CIF:Small:GOALI:Signal Processing and Coding for Two-Dimensional Magnetic Recording Channels

CIF:Small:GOALI：二维磁记录通道的信号处理和编码

• 批准号: 1218885
• 负责人: Benjamin Belzer
• 金额: $ 45.36万
• 依托单位: Washington State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1218885&HistoricalAwards=false
• 关键词: CIF; Small; GOALI; Signal; Processing

Industry is approaching the limit of the data storage density possible on magnetic disks with the traditional approach of reading and writing data on a single-track. This research considers an alternate approach called two dimensional magnetic recording (TDMR), wherein bits are read and written in two dimensions on conventional magnetic disks. A key problem in TDMR is that a given magnetic grain on the disk retains the polarization of the last bit written on it; hence, if a grain is large enough to contain two bit centers, the oldest bit will be overwritten by the newer one if they have different polarities. Bits are read from the disk by a 2D read head. Because bits are stored at high density, the signal read from a given bit suffers 2D intersymbol interference (2D ISI) from bits in both down and cross track directions. This research allows industry to continue to refine conventional magnetic recording technology, without radical redesign of the recording medium.The investigators study 2D signal processing and coding techniques to combat grain overwriting and 2D ISI in TDMR, with the goal of approaching the recently estimated channel capacity of 0.5 bit/grain. Specific objectives include:1) Investigate detectors for the TDMR magnetic grain channel based on three channel models: rectangular-grain model, discrete-grain Voronoi model, and Voronoi model. 2) Integrate grain channel detection with 2D ISI detection and with channel decoding. 3) Develop capacity bounds for the TDMR/ISI channel models.4) Evaluate the developed algorithms against the capacity bounds and against experimental data from the project s industrial partner Hitachi Global Storage Technologies, a Western Digital company.

行业正在使用传统的读取和编写单轨数据的数据来接近磁盘上可能的数据存储密度的极限。这项研究考虑了一种称为二维磁记录（TDMR）的替代方法，其中在传统磁盘上以二维读取和写入其中的位。 TDMR中的一个关键问题是，磁盘上的给定磁粒保留了上面写的最后位的极化。因此，如果谷物足够大，可以包含两个位中心，则最古老的位将被较新的极性所覆盖。零件由2D读取头从磁盘中读取。由于位存储在高密度下，因此信号从给定位读取的位置会遭受2D Intersymbol干扰（2D ISI），并在向下和跨轨道方向上的位。这项研究使行业能够继续完善常规磁性记录技术，而无需重新设计记录介质。研究人员研究2D信号处理和编码技术，以打击TDMR的谷物覆盖和2D ISI，其目的是接近最近估计的0.5位频道容量。具体目标包括：1）基于三个通道模型的TDMR磁性晶粒通道的检测器：矩形 - 元模型，离散谷物伏罗尼元模型和Voronoi模型。 2）将晶粒通道检测与2D ISI检测和通道解码相结合。 3）为TDMR/ISI渠道模型开发容量界限。4）评估已开发的算法针对能力界限，并根据项目的工业合作伙伴Hitachi Global Storage Technologies（西方数字公司）的实验数据进行评估。