DVB-S2系统的优化数字自动增益控制

Yulong Zhang, Jialin Cao, Chuan Wu, Jun Han, Xiaoyang Zeng
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引用次数: 2

摘要

在DVB-S2接收机中,解调器需要精确的接收符号距离参考星座点的软信息。采用数字自动增益控制来调节输入信号到参考星座的电平,以获得良好的解调性能。本文在分析一种新颖合理的成本函数和潜在星座特性的基础上,提出了一种优化的DVB-S2系统数字自动增益控制方法。该方案在信噪比要求的范围内都能很好地工作,并且支持有导频和无导频模式,且复杂度较低。对该方案进行了详细的数学推导,并通过仿真结果清楚地证明了该方案相对于传统方法的优越性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optimized digital automatic gain control for DVB-S2 system
In DVB-S2 receiver, the demodulator needs accurate soft information about the received symbol distance from the reference constellation points. Digital automatic gain control is adopted to adjust the level of the incoming symbols to the reference constellations to help obtaining a good demodulator performance. In this paper, an optimized digital automatic gain control method for DVB-S2 system is presented based on the analysis of a novel reasonable cost function and the potential constellation property. The proposed scheme can operate adequately well over the demanded range of signal-to-noise ratio and support both with pilot and without pilot modes with much lower complexity. The mathematical derivation of the scheme is given in detail and the advantages over the conventional methods are clearly demonstrated by simulation results.
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