FMT和OFDM在频偏影响下的可达比特率性能比较  

Performance comparison of achievable bit rate in FMT and OFDM system in the presence of frequency offset

作　　者：王秋瑾[1] 高振明[1] 朱维红[1] 高有军[1] 许峰[1] 

机构地区：[1]山东大学信息科学与工程学院,山东济南250100

出　　处：《山东大学学报（理学版）》2005年第4期81-85,89,共6页Journal of Shandong University(Natural Science)

基　　金：国家自然科学基金资助项目(60372029)

摘　　要：滤波多音(filteredmultitone,FMT)和正交频分复用(orthogonalfrequencydivisionmultiplexing,OFDM)同属于多载波调制技术,FMT子信道频谱不重叠,OFDM子信道频谱正交.频谱特性的差异导致对各种干扰的敏感性不同.FMT技术的频谱特性使其可以有效克服信道间干扰(ICI),但需要在接收端加入有效均衡器以消除符号间干扰(ISI).OFDM的频谱正交性容易受到ICI的影响被破坏.分析AWGN环境中,频偏对FMT和OFDM系统造成的干扰,通过计算机仿真比较频偏对两种系统的可达比特率性能的影响.Filtered multi-tone （FMT） modulation and orghogonal frequency division multiplexing （OFDM） modulation both belong to multicarrier modulation. The subcharmels are nonoverlapping in FMT but orthogonal in OFDM, which result in different sensitivity to interference. FMT system reduces the effect of Intra/Inter channel interference, but it needs equalizer to eliminate inter symbol interference （ISI）. OFDM system tends to damage the onhogonality for ICI. Through the analysis of the interference introduced by frequency offset in FMT and OFDM in AWGN environment, the performance of achievable bit rate in the presence of frequencv offset by simulation is compared.

关 键 词：虑波多音(VMT) OFDM 频偏 可达比特率 

分 类 号：TN763[电子电信—电路与系统]