  Min-Sum decoding is widely used for decoding LDPC codes in many modern
digital video broadcasting decoding due to its relative low complexity and
robustness against quantization error. However, the suboptimal performance of
the Min-Sum affects the integrated performance of wireless receivers. In this
paper, we present the idea of adapting the scaling factor of the Min-Sum
decoder with iterations through a simple approximation. For the ease of
implementation the scaling factor can be changed in a staircase fashion. The
stair step is designed to optimize the decoder performance and the required
storage for its different values. The variable scaling factor proposed
algorithm produces a non-trivial improvement of the performance of the Min-Sum
decoding as verified by simulation results.
