摘要
OFDM(Orthogonal Frequency Division Multiplexing)系统能够对抗电力线环境中的频率选择性衰落、多径干扰、脉冲噪声等。由于符号定时偏差和载波频率偏差将会产生较为严重的符号间干扰(ISI)和信道间干扰(ICI),从而降低OFDM系统性能,所以OFDM关键技术之一同步技术的好坏占有较为重要的地位。本文对OFDM同步技术做了系统的研究和分析,给出四种同步算法,能够较好地进行符号定时同步和载波频偏估计,可针对不同的电力线通信环境选用不同的同步算法。
Orthogonal Frequency Division Multiplexing（OFDM） effectively mitigates frequency selective fading,muti-path,impulse interference and other impairments of power line channels.The time offset and frequency offset will introduce Inter Symbol Interference（ISI） and Inter Carriers Interference（ICI）,which degrade the performance,thus synchronization technique as the key point of OFDM plays an important role.Based on the study and analysis of synchronization technique,four effectively algorithms which can support fine symbol timing synchronization and carrier frequency offset estimation,are introduced for different power line channels.
出处
《电测与仪表》
北大核心
2010年第4期35-39,共5页
Electrical Measurement & Instrumentation
