| 引用本文: | 胡正伟,贺冬梅,谢志远.面向电力线通信的OFDM符号定时同步算法[J].电力自动化设备,2019,39(5): |
| HU Zhengwei,HE Dongmei,XIE Zhiyuan.OFDM symbol timing synchronization algorithm for PLC[J].Electric Power Automation Equipment,2019,39(5): |
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| 摘要: |
| 提出了一种面向电力线通信的改进正交频分复用(OFDM)符号定时同步算法，该算法结合了延迟相关算法受信道多径效应影响小以及本地相关算法具有尖锐相关峰值的优点。以延迟相关算法为主体，将同步过程分解为3个状态；通过设置状态转换条件及超时机制，可有效降低电力线噪声造成定时误判，在延迟相关算法确定的定位状态下搜索本地相关算法的峰值。建立了算法的MATLAB仿真模型，在电力线信道模型及噪声条件下，对虚警漏警概率、同步性能、简化算法的影响等指标进行了仿真分析，验证了算法的有效性。 |
| 关键词: 电力线通信 正交频分复用 前导序列 符号同步 |
| DOI：10.16081/j.issn.1006-6047.2019.05.021 |
| 分类号:TM73 |
| 基金项目:国家自然科学基金青年科学基金资助项目(6160-1182)；河北省创新创业实践基地建设项目(2017CXCY135)；河北省科技计划项目(17211704D) |
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| OFDM symbol timing synchronization algorithm for PLC |
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HU Zhengwei, HE Dongmei, XIE Zhiyuan
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School of Electrical & Electronic Engineering, North China Electric Power University, Baoding 071003, China
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| Abstract: |
| An OFDM(Orthogonal Frequency Division Multiplexing) symbol timing synchronization algorithm for PLC(Power Line Communication) is proposed, which combines the advantages that the delay correlation algorithm is slightly affected by channel multipath effect and local correlation algorithm has sharp correlation peak. The synchronization process is divided into three states according to the delay correlation algorithm. Timing misjudgment caused by the power line noise is effectively reduced by setting the state transition condition and timeout mechanism. The peak of the local correlation algorithm is searched under the location determined by the delayed correlation algorithm. MATLAB simulation model of the proposed algorithm is built, under the condition of power line channel model and noise, the probability of false alarm & missing alarm, synchronization performance and influence of simplified algorithm are simulated and analyzed, and the effectiveness of the proposed method is verified. |
| Key words: power line communication OFDM leading sequence symbol synchronization |
