摘要：

基于IEEE 802.16d/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。

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

Abstract:

Aiming at the problem of guard sub carrier and non-2n 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.

Key words: Orthogonal Frequency Division Multiple Access(OFDMA), Discrete Fourier Transform(DFT), Least Squares(LS), Singular Value Decomposition(SVD)

中图分类号: 

• TN915