一种非规则LDPC码的改进型UMPBP—Based译码算法

为了减小UMPBP—Based译码算法相对于LLR—BP译码算法的性能损失，提出了一种改进型UMPBP—Based译码算法，校验节点消息处理时，通过合理地设置校正因子与偏移因子2种参数，将NormalizedBP-Based和OffsetBP—Based2种译码算法进行有效的融合；变量节点消息处理时，引入了一种LLR—BP译码算法中的震荡补偿算法．仿真结果表明，针对非规则LDPC码，在一定范围内误码率相同的条件下，改进型UMPBP-Based译码算法与UMPBP—Based、NormalizedBP—Based和OffsetBP-Based3种译码算法相比较，译码性能得到明显的改善，可以更有效地逼近性能优异的LLR—BP译码算法．

An improved UMP BP-based decoding algorithm for irregular LDPC codes

In order to reduce the performance loss of UMP BP-based decoding algorithm relative to LLR-BP decoding algorithm, an improved UMP BP-based decoding algorithm is proposed. When the check nodes process the message, the normalized BP-based decoding algorithm and offset BP-based decoding algorithm are integrated effectively by setting a correction factor and an offset factor reasonably. When the variable nodes process the message, an oscillation compensation algorithm based on LLR-BP decoding algorithm is introduced. Simulation results show that based on the irregular LDPC codes and under the condition of the same bit error rate within a certain range, the improved UMP BP-based decoding algorithm improves the decoding performance greatly compared with the three decoding algorithms which are based on UMP BP, normalized BP and offset BP decoding algorithms, respectively, and therefore quite efficiently approaches to the LLR-BP decoding algorithm which has excellent performance.