second order spectrum

Therefore, second order sampling at above the theoretical minimum rate is presented in this paper, and guard band will be included between positions of shifted spectrum components.

本文以大于理论上的最小采样频率进行二阶采样，使信号频谱的迁移项间有一定的保护带，并且得到了一种简化的二阶采样重建公式。

In the second method, we check the idle channel in the macro cellular network through the spectrum sensing technology. Then we let the users of the femtocell use these channels by the priority order.

在第二种方法中，通过频谱感知技术检测宏蜂窝网络中的空闲信道，然后让家庭基站用户根据优先级使用这些信道。

SU ( 1, 1) Spectrum Generating Algebra and The Spectrum of Ordinary Differential Equation of the Second Order

su（1,1）谱生成代数与二阶常微分方程的谱