一种改进的线性调频信号多径时延估计算法
摘要
针对分数阶傅里叶变换(Fractional Fourier Transform, FRFT)对线性调频(Linear Frequency Modulation, LFM)信号进行多径时延估计时的不足,改进了一种基于时延功率谱特征的统计FRFT时延估计算法。改进算法通过建立由估计衰减系数的叠加值和估计时延组成的二维关系图,根据时延功率谱的分布特性剔除误估的虚假径,并按照衰减系数叠加值的大小顺序读取时延估计值。最后,以ITU-R M.1225中测试环境为室内办公室的一种信道模型为传输环境,对该算法进行了仿真验证。仿真表明,在计算复杂度仅增加7倍的条件下,改进的算法能够剔除使用FRFT算法估计时延时误估的虚假径,时延估计结果较FRFT算法更精确。
引文
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3俸玉祥,林基明,郑霖.基于正负斜率调频多带Chirp信号的移动目标参数估计[J].重庆邮电大学学报(自然科学版),2014,26(3):339-345.
4 Vangelista L.Frequency Shift Chirp Modulation:the LoRa Modulation[J].IEEE Signal Processing Letters,2017,24(12):1818-1821.
5 Mar J,Lin Y R,Yeh Y C.Ultra-wide bandwidth in-vehicle channel measurements using chirp pulse sounding signal[J].Iet Science Measurement&Technology,2009,3:271-278.
6粟严光,史杏荣.非点目标线性调频信号数字匹配滤波运算的计算机模拟[J].电子学报,1988,16(1):19-26.
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8 Ozaktas H M,Arikan O,Kutay M A,et al.Digital computation of the fractional Fourier transform[J].IEEE Transactions on Signal Processing,1996,44(9):2141-2150.
9李昕,李良光,姜媛媛.基于DFRFT的脉压方法及与匹配滤波性能对比[J].计算机工程与应用,2012,48(11):16-21.
10 Zhou Tian,Li Haisen,Zhu Jianjun,et al.Subsample time delay estimation of chirp signals using FrFT[J].Signal Processing,2014,96(5):110-117.
11王春阳,刘雪莲.分数阶Fourier变换在信号处理中的应用研究[J].长春理工大学学报:自然科学版,2015,38(5):1-8.
12 Bhat J S,Vijaya C.Sliding discrete fractional transforms[J].Signal Processing,2008,88(2):247-254.
13田达.非平稳信号阵列多参量估计技术研究[D].成都:电子科技大学,2004.
14 Shi Lei,Zhao Lei,Qiao Zhenyue,et al.A New Statistical WRELAX Algorithm Under Nakagami Multipath Channel Based on Delay Power Spectrum Characteristic[J].Wireless Personal Communications,2015,82(3):1483-1495.