摘要
针对无线局域网(WLAN)信号物理层调制质量测试需求,研究了基于IEEE802.11a标准的WLAN信号解调方法,设计了一套完整的WLAN信号解调算法流程。该算法首先基于短训练序列实现帧起始位置确定,其次利用长训练序列进频偏估计,并消除载波频差,然后通过解析信号域得到调制类型及数据长度等调制参数,再利用长训练序列进行信道估计以进行信道均衡,并利用相位跟踪改善解调效果。该算法可采用纯软件实现,适合应用于信号分析仪等测量仪器,可以实现对WLAN信号物理层的调制质量测试。最后经过采集数据实验验证该算法可有效实现IEEE802.11a标准WLAN信号的解调。
For the demand of WLAN signal physical layer modulation quality test,the WLAN signal demodulation method based on IEEE802.11a standard is studied,and a complete set of WLAN signal demodulation algorithm is designed.Firstly,the starting position of the frame based on delay correlation algorithm of short training sequence is determines in this algorithm.Secondly,the long training sequence is used to estimate the frequency offset and eliminate the carrier frequency deviation.Then the modulation parameters such as modulation type and data length are obtained by analyzing the signal domain.The long training sequence is used for channel estimation to equalize the channel and phase tracking is used to improve the demodulation quality.The algorithm can be implemented by pure software,and is suit for signal analyzer and other measuring instruments,and can achieve the physical layer modulation quality test of WLAN signal.Finally,the experiment base on sampled data shows that the algorithm proposed in this paper can effectively demodulate the WLAN signal based on IEEE802.11a standard.
作者
韩翔
周钦山
王峰
Han Xiang;Zhou Qinshan;Wang Feng(China Electronics Technology Instruments Co.,Ltd.,Qingdao 266555,China)
出处
《国外电子测量技术》
北大核心
2021年第3期103-107,共5页
Foreign Electronic Measurement Technology
