This paper proposes a new min-sum algorithm for lowdensity parity-check decoding. In this paper, we first define the negative and positive effects of the received signal-to-noise ratio (SNR) in the min-sum decoding algorithm. In order to improve the performance of error correction by considering the negative and positive effects of the received SNR, the proposed algorithm applies the adaptive scaling factors to a received log-likelihood ratio as well as extrinsic information. We also propose a

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... ombined variable and check node architecture to realize the proposed algorithm with low complexity. The simulation results show that the proposed algorithm achieves up to 0.4 dB coding gain with low complexity compared to the existing min-sum based algorithms.