摘要
推导了MIMO-OFDM信道估计MSE最小准则下训练序列的最优化条件和最优化结构,提出了一种最优化训练序列.这一序列结合了CDM,FDM与TDM训练结构,保证了不同发射天线的导频符号在空、时、频三维空间上相互正交,从而有效地消除了天线间的信号干扰,降低了信道估计的复杂度.同时,它的导频结构灵活,可以根据信道环境、系统参数以及系统性能要求进行适当选取,因而具有广泛的适用性.
The problem of optimal training design for channel estimation in MIMO-OFDM systems is investigated. The optimality condition and training structure based on minimizing the channel estimation MSE is analyzed, and a new training sequence is presented. This sequence combines the optimal structures of frequency division multiplexing, time division multiplexing and code division multiplexing, and retains the orthogonality in the time domain, frequency domain and space domain, thus decreasing the effect of the multiple antennas interference and reducing the channel estimation complexity effectively. With a flexible structure, it can be transformed according to channel environment, system parameters, system performance, etc.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2008年第6期978-982,共5页
Journal of Xidian University
基金
高等学校学科创新引智计划资助(B08038)
国家自然科学基金资助(J60104010107)
"863"计划资助(B50306290182)
关键词
多输入多输出-正交频分复用
训练序列
时分复用
频分复用
码分复用
MIMO-OFDM
training sequence
time division multiplexing
frequency division multiplexing
code division multiplexing
