posterior values with a predetermined value and updating the initial value of the bits, when it is determined that the iterative decoding operation is performed.
A method of decoding, the method comprising:
- receiving a signal corresponding to an stored image of a data page of bits encoding a LDPC code in a storage device, said bits being initialized with an initial value of the received signal;
- iteratively decoding the bits encoding the LDPC code in a row direction and a column direction of the stored image based on the initial value to obtain decoded bit values associated with one or more likelihood ratios;
- determining a variation level of a bit dependent on a misalignment of pixels within the stored image;
- updating the initial value based on the decoded bit values and the determined variation level;
- and
- determining updated values of the bits based on the updated initial value.
A device for decoding a received signal encoded with an LDPC code, the device comprising:
- an initialization unit initializing bits encoding the LDPC code with an initial value of the received signal;
- an iterative decoding unit obtaining decoded bit values based on a likelihood ratio of the bits by iteratively decoding the bits in a row direction and a column direction;
- an iteration determining unit determining on the basis of the decoded bit values whether an iterative decoding operation should be performed;
- and
- a partial compensation unit comparing the decoded bit values with a predetermined value and updating the initial value of the bits, when it is determined that the iterative decoding operation is performed.
An optical information reproducing apparatus for reproducing optical information from a reproducing beam generated by irradiating a reference beam to a recording medium, the apparatus comprising:
- an optical information detector detecting the reproducing beam and detecting an image of a data page from the reproducing beam;
- an equalizer equalizing the image of a data page;
- and
- a data decoder receiving an output of the equalizer as a received signal and decoding an LDPC code,
- wherein the data decoder comprises:
- an initialization unit initializing bits encoding the LDPC code with an initial value of the received signal;
- an iterative decoding unit obtaining decoded bit values of the bits by iteratively decoding the bits in a row direction and a column direction, said associated with a likelihood ratio;
- an iteration determining unit determining on the basis of the posterior values whether an iterative decoding operation should be performed;
- and
- a partial compensation unit comparing the decoded bit values with a predetermined value and updating the initial value of the bits, when it is determined that the iterative decoding operation is performed.
Dependencies are inferred from the claim text.