Collaborative Research - New Directions in Turbo Coding

协作研究 - Turbo 编码的新方向

• 批准号: 0075514
• 负责人: Daniel Costello
• 金额: $ 36万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0075514&HistoricalAwards=false
• 关键词: Collaborative; Research; New; Directions; Turbo

ABSTRACTThis research involves the general area of error control coding for digital communication and storage systems. In particular, it describes a number of fundamental research topics related to a powerful new method of error control coding called turbo coding. The research has two major goals: (1) to propose new turbo coding schemes with performance and/or complexity advantages compared to the current state-of-the-art, and (2) to advance the fundamental state of knowledge regarding this exciting new approach to error control coding. Although still very new, turbo coding is beginning to be applied in numerous areas that require error control techniques, including deep space communication, satellite communication, and digital cellular telephony, to name just a few. Because of its ability to perform close to theoretical limits with reasonable implementation complexity, it is anticipated that turbo coding and related techniques will have an enormous impact on virtually all applications of error control coding over the next 10 years or so.Turbo coding can achieve moderate bit error rates (in the range of 10-4 to 10-6) at signal-to-noise ratios very close to channel capacity. However, there is still room for improvement in turbo coding performance, particularly in applications that require bit error rates below 10-6. Further, there is considerable theoretical interest in achieving a more complete fundamental understanding of the key properties of turbo codes that result in such excellent performance. The investigators study several new basic research problems in turbo coding. Among the topics to be investigated are (1) several new turbo code designs capable of achieving even better performance than existing schemes, (2) the introduction of a more general class of turbo codes that has the potential to yield better codes and/or reduced decoding complexity compared to standard turbo coding methods, and (3) the development of a new sub-optimum soft-in, soft-out decoding approach that can be used with more codes, thus offering the promise of near capacity performance at very low bit error rates, say below 10-10.

摘要本研究涉及数字通信与存储系统的错误控制编码的一般领域。特别地，它描述了一些与一种强大的新的错误控制编码方法——涡轮编码相关的基础研究课题。该研究有两个主要目标：(1)提出与当前最先进的技术相比具有性能和/或复杂性优势的新涡轮编码方案；(2)推进有关这种令人兴奋的错误控制编码新方法的基本知识状态。虽然涡轮编码还很新，但它已开始应用于许多需要误差控制技术的领域，包括深空通信、卫星通信和数字蜂窝电话，仅举几例。由于它的性能接近理论极限，并且具有合理的实现复杂性，因此预计涡轮编码和相关技术将在未来10年左右对几乎所有错误控制编码的应用产生巨大影响。Turbo编码可以在信噪比非常接近信道容量的情况下实现适度的误码率（在10-4到10-6的范围内）。然而，turbo编码性能仍有改进的空间，特别是在要求误码率低于10-6的应用中。此外，有相当大的理论兴趣，以实现更完整的基本理解的关键性质的涡轮码，导致如此优异的性能。研究了turbo编码中几个新的基础研究问题。要研究的主题包括：(1)几种新的涡轮码设计能够实现比现有方案更好的性能，(2)引入一种更通用的涡轮码，与标准涡轮编码方法相比，它有可能产生更好的代码和/或降低解码复杂性，以及(3)开发一种新的次优软进软出解码方法，可用于更多代码。因此，在非常低的误码率（例如低于10-10）下提供接近容量性能的承诺。