信道参数对多天线OFDM系统的性能影响  

Impaction of channel parameters on system performance in OFDM system with multiple antenna

作　　者：钟俊[1] 彭启琮[1] 

机构地区：[1]电子科技大学通信信息工程学院,四川成都610054

出　　处：《系统工程与电子技术》2005年第9期1545-1548,共4页Systems Engineering and Electronics

摘　　要：讨论了在波束成形的多天线OFDM系统中信道反馈时延和多普勒频移所带来的信道估计误差对通信性能的影响。将信道估计误差等价为与信道参数相关的随机变量并通过Q函数的等效定义和OFDM系统中各子信道的同分步特性,推导出了多天线的OFDM系统误码率受信道反馈时延和多普勒频移影响的闭合表达式,同时仿真给出了三个发射天线、三个接收天线下的不同反馈时延和多普勒频移对通信误码率的影响,可为时变信道下的多天线OFDM系统设计提供参考。The impaction of delayed time and Doppler frequency shift in feedback channel on the system performance in OFDM system with multiple antenna is discussed. Through transforming the channel estimation error into a equivalent random variable and the equivalent definition of function, also using the identical property of sub-channels in OFDM system, the closed-form expression of Bit Error Rate with related to the feedback delayed time and Doppler shift is derived. Simulation also indicates the impaction of feedback delayed time and Doppler shift on performance in three transmit antennas and three receive antennas OFDM systems, which can provide a reference design in time varying channel of OFDM systems with multiple antenna.

关 键 词：多天线 正交频分复用 发射分集 波束成形 信道估计 

分 类 号：TN821[电子电信—信息与通信工程]