摘要
APSK是DVB-S2标准中新采用的信号星座以充分提高频谱利用率,减小卫星信道非线性失真的影响。APSK不像一般的其他星座那样固定不变,而是针对不同的频谱效率有不同的相对半径。本文将讨论在DVB-S2中如何选择APSK,并介绍一种针对其星座编码特点的软判断解调方案。
Amplitude Phase Shift Keying (APSK) signal constellation, which adopted recently in DVB-S2, can increase spectral effi ciency and decrease nonlinearity over satellite channels. APSK have different relative radius for different spectral efi ciency, not like other constellations with steady structure. The paper discuss how to select APSK constellations and present a soft decision demodulaion scheme for their coding characteristic in DVB-S2.
出处
《电脑知识与技术》
2009年第3X期2426-2427,共2页
Computer Knowledge and Technology
