LTEA 基于压缩感知的信道估计.pdf

doi:. 无线通信技术LTE-A 基于压缩感知的信道估计王波,李贵勇(重庆邮电大学通信与信息工程学院,重庆 400065)摘要:针对在多普勒环境下 LTE-A(改进的长期演进)系统时频域二维稀疏信道的特性,根据导频在时频域的分布以及二者之间的相关性,通过将搜索空间分解为时域上 OFDM(正交频分复用)符号间和频域上子载波间范围,提出了一种基于 OMP(正交匹配追踪)算法改进压缩感知的信道估计。仿真结果表明,改进的 OMP 算法较原始算法具有更低的 MSE(均方误差)。关键词:压缩感知;信道估计;正交匹配追踪中图分类号: 文献标志码:A 文章编号:1005-8788(201 5)01-0072-pressed sensing-based channel estimation for LTE-A systemsWang Bo,Li Guiyong(School munication and Information Engineering,Chongqing Universityof Posts and munications,Chongqing 400065,China)Abstract:In view of the characteristics of the two-dimensional sparse channel of the time and frequency domains of the LTE-Asystems in Doppler environment and in line with the distribution of pilot in the time and frequency domains and its correlationwith them,this paper presents an Orthogonal Matching Pursuit (OMP)algorithm-based pressed sensing channelestimation by posing the search space into ranges between OFDM symbols in time domain and between subcarriers in fre-quency results show that the improved OMP algorithm has still lower Mean Square Error (MSE)than theoriginal pressed sensing;channel estimation;OMP0 引言无线信道存在天然的稀疏性,可以利用的有效径较少,但利用这种天然的稀疏性,可以通过较少导频数获取有用信息,因此国内外专家开始着力于基于压缩感知的信道估计的研究。压缩感知理论[1]是由 Tao(陶哲轩)、Candes 和 Donoho 三人提出的,该理论突破了奈奎斯特采样定律的条件限制。目前常用的压缩感知信道估计算法有 BP(基追踪)算法[2]、MP(匹配追踪)算法[3]和 OMP(正交匹配追踪)算法[4]。文献[5]提出了一种利用 MP 算法的压缩