摘要
正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)是一种能够有效对抗电力线通信中的频率选择性衰落、多径和窄带干扰的技术,而OFDM技术对同步偏差十分敏感,微小的同步偏差也会影响OFDM系统的性能。针对电力线通信中OFDM系统的同步问题,给出一种基于恒包络零自相关(CAZAC)序列的时频同步的方法。MATLAB仿真表明,所提算法在减少运算量的基础上能很好地完成符号同步和频偏同步,明显改善电力线中OFDM的同步性能。
OFDM is a promising technology for combating the frequency selective fading, multipath propagation, and narrowband interference in power line communication. However, OFDM systems are extremely sensitive to synchronization deviation. Slight synchronization deviation can affect the performance of OFDM systems. A design and implementation synchronization algorithm based on constant amplitude zero auto-correlation （CAZAC） for power line communication is proposed in this paper. MATLAB simulation proves that, with less computation, the proposed algorithm can complete symbol timing synchronization and frequency offset synchronization well and the performance of OFDM synchronization in power line communication is significant- ly improved.
出处
《电视技术》
北大核心
2013年第15期133-137,共5页
Video Engineering
基金
国家自然科学基金项目(61172075)
