FMT系统中的C/I推导及其占OFDM系统的性能比较  

C/I derivation of FMT system and its performance comparison with OFDM system

作　　者：邹喻[1] 庞伟正[1] 刘雪飞[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2008年第5期28-32,共5页Applied Science and Technology

摘　　要：在频率选择性时变衰落信道中,由于衰落信道造成了相位和幅度失真,不仅破坏了滤波多音调制(FMT)系统中不同子载频间的正交性,而且破坏了基带匹配滤波器的精确奈魁斯特抽样条件,故传输信号将产生失真.该文通过分析频率选择性时变衰落信道下的接收机解调信号,得出了FMT系统中平均载干比(C/I)的量化表达式,并且在相同的信道条件和频谱效率下对FMT系统和OFDM系统的载干比(C/I)以及系统性能做了比较.In frequency-selective time-varying fading channels, the phase and amplitude are distorted because of fading channels. It not only destroys the orthogonality between different subcarriers, but also ruins the precise Nyquist sampling condition of the baseband matched filters. Therefore the transmitted signals will be distorted. In this paper, an average carrier-to-interference（C/I） ratio was quantified by analyzing the modulated signals in re- ceiver under frequency-selective time-varying fading channels. A comparison of C/I ratio was made between FMT system and OFDM system under the same frequency-selective time-varying fading channel conditions.

关 键 词：滤波多音调制 载干比 Farmer算法 

分 类 号：TN911.4[电子电信—通信与信息系统]