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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.

在数字卫星通信系统中，帧同步是提供数字传输服务的基本功能。它包括一个帧同步模式的检测称为“唯一字（UW）”，并通过连续检测UW建立同步。接收端的UW检测是根据接收信号矢量与UW矢量在多维空间中的欧氏距离来实现的，多维空间的维数与UW的长度一致。从实际应用的角度讨论了量化软判决数据在UW检测中的应用，建立了获得各种UW检测特性的理论和实验方法。定量评估所获得的性能，如唯一字丢失，错误检测等，与传统的硬判决数据和非量化的软判决数据进行比较。定量评估表明，量化软判决数据的应用有潜力有效地实现符合设计目标的UW检测。在帧同步方面，建立了一种从UW检测的帧同步特性计算各种帧同步特性的理论方法。从定量评估中可以明显看出，与使用硬判决和非量化软判决数据相比，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和重帧时间方面提供了更好的性能。