中文摘要：

基于认知无线电（CR）技术的电力物联网（IOTIPS）通过频谱感知实现对空闲授权频段的接入，可以有效提高频谱利用率，由于电力物联网的通信环境复杂，载波频偏无法避免，提出一种适用于电视频段授权用户数字地面多媒体广播（DT—MB）的复合相关检测算法，可以在大载波频偏条件下保持对DTMB信号稳定的检测性能，提升了通信网络的可靠性。同时基于复合相关检测的协作频谱感知，可以有效降低隐藏终端对感知性能的不利影响，提高认知电力物联网的通信效率。

英文摘要：

Based on Cognitive Radio （CR）, the IOTIPS implements spectrum sensing（SS） to access idle TV bands to communicate, which can effectively solve the spectral scarcity. However, because the communication environment of the IOTIPS is complex, the carrier frequency offset（CF0） can not be avoided. In this paper, a composite correlation based waveform detection（ CC- WD） algorithm for digital terrestrial multimedia broadcasting（DTMB） signal is proposed, which can maintain stable detection per- formance against large CFO and enhance the reliability of communication network. Based on the CC-WD, the cooperative spectrum sensing can effectively reduce the adverse impact on the perception of hidden terminal based on performance, effectively improve the efficiency of IOTIPS.