Dedicated Energy Beamforming in Distributed Antenna Systems Using Antenna-Group Common Reference Signals

Abstract

A reference signal allocation scheme is described for dedicated energy beamforming in distributed wireless energy transfer. By allocating a common reference signal to multiple antennas as far apart as possible while preserving the randomness of the allocations, we aim to reduce the overhead of the frame structure, avoid the occurrence of long-lasting radio field strengths elsewhere, and reduce the computational complexity at the receiver. Our simulation results demonstrated that dedicated energy beamforming from an antenna-group subset was able to track the channel phase variations induced by a maximum velocity of 2.0 m/s and provided longer duration of high received power than per-antenna reference signal allocation.