MIMO SC-FDE系统的时域信道估计新算法  

Channel estimation for MIMO SC-FDE systems via time-domain based approaches

作　　者：李丹萍[1] 刘毅[1] 张海林[1] 

机构地区：[1]西安电子科技大学综合业务网与关键技术国家重点实验室,陕西西安710071

出　　处：《通信学报》2011年第2期144-149,共6页Journal on Communications

基　　金：高等学校创新引智计划基金资助项目(B08038);国家自然科学基金资助项目(61072069);中央高校基本科研业务费专项基金资助项目(72101855;72105377)~~

摘　　要：研究了循环正交训练序列的设计,并提出了适用于多入多出单载波频域均衡系统的时域信道估计新算法。首先选取Chu序列作为基准序列,并引入循环前缀与循环后缀构成循环正交序列,从而在接收端通过相关运算得到多天线信道的时域冲激响应估计。进一步,将长训练序列替换为多组连续重复且总长度相等的循环正交短训练序列,并利用时域相关和时间分集达到与原有长序列法相同的性能。仿真结果表明,所提时域信道估计算法不仅能够抑制天线间的干扰,而且有效地降低了噪声的方差,即使在低信噪比下也能获得较好的误比特率性能。Circularly orthogonal sequences were designed for the time-domain channel estimation in MIMO SC-FDE systems.Firstly,Chu sequences were chosen as the base sequences,which were added by cyclic prefix and cyclic postfix to construct circularly orthogonal training sequences.The channel impulse response can be estimated by calculating the cross-correlation between the received signal and the corresponding local sequence.Further,a new training sequence structure was presented,in which the original ＂long＂ training sequences were replaced by successive and identical ＂short＂ sequences.The corresponding estimation algorithm achieves the same performance as ＂long＂ sequences based method.Simulation results show that the proposed algorithms can offer good BER performance even at low SNR,due to the successful interference suppression between the antennas and the decrease in the noise variance.

关 键 词：循环正交序列 时域信道估计 时域相关 多入多出单载波频域均衡 

分 类 号：TN911.5[电子电信—通信与信息系统]