Partial-response maximum-likelihood(PRML)technology has been broadly used in current magnetic recording systems,and shows great potential to be applied in the third-generation optical disc systems using blue lasers.In...Partial-response maximum-likelihood(PRML)technology has been broadly used in current magnetic recording systems,and shows great potential to be applied in the third-generation optical disc systems using blue lasers.In this paper,the basic principle and application of PRML scheme are introduced.The famous PR4 magnetic recording channel has been decribed in details,and the application of PRML for optical disc system has also been discussed.展开更多
A new method for adjusting write strategy in partial response maximum likelihood systems was proposed.It utilized novel indices based on sequenced amplitude margin and the remarkable improvement of recording power mar...A new method for adjusting write strategy in partial response maximum likelihood systems was proposed.It utilized novel indices based on sequenced amplitude margin and the remarkable improvement of recording power margin was confi rmed.展开更多
本文提出了一种嵌入FIR噪声预测的部分响应最大似然算法(NPML-Noise-prediction Partial-response Maximum Likelihood),该算法改进了传统部分响应最大似然算法(PRML-Partial Response Maximum Likelihood)中Viterbi译码过程的分支度量...本文提出了一种嵌入FIR噪声预测的部分响应最大似然算法(NPML-Noise-prediction Partial-response Maximum Likelihood),该算法改进了传统部分响应最大似然算法(PRML-Partial Response Maximum Likelihood)中Viterbi译码过程的分支度量计算方法,能白化信号中有色噪声,减少误码率,提高硬盘读写通道的性能。本文还建立了读写通道的图形化仿真模型,提出了FIR滤波器长系数的快速逼近方法,并构造了检验模型工作正确性的方法。通过仿真模型对传统的Viterbi译码算法与嵌入FIR预测的NPML算法进行了分析。结果表明,在相同的存储密度下,NPML能获得比PRML高xxdb的信噪比和低xxdb的位错误率。展开更多
文摘Partial-response maximum-likelihood(PRML)technology has been broadly used in current magnetic recording systems,and shows great potential to be applied in the third-generation optical disc systems using blue lasers.In this paper,the basic principle and application of PRML scheme are introduced.The famous PR4 magnetic recording channel has been decribed in details,and the application of PRML for optical disc system has also been discussed.
文摘A new method for adjusting write strategy in partial response maximum likelihood systems was proposed.It utilized novel indices based on sequenced amplitude margin and the remarkable improvement of recording power margin was confi rmed.
文摘本文提出了一种嵌入FIR噪声预测的部分响应最大似然算法(NPML-Noise-prediction Partial-response Maximum Likelihood),该算法改进了传统部分响应最大似然算法(PRML-Partial Response Maximum Likelihood)中Viterbi译码过程的分支度量计算方法,能白化信号中有色噪声,减少误码率,提高硬盘读写通道的性能。本文还建立了读写通道的图形化仿真模型,提出了FIR滤波器长系数的快速逼近方法,并构造了检验模型工作正确性的方法。通过仿真模型对传统的Viterbi译码算法与嵌入FIR预测的NPML算法进行了分析。结果表明,在相同的存储密度下,NPML能获得比PRML高xxdb的信噪比和低xxdb的位错误率。
