摘要
在全息存储系统中,噪声分布是不均匀的,为了对存储的信息位进行不等保护,文中采用能纠不均匀错误的IRA码为系统的纠错码。通过高斯估计方法设计出适合全息存储系统的IRA码,并对其在系统中的应用进行了仿真,结果表明全息信道中IRA码的性能要远优于RS码。
In volume holographic memory（VHM） systems, noise distribution is nonuniform. For the unequal error protection of information bits, this paper proposed that irregular repeat - accumulate（IRA） codes which can correct nonuniform error are used for correcting errors in the systems. IRA codes are optimized by Gaussian approximation methods in VHM systems. Finally, we simulated in the systems . The results show that the performance of IRA codes in VHM systems is superior to RS cedes.
出处
《激光杂志》
CAS
CSCD
北大核心
2008年第6期51-52,共2页
Laser Journal
关键词
IRA码
体全息存储
高斯估计
不均匀错误
Irregular repeat-accumulate codes
volume holographic memory
Gaussian approximation
nonuniform errors
