Analysis of Spread Spectrum Pilot Signals to Suppress Co-Channel Interference for Microwave Power Transfer

We aim for the non-cooperative coexistence of colocated independent microwave power transfer (MPT) systems in the same frequency channel. When energy transmitters and receivers from independent MPT systems are in close proximity, co-channel interference occurs between a pilot signal for channel estimation and a power transmission signal or between pilot signals, which in turn reduces the power transmission efficiency. This study investigates spread spectrum pilot signals to suppress the co-channel interference between MPT systems. The simulation and experimental results demonstrate the effectiveness of the spread spectrum pilot signals and confirm the superiority of the frequency hopping spread spectrum technique.