基于VSCBOMP算法的FBMC/OQAM系统信道估计  

FBMC/OQAM system channel estimation based on VSCBOMP algorithm

作　　者：季策 田博彦[1] 耿蓉 李伯群 JI Ce;TIAN Boyan;GENG Rong;LI Boqun(School of Computer Science and Engineering,Northeastern University,Shenyang 110169,China;Key Laboratory of Intelligent Computing in Medical Image,Ministry of Education,Northeastern University,Shenyang 110169,China;School of Electronic and Information Engineering,University of Science and Technology Liaoning,Anshan 114051,China)

机构地区：[1]东北大学计算机科学与工程学院,辽宁沈阳110169 [2]东北大学医学影像智能计算教育部重点实验室,辽宁沈阳110169 [3]辽宁科技大学电子与信息工程学院,辽宁鞍山114051

出　　处：《系统工程与电子技术》2023年第4期1193-1199,共7页Systems Engineering and Electronics

基　　金：中央高校基本科研业务费(N2116015,N2116020)资助课题。

摘　　要：偏移正交调制的滤波器组多载波(filter bank multi-carrier/offset quadrature amplitude modulation,FBMC/OQAM)相比于传统正交频分复用(orthogonal frequency division multiplexing,OFDM)系统具有误码率低、频谱利用率高等优点,但目前较少有采用压缩感知方法来进行FBMC/OQAM的信道估计的研究。针对FBMC/OQAM系统提出基于变步长条件回溯正交匹配追踪(variable step-size conditional backtracking orthogonal matching pursuit,VSCBOMP)的信道估计算法。该算法在每次迭代过程中选择多个原子,当支撑集充满之后,利用回溯剔除相关性较差的原子。同时,加入了变步长的思想,提高了运算效率。在随后的稀疏随机信号恢复实验及FBMC/OQAM系统信道估计仿真实验中验证了该算法。仿真结果表明,该算法比传统的正交匹配追踪类算法运行时间短,亦能获得更高的估计精度。Compared with conventional orthogonal frequency division multiplexing(OFDM)systems,filter bank multi-carrier/offset quadrature amplitude modulation(FBMC/OQAM)has the advantages of low bit error rate and high spectrum efficiency,but there are few studies on the use of compressive sensing in order to estimate FBMC/OQAM channels recently.A channel estimation algorithm named variable step-size conditional backtracking orthogonal matching pursuit(VSCBOMP)is proposed for FBMC/OQAM systems.This algorithm selects several atoms in each iteration and backtracks when the support set is full in order to get rid of atoms with poor correlation.The idea of variable step-size is added simultaneously to improve the operation efficiency.The algorithm is then simulated in sparse random signals recovery experiment and channel estimation in FBMC/OQAM systems.The simulation result proves that the algorithm has shorter running time and higher estimation accuracy than conventional orthogonal matching pursuit algorithms.

关 键 词：偏移正交调制的滤波器组多载波 信道估计 压缩感知 变步长 回溯 

分 类 号：TN911.7[电子电信—通信与信息系统]