摘要
针对频率选择性信道下基于正交频分复用(OFDM,orthogonal frequency division multiplexing)技术的多节点放大转发(AF,amplify-and-forward)协作通信,提出了一种基于训练序列的最小二乘信道估计方法,推导出其均方误差性能的下界并给出了相应的最优训练序列方案。同时,该方法选取经功率分配优化后具有恒幅特性的Chu序列作为训练序列,实现了多节点AF协作通信中信道估计的最小均方误差。仿真结果证实了该信道估计方法在多节点AF协作通信环境下的有效性以及所提最优训练序列方案在系统性能上的优越性。
A training sequence aided least squares channel estimation method was proposed for orthogonal frequency division multiplexing （OFDM） based multi-node amplify-and-forward （AF） cooperative communication over frequency-selective fading channels. The mean square error bound on the proposed method is derived and the optimal training sequence scheme with respect to this bound is also given. In addition, Chu sequence with the optimal power allocation is chosen as training sequence to achieve the minimum mean square error estimation performance. Simulation results confirm the performance of the proposed channel estimation method in multi-node AF cooperative communication scenarios and the superiority of the derived optimal training sequence scheme.
出处
《通信学报》
EI
CSCD
北大核心
2008年第2期123-128,133,共7页
Journal on Communications
基金
国家高技术研究发展计划("863"计划)基金资助项目(2006AA01Z216)~~
关键词
协作分集
信道估计
放大转发
正交频分复用
分布式空时码
cooperative diversity
channel estimation
amplify-and-forward
OFDM
distributed space-time code
