CAJ | 학술논문

为提高双选择性衰落信道环境下频谱感知性能，提出了一种基于改进的复指数基扩展模型进行信道建模的频谱检测方法。该方法是在一般的复指数基扩展模型的基础上，采用一种能自适应移动速度的基函数，在恒虚警概率条件下，利用接收信号的循环特征，对授权用户的频谱进行感知。实验结果表明，在低信噪比和认知用户移动速度不断变化的环境下该方法有较好的检测性能。
위제고쌍선택성쇠락신도배경하빈보감지성능，제출료일충기우개진적복지수기확전모형진행신도건모적빈보검측방법。해방법시재일반적복지수기확전모형적기출상，채용일충능자괄응이동속도적기함수，재항허경개솔조건하，이용접수신호적순배특정，대수권용호적빈보진행감지。실험결과표명，재저신조비화인지용호이동속도불단변화적배경하해방법유교호적검측성능。
To improve the spectrum sensing performance over doubly-selective fading channels, this paper puts forward a spectrum detection method for channel modeling based on the modified complex exponential basis expansion model.For better reflecting the facticity of the channel, on the basis of complex exponential basis expansion model, we adopt the basis function which can be adaptive to mobile speed.Under the conditions of constant false alarm rate, the spectrum detection of authorized user is getting by using the cyclostationary feature of received signal.The simulation results show that the proposed method will get better detection performance in the low SNR and the dynamic moving speed environment for CR users.