时间选择性快衰落信道中OFDM系统的ICI功率分析  

Analysis of ICI power of OFDM systems in time selective fast fading channel

作　　者：刘博[1,2] 郭达[2] 江锋[2] 宋俊德[2] 

机构地区：[1]61672部队 [2]北京邮电大学电子工程学院

出　　处：《电路与系统学报》2009年第4期70-73,共4页Journal of Circuits and Systems

基　　金：国家"863"计划(2003AA12331004)

摘　　要：OFDM(Orthogonal Frequency Division Multiplexing,正交频分复用)系统中,信道的时间选择性快衰落会破坏子载波间的正交性,导致系统中出现载波间干扰(Inter-carrier Interference,ICI),降低OFDM系统性能。论文使用信道函数泰勒展开式的前两项近似信道函数,并以此为基础分析了OFDM在时间选择性快衰落信道中的性能,给出了ICI功率及其上界与信道最大多普勒扩展的关系式。仿真分析表明论文给出的关系式和ICI功率上界能够较为准确的描述OFDM系统在快衰落信道中ICI功率及其上界与信道最大多普勒扩展的关系。In OFDM system, time selective fast fading channel can destroy orthogonality of sub-carriers, introduce ICI into the system and degrade the performance of system. The performance of OFDM system in time selective fast fading channel is analyzed in the paper. The first two terms of the channel function＇s Taylor expansion is used to approximate to the channel function. Also, the expression of the upper bound of the ICI power of OFDM system in terms of the maximum Doppler spread of the channel is presented. Simulation results show that the expressions and the upper bound can exactly describe the relation of the ICI power of OFDM system with the maximum Doppler spread of the channel.

关 键 词：正交频分复用 时间选择性快衰落信道 载波间干扰 

分 类 号：TN919.3[电子电信—通信与信息系统]