Irregular Repeat Accumulate Codes for Holographic Data Storage System
Ji Zhang · Luoyang Shifan Xueyuan xuebao · 2008
Forward error correction codes have become a practical solution in improving capacity of holographic memory system.Irregular repeat accumulate(IRA) codes have good performance very closed to Shannon limit.IRA code has linear-time encoding and decoding algorithms.In this paper,firstly we study holographic memory channels and present two kinds of models: Chi-square distribution and Gaussian distribution model.Then we apply IRA codes to the holographic memory system.Simulation results show that the performance of IRA outperforms traditional RS codes in holographic memory system.The decoder based on Chi-square also has better performance than that of the decoder based on Gaussian noise assumptions.