| 摘要: |
| 针对OFDM系统的特点,介绍了一个新的频谱侦听方法,它充分利用了正交频分复用符号中的循环前缀和空闲时间来提高侦听精度。通过建立OFDM收发双方的信号模型,以能量检测的方法为基础,分析并仿真了这种新方法的性能,结果表明,与传统的只利用空闲时间的侦听方法相比,提出的方法能有效提高侦听精度。 |
| 关键词: OFDM,认知无线电,频谱侦听,循环前缀 |
| DOI： |
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| 基金项目: |
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| Spectrum Sensing Scheme Based on Cyclic Prefix for OFDM Cognitive Radio Systems |
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| Abstract: |
| This paper introduces a novel spectrum sensing scheme for OFDM-based system,which exploits the cyclic prefix of an orthogonal frequency-division multiplexing(OFDM) symbol as well as idle period containing no information symbols.It analyzes and simulates the performance of this new scheme through modeling signals of receiver and transmitter,and on the basis of energy detection.The result shows that the introduced scheme can improve the sensing accuracy compared with the conventional scheme. |
| Key words: OFDM,cognitive radio,spectrum sensing,cyclic prefix |
