Apparatus and method for ldpc decoding

PURPOSE: An apparatus and a method for LDPC(Low Density Parity Check) decoding are provided to perform tentative decoding by comparing a repetitive decryption number with an minimum repetitive decoding number. CONSTITUTION: A repetitive decoding apparatus(200) includes a decoding unit(210), a SNR(Signal to Noise Ratio) estimating unit(220), and a repetitive decoding number setting unit(230). The decoding unit recoveries a valid code word from a received signal by repetitively decoding about the received signal. The SNR estimating unit estimates a SNR of the received signal. The SNR estimating unit estimates the SNR of the received signal using any SNR estimating method. The repetitive decoding number setting unit sets the minimum repetitive decoding number of the received signal based on a measured SNR.