基于频偏和IQ不平衡估计的上行导频设计  

Uplink pilot design based on frequency offset and IQ unbalance estimation

作　　者：张伽俐 施苑英 王选宏 Zhang Jiali;Shi Yuanyin;Wang Xuanhong(School of Communication and Information Engineering,Xi′an University of Posts and Telecommunications,Xi′an 710121,China)

机构地区：[1]西安邮电大学通信与信息工程学院,陕西西安710121

出　　处：《电子技术应用》2018年第9期108-111,共4页Application of Electronic Technique

摘　　要：针对OFDM系统中IQ不平衡与载波频偏导致误码率急剧增加的问题,提出一种与上行LTE的DMRS信号兼容的导频信号设计。该导频信号可以替换DMRS信号进行信道矩阵估计,并且能够实现频偏估计和IQ不平衡参数估计,在不增加导频开销和系统复杂度的情况下提升了系统对IQ不平衡与载波频偏的容忍度。仿真结果表明,该导频信号不仅可以准确地估计出频率偏移和IQ不平衡参数,而且可以取得良好的频域均衡效果。In order to solve the problem that the IQ imbalance and carrier frequency offset cause a sharp increase of BER in OFDM system,a pilot signal design compatible with DMRS signal of uplink LTE is proposed.The pilot signal can replace the DMRS signal for channel matrix estimation,and also can realize frequency offset estimation and IQ unbalance parameter estimation,which improves the tolerance of the system to IQ imbalance and carrier frequency offset without increasing pilot overhead and system complexity.The simulation results show that the pilot signal can not only accurately estimate the frequency offset and IQ unbalanced parameters,but also achieve a good frequency domain equalization effect.

关 键 词：频偏估计 CFO IQ不平衡 信道估计 DMRS 上行LTE 

分 类 号：TN911.3[电子电信—通信与信息系统]