In this article, we suggest a new Spectrum Sensing (SS) algorithm using Incremental Relaying (IR). In previous studies, the relays always cooperate in the SS process. However, sometimes the Signal to Noise Ratio (SNR) of the direct link between the Primary User (PU) and the Fusion Node (FN) is high and cooperation is not required. We suggest to activate the relays only when the SNR of direct link is lower than a predefined threshold T. Otherwise, the relays should be idle. In the proposed SS algorithm with IR, all relays can amplify the PU signal to FN only when the SNR of direct link is lower than T. We can also implement IR with relay selection techniques. When the SNR of direct link is lower than T, we select the best relay. Three relay selection algorithms are investigated such as opportunistic amplify and forward, partial and reactive relay selection.

在本文中，我们建议使用增量中继（IR）的新频谱感知（SS）算法。在以前的研究中，继电器始终在SS过程中协同工作。但是，有时主用户（PU）与融合节点（FN）之间的直接链路的信噪比（SNR）高，因此不需要合作。我们建议仅在直接链路的SNR低于预定义的阈值T时才激活继电器。否则，继电器应处于空闲状态。在提出的带有IR的SS算法中，只有当直接链路的SNR低于T时，所有继电器才能将PU信号放大到FN。我们还可以使用继电器选择技术来实现IR。当直接链路的SNR低于T时，我们选择最佳中继。研究了三种继电器选择算法，例如机会放大和正向，部分和无功继电器选择。