光盘存储读出信道的实现

Hardware realization of optical disc channel simulation

通过构建适合于硬件电路实现的读出信道数学模型以及对光存储系统中存在的噪声、抖晃和扰动的分析,在FPGA(Field programmable gate array)硬件平台上,实现了对任意二阶至四阶记录光盘读出RF(Radio frequency)信号的模拟实时连续输出。在信道模拟的硬件算法设计中,采用了四倍频的方法和基于ROM(Read-only memory)查找表的方法实现了100Mbit高速情况下的卷积运算。设计结果得到了逼真的网眼图,验证了模型的正确性,且已作为光盘系统后续信号处理模块的信源,加快了光盘系统研制开发的步伐。

Through building up an optical disc channel model that is fit for realization on FPGA hardware and through ana- lyzing noise, jitter and disturbance existing in optical disc storage systems, real-time continuous output of simulative RF signals for any two-level to four-level input data is realized. In the algorithm of simulation on hardware, a novel method of quadrupling frequency and an approach of linking up in ROM are proposed to realize the convolving calculation under 100Mbit high-speed condition. The simulation results show clear eye patterns, which verify the channel model set up. The results can be used as signal ,sources for following system designs, which greatly quickens the pace of developing and research.