基于DFT的时域LS信道估计算法  

DFT-based Channel Estimation Algorithm of Time Domain LS

作　　者：卢鑫[1] 蔡铁[1] 徐骏[2] 

机构地区：[1]深圳信息职业技术学院信息技术研究所,深圳518029 [2]中兴通讯股份有限公司移动事业部,深圳518057

出　　处：《计算机工程》2010年第11期11-13,共3页Computer Engineering

基　　金：国家自然科学基金资助项目(60672150);广东省自然科学基金资助项目(8151802904000012)

摘　　要：基于IEEE802.16d/e标准的OFDMA系统中存在保护子载波和导频非2n等间隔插入,针对该问题,提出一种基于DFT的时域LS信道估计算法。该算法对相比信道自相关矩阵R容易获得的矩阵T进行奇异值分解(SVD),得到基于DFT的低阶近似。仿真结果表明,该算法的信道估计性能和运算复杂度介于LMMSE-SVD算法、IFFT/FFT算法之间,对导频要求更宽松,应用更广泛。Aiming at the problem of guard sub carrier and non-2^n interval pilot insertion for OFDMA system based on IEEE 802.16d/e standard, this paper presents a DFT-based time domain LS channel estimation algorithm. A low-rank approximation estimator based on DFT is derived through the Singular Value Decomposition（SVD） process of matrix T, and matrix T is easier to get than autocorrelation matrix R. Simulation results show that the channel estimation performance and computational complexity of this algorithm are between LMMSE-SVD algorithm and IFFT/FFT algorithm, but the requirement for pilot is less critical of this algorithm, and the scope of application is more widely.

关 键 词：正交频分多址接入 离散傅里叶变换 最小二乘 奇异值分解 

分 类 号：TN915[电子电信—通信与信息系统]