摘要
为解决异步多用户长码直扩信号波达方向估计困难的问题,假设信源数已知,提出用相干信号子空间算法和高阶累积量算法估计异步LC-DS-CDMA信号的波达方向的方法。两种算法的核心思想都是把信号变换到频域,分成窄带信号,把方向矩阵变换到同一频率,用MUSIC算法估计波达方向。仿真结果表明,在信噪比大于-10dB时,两种算法的成功率达到95%以上,能够实现异步LC-DS-CDMA信号的波达方向估计。
To solve the problem of direction estimation of asynchronous multi-user long code direct spread signal,a direction estimation algorithm using coherent signal subspace algorithm and high order cumulant algorithm to estimate direction of arrival of asynchronous LC-DS-CDMA signal was proposed.Assuming that the number of sources was known,the core idea of both algorithm was to transform the signal into the frequency domain,divide it into narrow-band signals,transform the direction matrix to the same frequency,and use the MUSIC algorithm to estimate the direction of arrival.Simulation results show that the success rates of the two algorithms are over 95%when the SNR is greater than-10 dB,indicating that both algorithms can estimate the direction of arrival of asynchronous LC-DS-CDMA signals.
作者
李鑫凯
张天骐
梁先明
LI Xin-kai;ZHANG Tian-qi;LIANG Xian-ming(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Southwest Institute of Electronic Technology,Chengdu 610036,China)
出处
《计算机工程与设计》
北大核心
2020年第7期1846-1851,共6页
Computer Engineering and Design
基金
国家自然科学基金项目(61671095、61702065、61701067、61771085)
信号与信息处理重庆市市级重点实验室建设基金项目(CSTC2009CA2003)
重庆市研究生科研创新基金项目(CYS17219)
重庆市教育委员会科研基金项目(KJ1600427、KJ1600429)。
