机构地区: 深圳信息职业技术学院
出 处: 《计算机工程》 2010年第11期11-13,共3页
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.