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引用次数: 2
摘要
我们介绍了在欧洲RACE II HD-SAT项目框架内开发的两个卫星调制解调器。我们通过简要介绍整个系统来描述HD-SAT系统。在20 GHz范围内的传播条件特别详细，以及技术答案:优雅的退化概念。我们研究了可变比特率的tcm 8PSK调制解调器。描述了该调制解调器的特点，主要是85 ~ 70mb /s可变比特率的可能性。我们描述了一种采用时间复用调制的分层调制方案的“优雅退化”调制解调器。
HD-SAT modems for the satellite broadcasting in the 20 GHz frequency band
We present two satellite modems developed in the frame work of the European RACE II HD-SAT project. We describe the HD-SAT system by presenting briefly the overall system. The propagation conditions in the 20 GHz range are particularly detailed as well as the technical answer: the graceful degradation concept. We deal with the variable bit rate-TCM 8PSK modem. The features of this modem, mainly the variable bit rate possibilities between 85 and 70 Mb/s, are described. We describe the "graceful degradation" modem which uses a hierarchical modulation scheme with time multiplexed modulation.
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