一种多带时频扩展OFDM电力线通信系统  

Multi-band time-frequency spreading OFDM for power line communication system

作　　者：李风飞[1] 郝学飞[1] 胡国荣[1] 

机构地区：[1]中国科学院微电子研究所,北京100029

出　　处：《电力系统保护与控制》2013年第9期131-136,共6页Power System Protection and Control

摘　　要：针对电力线信道特性和噪声特性以及现有技术在鲁棒性和可靠性方面的不足,提出了一种适用于电力线环境的多带时频扩展OFDM(Multi-Band Time-Frequency Spreading OFDM,MB-TFS-OFDM)系统。该系统利用时频二维扩频技术来抵抗电力线信道的时变性和脉冲噪声,引入多带技术来克制脉冲噪声和窄带噪声,采用OFDM技术以抵抗符号间干扰、满足对速率的需求。与OFDM系统相比,MB-TFS-OFDM以牺牲G(扩频因子)倍的速率,获得10log(G)dB的增益;通过频带自适应选择和多带滤波,提高系统的鲁棒性。仿真结果显示,MB-TFS-OFDM性能优于OFDM和时频扩展OFD(MTime-Frequency Spreading OFDM,TFS-OFDM),尤其在脉冲噪声环境下,性能改善达5dB。This paper proposes a Multi-Band Time-Frequency Spreading OFDM （MB-TFS-OFDM） system used in powerline environment in accordance with the characteristics of powerline channels and its noise, and the shortcomings of the existing technology in robustness and reliability. The system resists time variability of the powerline channels and the impulse noise through Time-Frequency Spreading technology, restrains the impulse noise and narrowband noise through the adoption of multiband technology, and resists the intersymbol interference and meets the need of speed through OFDM technology. Compared with the OFDM system, the MB-TFS-OFDM acquires a gain of 10＊log （G） dB at the cost of G-times speed, and enhances the robustness of the system through the adaptive selection of the frequency band and multi-band filter. The simulation results show that the MB-TFS-OFDM performances are better than OFDM and Time-Frequency Spreading OFDM, with a performance improvement of 5dB under impulse noise environment.

关 键 词：电力线通信 二维扩频 OFDM 多带滤波器 脉冲噪声 窄带噪声 

分 类 号：TN913.6[电子电信—通信与信息系统]