使用实际数据的数字读通道的比较和优化

D. Woods
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引用次数: 1

摘要

针对磁盘驱动器读通道提出了各种数字均衡和检测方案,并将其模拟为洛伦兹通道[Moon和Carley, 1990]。随着线性记录密度大于每半幅脉冲宽度(PW50)两个通道比特的设计,考虑到非线性失真,如部分擦除,需要使用线性洛伦兹模型以外的技术进行通道模拟。本文描述了磁盘驱动器设计者在使用从磁盘文件环境中获得的实际数据的通道模拟器优化数字读通道性能时所面临的考虑。这个真实的数据通道模拟器在软件中实现均衡和检测,使用来自spinstand的采样数据,允许灵活地调查不同通道方案的性能,而无需构建昂贵的硬件。显示了在不同用户(信息)密度下所选通道的偏离轨道数据样本,以及偏离轨道的洛伦兹模拟。给出了每个信道的优度数,以一种快速的方式近似地最小化误码率(BER),为磁盘驱动器在自适应调整期间检查信道质量提供了算法。
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Comparison and optimization of digital read channels using actual data
Various digital equalization and detection schemes have been proposed for disk drive read channels and simulated as a Lorentzian channel [Moon and Carley, 1990]. With the design of linear recording densities greater than two channel bits per half amplitude pulsewidth (PW50), concerns over nonlinear distortions, such as partial erasure, require channel simulation with techniques other than the linear Lorentzian model. The paper describes the considerations a disk drive designer faces when optimizing the performance of digital read channels with a channel simulator that uses actual data obtained from a disk file environment. This real data channel simulator accomplishes equalization and detection in software using sampled data from a spinstand allowing the flexibility of investigating the performance of different channel schemes without having to build expensive hardware. Sample offtrack data for selected channels at various user (information) densities are shown, along with ontrack Lorentzian simulation. Goodness numbers for each channel are presented which approximately minimize bit error rate (BER) in a quick way, providing algorithms for a disk drive to check channel quality during adaptive adjustments.<>
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