| 摘要 |
A decoding device that achieves an improvement in code performance by optimization of the quantization width, thus allowing for high-precision decoding of LDPC codes, is provided. A decoding device (3) includes a distribution determining unit (20) that determines a distribution of noise that is superposed on data received by a receiving unit (10), a quantization width determining unit (30) that determines the quantization width that is optimized so that the error probability after decoding becomes the minimum with respect to the noise distribution determined by the distribution determining unit (20) or the noise distribution determined by the distribution determining unit (20) becomes the maximum with respect to a given error probability after decoding, a quantizing unit (40) that quantizes the probability distribution of the received value received by the receiving unit (10) with a predetermined low bit number according to the quantization width determined by the quantization width determining unit (30), and a message determining unit (50) that determines a message as information bits based on the probability distribution of the received value quantized by the quantizing unit (40).
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