摘要
在MIMO-OFDM系统中,每个接收天线上的信号都是多个发送天线信号的叠加,再加上多径的影响,使得帧同步比一般OFDM系统更加困难,为此提出了一种改进的用于MIMO-OFDM帧同步和载波频偏估计的正交帧头结构.通过在时域直接生成同步帧头,并在频域修正其频域特性,这种正交帧头能够区分每个发送天线到接收天线的不同到达时间,是通常的时域生成的正交帧头的改进,在保证时域正交性的同时,又具有良好的频域特性,有利于数字上变频.Matlab仿真结果表明,这种改进的帧头结构在帧同步和载波频偏估计中都有很好的性能.
Frame synchronization in MIMO-OFDM （multi input multi output-orthogonal frequency division multipluxing） systems is more difficult than in OFDM systems because one receive antenna will get several waveforms from different transmit antennas. Furthermore, those waveforms will be degraded by multipath delay. An improved preamble structure for MIMO OFDM frame synchronization and carrier frequency offset estimation was presented. The orthogonal preamble for frame synchronization makes it possible that a receive antenna can distinguish the fine arriving time of different signals from different transmit antennas. The preamble is not only orthogonal in time domain, but alsohas a fine characteristic in frequency domain. Simulation results show that the preamble structure has good performance both in frame synchronization and carrier frequency offset estimation.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2006年第2期254-257,261,共5页
Journal of Zhejiang University：Engineering Science
