DFT-SOFDM系统的导频辅助信道估计方法  

Pilot Symbols Aided Channel Estimation Scheme for DFT-SOFDM Systems

作　　者：蒋贵全[1] 聂永萍[1] 

机构地区：[1]重庆邮电大学计算机学院,重庆400065

出　　处：《压电与声光》2007年第2期227-229,239,共4页Piezoelectrics & Acoustooptics

基　　金：重庆市科委自然科学基金计划基金资助项目(CSTC2006BB2371)

摘　　要：离散傅里叶变换扩频正交频分复用(DTF-SOFDM)技术是未来移动上行链路的候选技术,它的精确信道估计是提高系统通信质量的有效方法。在信道估计方法中,最小均方误差(MMSE)算法虽然具有较高的信道估计精度,但由于涉及到二维变量的求极值和矩阵求逆,故运算复杂度较高。考虑到降低实现的复杂度,我们采用导引符号辅助的、结合快速傅里叶变换(FFT)的二维(时域,频域)线性内插信道估计方案。通过仿真验证了这种方法的可行性。Discrete Fourier transform and spread orthogonal frequency division multiplex （DFT-SOFDM） technique is important candidate technology for future mobile communication systems, whose excellent channel estimation is efficient for improving quality of service. In general, minimum mean square error （MMSE） channel estimations are good for system performance but with high complex to implement in systems because the MMSE algorithm need inverse of matrix and compute 2-dimenstion limited variables. In this paper, a pilot symbols aided channel estimation is proposed, which is combined with fast Fourier transform （FFT） and 2-dimentsion linear insert to obtain excellent channel permanents, and the novel systems performance is confirmed by computer simulation.

关 键 词：扩频正交频分复用 信道估计 导引符号 

分 类 号：TN92[电子电信—通信与信息系统]