High-Sensitivity Detection Method for Signals in PhyC-SN

There are two methods of collision detection in the wireless physical quantity conversion lump-sum collection method (PhyC-SN), in which sensor information is converted into carrier waves for transmission: energy detection alone and the use of features that utilize energy detection and frequency offsets together. The detection accuracy is better when features utilizing frequency offsets are used than when energy detection is used alone. However, the frequency offset causes a loss of orthogonality between subcarriers, resulting in inter-carrier interference, which degrades the accuracy of collision detection. In this paper, we propose a collision detection method that suppresses the effects of inter-carrier interference by applying a window function to the transmitted carrier wave with multiple symbols.