太赫兹科学与电子信息学报, 2017, 15 (5): 787, 网络出版: 2018-01-25  

电力无线专网中一种OFDM载波同步算法

OFDM carrier synchronization algorithm in electrical wireless network
作者单位
南瑞集团公司 国网电力科学研究院, 江苏 南京 211000
摘要
电力无线专网在1.8 GHz频段建设4G TD-LTE网络, 正交频分复用(OFDM)是其关键技术之一, OFDM系统对信道产生的载波频率偏移(CFO)很敏感, 频率偏移会造成系统性能的严重下降。因此, 需要对OFDM系统中的频率载波偏移精确估计并补偿, 以保证系统的性能。本文提出了一种用于OFDM系统中基于局部搜索的多重信号分类(MUSIC)盲CFO估计的算法, 该算法利用频率偏移矩阵列矢量与噪声子空间的正交性和CFO的单峰特性, 构造一个改进空间谱函数, 然后通过局部谱峰搜索得到频偏估计值。该算法的CFO估计性能优于传统CFO估计算法, 且能够克服传统MUSIC算法低信噪比下谱峰缺失的问题。仿真结果证明了该算法的有效性。
Abstract
Electrical wireless network constructs the 4G wireless TD-LTE network in the 1.8 GHz band, where Orthogonal Frequency Division Multiplexing(OFDM) is one of the key technologies. However, OFDM is sensitive to Carrier Frequency Offset(CFO) which will result in serious degradation of system performance. Therefore, accuracy of the CFO estimation is significant for the OFDM system and is required to ensure the performance. A blind CFO estimation for OFDM systems via local searching Multiple Signal Classification(MUSIC) algorithm is proposed. The algorithm constructs an improved spatial spectral function by combining the orthogonality between the column vectors of the CFO matrix and the noise subspace, and the single peak characteristic of CFO. The CFO estimation is obtained by local peak searching, and the problem of missing peaks under low SNR in traditional MUSIC algorithm can be overcome. Comparing to the traditional CFO estimation approaches, the proposed algorithm can improve CFO estimation performance. The simulation results validate the effectiveness and superiority of the proposed algorithm.

马涛, 冯宝, 蔡世龙, 李洋. 电力无线专网中一种OFDM载波同步算法[J]. 太赫兹科学与电子信息学报, 2017, 15(5): 787. MA Tao, FENG Bao, CAI Shilong, LI Yang. OFDM carrier synchronization algorithm in electrical wireless network[J]. Journal of terahertz science and electronic information technology, 2017, 15(5): 787.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!