Two Dimensional parallel Signaling and Detection Techniques with Applications to Volume Optical Memories

二维并行信号发送和检测技术及其在体积光学存储器中的应用

• 批准号: 9628405
• 负责人: Mark Neifeld
• 金额: $ 17.8万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9628405&HistoricalAwards=false
• 关键词: Two; Dimensional; parallel; Signaling; Detection

A parallel two-dimensional memory (i.e., one that stores and retrieves 2D pages (arrays) of digital data) represents a fundamentally different memory architecture. This 2D parallel architecture has the potential for capacity and speed performance which is orders of magnitude beyond the expected physical limits of traditional lD storage architectures. A volume optical memory is a system which stores data pages within a three dimensional optical medium. These systems have the potential combination of large storage capacity ( 10^l2 bits/cm^3), high speed random access via massless scanning (10 ns), and very large data transfer rates ( 10^10 bits/sec) owing to the 2D storage/retrieval of data.. Direct application of conventional communication theoretic techniques to 2D parallel memories is complicated by the truly 2D nature of the data format. In addition, a volume optical memory implementation typically results in a storage channel with very complex noise and interference. Factors contributing to the operating environment include (I) the intensity transformation and subsequent spatial averaging of the coherent optical signal as a result of optoelectronic conversion, (ii) non Gaussian noise sources such as shot and speckle, and (iii) complex data dependent interference sources such as inter-page crosstalk and space variant intersymbol interference within a given page. This research program is concerned with signaling, equalization, and decision schemes as they apply to parallel 2D data channels, with specific consideration given to coherent (holographic) volume optical memory systems. One objective of this research program is to develop the theoretical foundation for signaling and detection in 2D digital communication systems. Another objective is the application of this theory to develop robust, implementable signaling and detection techniques for volume optical memory systems. The plan for achieving these objectives is based on the development of relatively simple models of the volume optical memory system to be used for development and analysis of specific signaling and detection algorithms. Performance bounds for the optimal detection strategies, as well as efficient algorithms for their realization, will be sought in the data detection phase of the research. Simple, suboptimal data detectors which exploit the 2D nature of the data format will also be developed and their performance characterized relative to that of the optimal detection rule. The signal design component will be concerned with error correction coding for use with 2D asymmetric channels, precoding techniques for combating data-dependent interference within and between pages, pixel profile optimization using simple optical masks, and novel signaling strategies for non-Gaussian channels. The third component involves the creation of a sophisticated simulation engine for the evaluation and refinement of new signaling and detection methods. This simulation engine will capture the detailed physical characteristics of volume optical memory systems and will facilitate measuring the performance and robustness of these novel 2D approaches in a real-world environment.

并行二维存储器(即，存储和检索数字数据的2D页(数组)的存储器)代表了根本不同的存储器体系结构。这种2D并行体系结构具有潜在的容量和速度性能，超出了传统LD存储体系结构的预期物理限制数量级。体积光学存储器是在三维光学介质内存储数据页的系统。这些系统具有大存储容量(10^L2比特/厘米^3)、通过无质量扫描进行高速随机访问(10 Ns)以及由于数据的2D存储/检索而具有非常高的数据传输速率(10^10比特/秒)的潜在组合。由于数据格式的真正2D性质，将传统通信理论技术直接应用于2D并行存储器是复杂的。此外，卷光学存储器实现通常导致具有非常复杂的噪声和干扰的存储通道。影响操作环境的因素包括(I)作为光电转换的结果的相干光信号的强度转换和随后的空间平均，(Ii)非高斯噪声源，例如炮击和散斑，以及(Iii)复杂的数据相关干扰源，例如页间串扰和给定页面内的空间变量码间干扰。本研究计划涉及应用于并行2D数据通道的信令、均衡和判决方案，并特别考虑相干(全息)体光存储系统。本研究计划的目的之一是为2D数字通信系统中的信令和检测奠定理论基础。另一个目标是应用这一理论来开发用于容量光存储系统的健壮的、可实现的信号和检测技术。实现这些目标的计划是基于开发相对简单的体积光学存储系统模型，以用于开发和分析特定的信号和检测算法。在研究的数据检测阶段，将寻求最优检测策略的性能界限以及实现它们的有效算法。还将开发利用数据格式的2D性质的简单、次优数据检测器，并相对于最佳检测规则来表征其性能。信号设计组件将涉及用于2D非对称信道的纠错编码、用于对抗页面内和页面之间的依赖于数据的干扰的预编码技术、使用简单光学掩码的像素轮廓优化以及用于非高斯信道的新颖信号策略。第三个组件涉及创建一个复杂的模拟引擎，用于评估和改进新的信令和检测方法。该模拟引擎将捕获卷光学存储系统的详细物理特性，并将有助于在真实环境中测量这些新的2D方法的性能和健壮性。