短帧条件下LDPC性能研究

Performance of LPDC codes in short information length

低密度校验码(LDPC)在信息帧较长时都表现出了非常优异的性能,但信息帧较短时却并非如此.本文仿真了在短帧情况下LDPC码的性能,给出了在短帧条件下选择LDPC码的原则,对工程实践具有一定的理论指导意义.同时,结合工程实现对LDPC码的译码复杂性做了较为深入的探讨,最终指出,迭代译码时迭代次数设为3 0左右合适,对实践具有较高的参考价值.

The performance of low density parity check （LDPC） codes is very perfect when their information length is long. If their information length is short, their performance are not very good. This paper simulates the performance of LDPC codes, and provides principle in selecting LDPC codes with short information length. It has directional effect to engineering implementation. At the same time, this paper analyzes the decoding complexity of LDPC, and points out that 30 is more reasonable in iterative decoding LDPC codes. This conclusion is worth of engineering implementation.