《计算机应用研究》|Application Research of Computers

基于循环自相关的NC-OFDM信号参数的盲估计

Parameter blind estimation based on cyclic autocorrelation of NC-OFDM signals

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作者 王胜,张天骐,袁帅
机构 重庆邮电大学 信号与信息处理重庆市重点实验室,重庆 400065
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文章编号 1001-3695(2019)05-043-1486-04
DOI 10.19734/j.issn.1001-3695.2017.11.0749
摘要 在认知无线电(CR)环境中,频率资源不足的问题越来越严重,而非连续正交频分复用(NC-OFDM)能够工作在非连续的频谱环境。针对NC-OFDM信号的参数估计问题,提出一种循环自相关的方法。该方法首先分析循环平稳信号特点,然后根据NC-OFDM信号的循环自相关,在循环频率α以及时延τ切面图具有离散谱线特征进行参数估计,最后对NC-OFDM信号的循环自相关进行数值仿真。仿真结果表明在低信噪比下,能有效估计NC-OFDM信号的参数及识别零前缀的正交频分复用信号(ZP-OFDM),且实验证明关闭近90%的子载波数目都能够实现NC-OFDM信号的参数的盲估计。
关键词 非连续正交频分复用; 认知无线电; 循环自相关; 参数盲估计; 零前缀的正交频分复用
基金项目 国家自然科学基金资助项目(61671095,61371164,61702065,61701067,61771085)
信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003)
重庆市研究生科研创新项目(CYS17219)
重庆市教育委员会科研项目(KJ1600427,KJ1600429)
本文URL http://www.arocmag.com/article/01-2019-05-043.html
英文标题 Parameter blind estimation based on cyclic autocorrelation of NC-OFDM signals
作者英文名 Wang Sheng, Zhang Tianqi, Yuan Shuai
机构英文名 Chongqing Key Laboratory of Signal & Information Processing,Chongqing University of Posts & Telecommunications,Chongqing 400065,China
英文摘要 In the cognitive radio(CR) environment, the problem of insufficient frequency resources gets severe, however non-continuous orthogonal frequency division multiplexing(NC-OFDM) can work in the non-continuous spectral environment. This paper proposed cyclic autocorrelation method to deal with the important problem of parameter estimation of NC-OFDM signals. Firstly, it analyzed the characteristics of cyclostationary of signals. Then according to the cyclic autocorrelation of the NC-OFDM signal, it estimated the parameters with the characteristics of the discrete spectral lines in the cyclic frequency α and the time delay τ cutaway. Finally, this paper simulated the cyclic autocorrelation of the NC-OFDM signals. The simulation results show that the parameters of NC-OFDM signal can be effectively estimated and recognized zero-prefix orthogonal frequency division multiplexing signals(ZP-OFDM) at low signal-to-noise ratio, and the experiments show that close to 90% of the number of subcarriers, can achieve NC-OFDM signals parameter blind estimation.
英文关键词 non-continuous orthogonal frequency division multiplexing(NC-OFDM); cognitive radio(CR); cyclic autocorrelation; parameter blind estimation; ZP-OFDM
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收稿日期 2017/11/30
修回日期 2018/1/10
页码 1486-1489
中图分类号 TN911.7;TP391
文献标志码 A