Enhanced Sensitivity of Collision Detection by Carrier Frequency Offset Switching in Physical Wireless Parameter Conversion Sensor Networks

This study proposes a novel method for determining the number of simultaneously accessing sensors in physical wireless parameter conversion sensor networks (PhyC-SN), which can collect information from numerous simultaneously, using phase variation due to frequency offset as an identifier. However, identification accuracy deteriorates when offsets accessed are close each other. In proposed method, transmitted signal is divided by time and switched transmission. Computer simulations reveal that collision detection improves appropriate switches exist.