快变信道环境下OFDM频谱感知算法Spectrum sensing algorithm of OFDM signal in fast-varying channel environment
李月贞,陈少平
摘要(Abstract)：
针对基于慢变信道假设的认知无线电不适合高速移动场景的问题,提出一种基于广义似然比的OFDM频谱感知算法。利用OFDM信号自身相关性得到OFDM检测统计量,通过研究其统计分布特性得到OFDM广义似然比检测统计量,构建快变信道检测模型进行频谱感知。在原算法的基础上,用检测窗口的宽度近似替代检测统计量的方差,得到广义似然比的改进算法。仿真结果表明,两种感知算法在低信噪比、快变信道环境中都具有很高的认知度,而且改进算法对噪声和干扰还具有很好的鲁棒性。
关键词(KeyWords)： 快变信道;正交频分复用;广义似然比;循环前缀;频谱感知;认知无线电
基金项目(Foundation): 国家自然科学基金资助项目(60772031)~~
作者(Author): 李月贞,陈少平
DOI: 10.16652/j.issn.1004-373x.2018.07.001
参考文献(References)：
- [1]刘乐,陈瑾.基于OFDM频域内插导频的循环平稳特征频谱感知方法研究[J].现代导航,2015(1):65-70.LIU Le,CHEN Jin.Study on cyclostationary-based spectrum sensing algorithm based on embedded pilots of OFDM signal[J].Modern navigation,2015(1):65-70.
- [2]AMIRI I S,ALAVI S E,SOLTANIAN M R K,et al.2×2 MIMO-OFDM-Ro F generation and transmission of double V-band signals using a microring resonator system[J].Applied optics,2016,48(1):1-15.
- [3]XU T,MIKROULIS S,MITCHELL J E,et al.Bandwidth compressed waveform for 60-GHz millimeter-wave radio over fiber experiment[J].Journal of lightwave technology,2016,34(14):3458-3465.
- [4]HUANG G,TANG D.Wireless information and power transfer in two-way OFDM amplify-and-forward relay networks[J].IEEE communications letters,2016,20(8):1563-1566.
- [5]MA T H Z.Proposed OFDM modulation for future generations of GNSS signal system[J].Journal of navigation,2016,1(5):971-990.
- [6]USMAN M,HAR D,KOO I,et al.Energy-efficient infrastructure sensor network for Ad Hoc cognitive radio network[J].IEEE sensors journal,2016,16(8):2775-2787.
- [7]ALI A,HAMOUDA W.Spectrum monitoring using energy ratio algorithm for OFDM-based cognitive radio networks[J].IEEE transactions on wireless communications,2015,14(4):2257-2268.
- [8]CHIN W L,KAO C W,QIAN Y.Spectrum sensing of OFDM signals over multipath fading channels and practical considerations for cognitive radios[J].IEEE sensors journal,2016,16(8):2349-2360.
- [9]SHI Z,MCLERNON D,GHOGHO M,et al.Improved spectrum sensing for OFDM cognitive radio in the presence of timing offset[J].EURASIP journal on wireless communications and networking,2014(1):224-233.
- [10]ONET R,NEAG M,KOVACS I,et al.Compact variable gain amplifier for a multistandard WLAN/Wi MAX/LTE receiver[J].IEEE transactions on circuits&systems,2014,61(1):247-257.
- [11]PONKUMAR D D N.An efficient dynamic fuzzy based priority scheduler for mobile Wi MAX[J].International journal of applied engineering research,2015,10(7):17711-17720.