摘要
在具有零中频架构收发机的正交频分复用(OFDM)系统中,接收机解调性能通常会受到载波频率偏移、收发机IQ失配和直流偏置(DCO)的影响。其中直流偏置直接影响频偏的估计并使帧检测变得困难,针对这一现象提出了一种基于多段重复前导序列的双搜索窗分段延迟相关帧检测算法。该算法相比传统直流偏置估计和补偿算法而言,实时性强、复杂度低、实现简单,且采用自相关运算,能在大频偏环境下正常工作。仿真搭建含有直流偏置的多径信道模型,在接收端抓取信号经过射频电路后在多径信道下产生的基带信号并对算法进行性能测试,结果表明,相比于性能较好的OFDM帧检测算法,该算法具有较低的误检率和漏检率。
In Orthogonal Frequency Division Multiplexing(OFDM)systems with zero-IF architecture transceivers,demodulation performance of the receiver is typically affected by carrier frequency offset,transceiver IQ mismatch,and DC Offset(DCO).The DCO directly affects the estimation of frequency offset and makes frame detection difficult.Aiming at this phenomenon,a dual-search window segment-delay correlation frame detection algorithm based on multiple repeated preamble sequences is proposed.Compared with the traditional DC offset estimation and compensation algorithm,the algorithm has strong real-time performance,low complexity,simple implementation,and adopts autocorrelation operation,which can work normally in the environment of large frequency offset.The simulation builds a multipath channel model with DC bias,and the receiver captures the baseband signal generated in the multipath channel after the signal passes through the RF circuit and the performance of the algorithm is tested.The results show that the algorithm has lower false detection rate and missed detection rate than the better performance OFDM frame detection algorithm.
作者
张骏驰
杨竞舟
张暘
李大鹏
杨锦彬
ZHANG Junchi;YANG Jingzhou;ZHANG Yang;LI Dapeng;Yang Jinbin(School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;CETC Advanced Mobile Communication Innovation Center,Nanjing 210019,China)
出处
《无线电通信技术》
2022年第5期904-911,共8页
Radio Communications Technology
