Method and device for decoding low-density parity check code and optical information reproducing apparatus using the same
First Claim
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1. 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.
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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.
17 Citations
8 Claims
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1. A method of decoding a received signal encoded with an LDPC code, the method comprising:
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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. - View Dependent Claims (2)
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3. A device for decoding a received signal encoded with an LDPC code, the device comprising:
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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. - View Dependent Claims (4)
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5. 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:
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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. - View Dependent Claims (6, 7, 8)
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Specification