Signal Processing and coding for High Density Magnetic Recording Channels

高密度磁记录通道的信号处理和编码

• 批准号: 9409749
• 负责人: William Ryan
• 金额: $ 11万
• 依托单位: New Mexico State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-08-01 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9409749&HistoricalAwards=false
• 关键词: Signal; Processing; coding; Density; Magnetic

William E. Ryan RIA: Signal Processing and Coding for High Density Magnetic Recording Channels In this project we first take a closer look at previously reported results on the performance of error control codes on high density magnetic recording channels (MRCs). In particular, we derive optimal code rates (in the sense of maximizing coding gain) and then examine the gains afforded by optimal rate codes assuming both infinite and finite decoding effort. Previous work examined coding gains of non-optimal rate codes assuming an infinite decoding effort. We will compare the performance of maximum likelihood sequence detection (MLSD) of a coded MRC with that of an uncoded MRC equalized to partial response shape of equivalent complexity. Such partial response shapes are to be determined by this research. This work has applications in very high density recording systems where codes may in fact be responsible for a performance loss. We will seek to find partial response shapes appropriate for commonly used constrained codes which, when combined with MLSD, provide an improvement over today's bit-by-bit detectors. The study will include both computer simulations and analysis and will examine the effectiveness of coding and partial response techniques on actual recorders. In particular, we will examine the immunity to nonlinear interference, overwrite, and increased track density.

William E. Ryan RIA：高密度磁记录通道的信号处理和编码 在这个项目中，我们首先仔细研究了以前报道的高密度磁记录信道（MRC）上的差错控制码的性能结果。 特别是，我们得出最佳码率（在这个意义上的编码增益最大化），然后检查最佳速率码假设无限和有限的解码工作所提供的增益。 以前的工作检查编码增益的非最优速率码假设一个无限的解码工作。 我们将比较编码MRC的最大似然序列检测（MLSD）的性能与未编码的MRC均衡到部分响应形状的等效复杂性。 这种部分响应形状将由本研究确定。 这项工作在非常高密度的记录系统中有应用，其中代码实际上可能是性能损失的原因。 我们将寻求找到适合于常用的约束代码，当与MLSD相结合，提供了一个改进今天的逐位检测器的部分响应形状。 这项研究将包括计算机模拟和分析，并将检查编码和部分响应技术对实际记录器的有效性。 特别是，我们将检查免疫力的非线性干扰，覆盖，并增加轨道密度。