| 数字中继卫星通信系统中的载波恢复技术 |
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| 引用本文： | 张润峰,张尔扬,徐先超.数字中继卫星通信系统中的载波恢复技术[J].现代电子技术,2007,30(21):85-87. |
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| 作者姓名： | 张润峰 张尔扬 徐先超 |
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| 作者单位： | 国防科技大学,电子科学与工程学院,湖南,长沙,410073 |
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| 摘 要： | 载波频偏估计是数字中继卫星通信系统中的一个关键技术。对非线性变换FFT载波频偏估计算法进行了推导,采用基于周期图峰值位置的三点插值法对FFT算法进行了改进,进一步采用二叉搜索法实现更高精度的载波频偏估计。给出了计算机仿真结果,表明该方案能够有效抑制噪声,在有限的计算量下具有良好的频偏估计性能。
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| 关 键 词： | 载波频偏估计 插值 二叉搜索 |
| 文章编号： | 1004-373X（2007）21-085-03 |
| 收稿时间： | 2007-04-11 |
| 修稿时间： | 2007年4月11日 |
Carrier Recovery Technology in Digital Relay Satellite Communication Systems |
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| ZHANG Runfeng,ZHANG Eryang,XU Xianchao.Carrier Recovery Technology in Digital Relay Satellite Communication Systems[J].Modern Electronic Technique,2007,30(21):85-87. |
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| Authors: | ZHANG Runfeng ZHANG Eryang XU Xianchao |
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| Affiliation: | College of Electronic Science and Engineering, National University of Defense Technology, Changsha, 410073, China |
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| Abstract: | Carrier frequency offset estimation is one of key technologies in digital relay satellite systems.A nonlinear transform FFT algorithm for observing carrier frequency offset is derived.An interpolation algorithm based on the peak and two adjacent points is used to improve the FFT algorithm.A dichotomous search algorithm is then proposed to achieve a more accurate result.Computer simulations have been made and the results show this scheme is effective in prohibiting noise and has good performance with considerable calculation. |
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| Keywords: | FFT |
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