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Syudy on Frame Synchronization Methods for Digital Satellite Communications System

数字卫星通信系统帧同步方法研究

基本信息

批准号：
02805041
负责人：
TAKAHATA Fumio
金额：
$ 1.28万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02805041/
关键词：
Phase Shift Keying Unique Word Quantization Frame Synchronization Soft-decision Data Performance Digital Satellite Communications Allowable Enclidian Distance 衛星通信同期保持同期引込み

项目摘要

Frame synchronization is an essential function for providing digital transmission services in digital satellite communications systems. It consists of a detection of frame synchronization pattern called "Unique Word (UW)", and an establishment of synchronization by detecting UWs consecutively. The UW detection in the receiving side is realized based on Euclidian distance between received signal vector and UW vector in multi-dimentional space, the dimension of which coincides with the length of UW. An application of quantized soft-decision data to UW detection is discussed from the practical point of view, and a theoretical and experimental approaches are established for obtaining a variety of UW detection characteristics. The obtained performance such as unique word missed, false detections and so on is quantitatively evaluated, compared with that of conventional hard-decision data and non-quantized soft-decision data. It is concluded from the quantitative evaluation that the application of quantized soft-decision data has potential to realize effectively the UW detection complying with design objective. With respect to the frame synchronization, a theoretical approach is established for calculating a variety of frame synchronization characteristics from those of UW detection. It becomes obvious from the quantitative evaluation that the UW detection using soft-decision data provides better performance on the criteria of reframe time and sync loss detection & reframe time in the low C/N condition, compared to the use of hard-decision and non-quantized soft-decision data.

帧同步是数字卫星通信系统提供数字传输服务的基本功能。它包括对帧同步模式“唯一字（Unique Word， UW）”的检测，以及通过连续检测UW来建立同步。接收端的UW检测是基于接收信号矢量与UW矢量在多维空间中的欧氏距离来实现的，该距离的维数与UW的长度重合。从实践的角度讨论了量化软判决数据在UW检测中的应用，并建立了一种获得多种UW检测特性的理论和实验方法。并与传统硬决策数据和非量化软决策数据进行了比较，定量评价了所获得的非量化软决策数据的遗漏唯一词、误检等性能。定量评价表明，量化软决策数据的应用具有有效实现符合设计目标的UW检测的潜力。在帧同步方面，建立了一种从UW检测中计算各种帧同步特性的理论方法。从定量评价中可以明显看出，在低C/N条件下，使用软判决数据的UW检测在重帧时间和同步丢失检测重帧时间的标准上比使用硬判决和非量化的软判决数据提供了更好的性能。