Constrained Concatenated Codes for Noisy Channels

噪声通道的约束级联码

• 批准号: 9612354
• 负责人: Khaled A. Abdel-Ghaffar
• 金额: $ 18.2万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-01 至 2001-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9612354&HistoricalAwards=false
• 关键词: Constrained; Concatenated; Codes; Noisy; Channels

The primary goal of this research is to develop efficient codes for noisy modulation channels such as those encountered in magnetic and optical recording devices. In these channels, it is often required to map the data to a sequence with special modulation properties; since most devices are noisy, the recorded sequence should have some error control capability as well. Coding techniques are used to transform arbitrary data to sequences that satisfy the modulation and error control requirements. Coding technology is one of the critical factors that has contributed to the astounding capacity of today's magnetic recording devices. The most commonly used coding scheme is based on concatenating an outer code for error control with an inner code for modulation. Although each of the two component codes may be optimal with respect to its function, the overall concatenated scheme may not be optimal. It is recognized now in industry that the coding gain achieved using this approach is close to reaching a saturation point. This research aims at optimizing the overall concatenated coding scheme rather than optimizing the component codes. It is expected that this approach will significantly improve the overall coding gain. To accomplish this task, the two component codes should not be independently designed and implemented. Instead, any error control capability in the inner code should be optimally exploited by the outer code for better performance. Funding for this project will be used to support graduate students in an area with many applications in data storage and communications, which are interdisciplinary in nature. There is a need for more researchers in the coding aspects of these applications.

这项研究的主要目标是为噪声调制通道（例如磁和光记录设备中遇到的调制通道）开发有效的代码。 在这些信道中，常常需要将数据映射到具有特殊调制特性的序列； 由于大多数设备都有噪声，因此记录的序列也应该具有一定的错误控制能力。编码技术用于将任意数据转换为满足调制和错误控制要求的序列。编码技术是当今磁记录设备具有惊人容量的关键因素之一。 最常用的编码方案基于将用于差错控制的外码与用于调制的内码连接起来。尽管两个分量代码中的每一个都可能就其功能而言是最优的，但是整体级联方案可能不是最优的。现在业界认识到使用这种方法实现的编码增益接近饱和点。本研究旨在优化整体级联编码方案，而不是优化组件代码。预计这种方法将显着提高整体编码增益。为了完成这个任务，两个组件代码不应该独立设计和实现。相反，内部代码中的任何错误控制功能都应该由外部代码最佳地利用，以获得更好的性能。 该项目的资金将用于支持数据存储和通信领域具有许多跨学科应用的研究生。这些应用程序的编码方面需要更多的研究人员。