频谱感知技术在认知无线电中的应用

频谱感知是认知无线电的关键技术，能量检测广泛应用于频谱感知。针对认知无线电频谱感知技术较少运用于实践的不足，提出了基于0FDM传输系统的频谱感知。在0FDM系统中利用能量检测的判决结果控制子载波的开关，实现感知结果对数据传输的控制，最后利用认知无线电平台进行实时数据的传输。实验结果表明，系统能够在认知无线电平台上成功进行无线通信的数据发送与接收，频谱感知结果能够有效控制数据传输，为认知无线电由理论研究步向实际应用奠定了基础，具有一定的实用价值。

The Application of Spectrum Sensing Techniques in Cognitive Radio

Spectrum sensing is one of the key technologies in Cognitive Radio. Energy detec- tion is widely used in this area. Spectrum sensing technology is less used in practice. Con- cerning this shortcoming, this paper introduces a module based on OFDM technology. Sub- carriers are controlled by the results of energy detection. Data are transmitted by the US- RP2 if subcarriers work. The experiment results indicate that this system is available to im- plement the wireless communication based on the USRP2. Spectrum sensing results could effectively control the data transmission, which presents foundation to converting the theory study to the practical application of CR. This system is of some practical value.