基于双门限的动态信道化子带频谱检测方法

Subband Spectrum Sensing of Dynamic Channelization Based on Double Thresholds

针对动态信道化接收中跨信道信号的信道检测判决问题,提出一种子带频谱检测方法。首先通过设置双能量检测门限检测出子带中的确定子带和不确定子带,然后利用平方谱对不确定子带进行再检,实现子带频谱的准确快速检测。仿真表明新方法较传统能量检测有较好的抗噪声性能,较循环特征检测有较低的运算复杂度,适合于性能要求较高且易于工程实现的动态信道化中的信道检测判决。

A method of subband spectrum sensing is proposed for broadband signal crossing channels in dynamic channelization. The decided subbands and doubtful subbands are detected by setting the double thresholds of power, and the doubtful subbands are detected further with their square spec- trums, while the subband spectrum sensing can be achieved accurately and fast. The simulation shows that the new method has better noiseproof performance than energy detection, and lower com- putational complexity than cyclic feature detection. The new method is suitable for dynamic channelization which requires better performance and easier hardware implementation.