| Summary: | 碩士 === 國立臺北科技大學 === 資訊工程系研究所 === 100 === The European standard for digital video broadcasting over terrestrial (DVB-T) has been implemented in several countries. DVB-T2 system uses BCH code and LDPC codes for the signal to have a better protection. We use the Sum-Product algorithm to achieve the Soft-decision decoding of LDPC codes in the original software module. We use no need to estimate the signal to noise ratio, quantization, and look-up table method to quickly complete the time-consuming operation. In order to accelerate the puncturing LDPC decoding, we use check-node merging method to generate a new parity check matrix. Finally, we invented by observing the change of Log-likelihood ratio in the number of iterations in the decoding, and thus early to give up due to signal to noise ratio is too small and unable to correct LDPC codeword to reduce waste time caused by the unnecessary iterations.
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