摘要
频谱感知是提高MIMO-TDCS(Multiple-Input Multiple-Output,MIMO;Transform Domain Communication System,TDCS)通信性能的关键技术,是当前的研究热点,针对当前MIMO-TDCS频谱利用率低的缺陷,提出一种新型的MIMO-TDCS频谱感知方法。首先对工作原理进行阐述,并建立MIMO-TDCS的数学模型,然后采用低于乃奎斯特速率对信号进行采样,并用正交匹配追踪算法对信号进行重构,对信号进行有效消除,消除干扰音对频谱感知的不利影响,最后与经典MIMO-TDCS频谱感知方法进行对比测试,结果表明,该方法有效降低了误码率,提高了频谱利用率,可以很好的实现信号恢复。
Spectrum sensing is the key technology to improve the communication performance of MIMO- TDCS, and it is the focus in current research. The utilization rate of current spectrums is low, and this paper puts forward a new spectrum sensing method for MIMO-TDCS. Firstly, the working principle is described, and the mathematical model of MIMO-TDCS is established. Secondly, lower Nyquist rate is used to sample the signal, and then the orthogonal matching pursuit algorithm is used to reconstruct the original signal and eliminate noise. Finally the simulation experiments are carried out to test the performance with the classical MIMO-TDCS spectrum sensing methods. The results show that, the proposed method effectively reduces the error rate, improves the spectrum utilization efficiency, and can realize a good signal recovery.
出处
《控制工程》
CSCD
北大核心
2016年第11期1831-1835,共5页
Control Engineering of China
关键词
变换域通信系统
正交匹配追踪
多输入多输出
抗干扰
误码率
频谱感知
Transform domain communication system
orthogonal matching pursuit
MIMO
anti-jamming
symbol error rate
spectrum sensing
