Discrete Time Synchronization Systems for Burst Mode Communication

用于突发模式通信的离散时间同步系统

• 批准号: 9115820
• 负责人: Michael Fitz
• 金额: $ 19.72万
• 依托单位: Purdue Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-06-01 至 1995-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9115820&HistoricalAwards=false
• 关键词: Discrete; Time; Synchronization; Systems; Burst

This project is an investigation of discrete time burst mode synchronization algorithms. The goal of the work is to minimize acquisition time in synchronization to enable applications to burst mode systems such as multi-user architectures. The primary design tool is the discrete time maximum likelihood estimator. Lower bounds are sought for symbol timing with an unknown phase or frequency and for the performance of joint symbol time and carrier phase and frequency estimation wit doppler. This will establish theoretical lower limits of the acquisition performance. Maximum likelihood estimator structures for discrete time burst mode synchronization systems will then be sought. The work will focus on recursive and nonrecursive discrete time implementations. Stochastic approximation techniques will be used in the solution of the maximum likelihood equations. This will result in digital phase lock loop systems with time varying gains, greatly improving the acquisition performance over constant gain realizations. Recursive structures will be developed for both joint and marginal synchronization of carrier phase and symbol timing. Statistical characterization of the acquisition process of the resulting estimators is a major emphasis. Markov theory and efficient Monte Carlo simulation are tools. Optimal techniques for detecting the start of a burst and optimal preamble designs will be developed and investigated.

本项目是对离散时间突发模式的研究 同步算法 这项工作的目标是尽量减少 同步采集时间，使应用程序能够 突发模式系统，例如多用户体系结构。 主 设计工具是离散时间最大似然估计。 寻找具有未知相位的符号定时的下限 或频率，并用于联合符号时间的性能， 利用多普勒进行载波相位和频率估计。 这将 建立理论上的收购下限 性能 最大似然估计结构 然后，离散时间突发模式同步系统将 寻找。 工作将集中在递归和非递归 离散时间实现。 随机逼近 技术将用于解决最大似然 方程 这将导致数字锁相环系统 具有随时间变化的增益，极大地改善了采集 性能优于恒定增益实现。 递归 将为联合和边缘开发结构 载波相位和符号定时的同步。 统计 结果的获取过程的表征 估计是一个主要的重点。 马尔可夫理论与有效 是蒙特卡罗模拟的工具. 最佳技术， 检测突发的开始和最佳前同步码设计将 进行开发和研究。