| 引用本文: | 杨鹏,樊昀,黄知涛,等.基于Sub-Nyquist采样的单通道频谱感知技术.[J].国防科技大学学报,2013,35(4):121-127.[点击复制] |
| YANG Peng,FAN Yun,HUANG Zhitao,et al.Single-channel spectrum sensing technique based on sub-nyquist sampling[J].Journal of National University of Defense Technology,2013,35(4):121-127[点击复制] |
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| 基于Sub-Nyquist采样的单通道频谱感知技术 |
| 杨鹏1, 樊昀2, 黄知涛1, 柳征1, 姜文利1 |
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(1.国防科技大学 电子科学与工程学院，湖南 长沙 410073;2.北京947信箱，北京 100005)
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| 摘要: |
| 宽带频谱感知技术在认知无线电中具有广泛的应用。基于时分的思想，将信号采集时间以固定长度的时间片进行划分，分别与不同的伪随机码信号相乘，经过低通滤波和sub- Nyquist采样，利用采样数据求出信号的频率支集。与已有的多通道频谱感知结构相比，本文用相对简单的单通道结构实现，同样能够利用低速率的采样点完成频谱感知。仿真实验结果表明，在信号的频率支集未知的情况下，该算法能够有效利用sub-Nyquist采样的数据实现频谱感知。 |
| 关键词: 时分 sub-Nyquist采样 单通道 频谱感知 认知无线电 |
| DOI： |
| 投稿日期：2012-10-26 |
| 基金项目: |
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| Single-channel spectrum sensing technique based on sub-nyquist sampling |
| YANG Peng1, FAN Yun2, HUANG Zhitao1, LIU Zheng1, JIANG Wenli1 |
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(1.College of Electronic Science and Engineering, NUDT, Changsha 410073, China;2.Beijing 947 Mail Box, Beijing 100005, China)
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| Abstract: |
| Spectrum sensing technique for wideband analog signals has been applied widely in cognitive radio. Based on the idea of time-division, this study was conducted with the following steps. Firstly, sampling time was divided into time slices which have fixed length. Secondly, the signal was multiplied by a bank of periodic waveforms which are modulated by pseudorandom number generators, and the product is low-pass filtered and sampled at sub-Nyquist rate. Finally, the samples were used to evaluate frequency support. Compared with the multi-channel structure, the single-channel structure proposed here is much simpler and has the ability to spectrum sensing with low-rate samples. Numerical simulations show that this algorithm can effectively use samples sampling at sub-Nyquist rate to finish the task of spectrum sensing in scenarios that the spectral support is unknown in advance. |
| Keywords: time-division sub-Nyquist sampling single-channel spectrum sensing cognitive radio |
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