Wireless Powered and Backscattering Mobile Edge Computing Systems with Movable Antennas

This paper proposes a movable antenna (MA) empowered scheme for wireless powered and backscattering mobile edge computing (WPB-MEC) system. In the considered system, the access point (AP) transmits signals to enable wireless power transfer (WPT) to wireless devices (WDs) and passive offloading from the WDs to the MEC server. Moreover, the WDs are capable of actively offloading their tasks to the MEC server based on the previously harvested energy. The MAs are deployed at the AP and MEC server to improve the efficiency of WPT and hybrid offloading by flexibly adjusting their positions within an available area. Under this setup, we formulate a sum computational bits (SCBs) maximization problem and propose a block coordinate descent based optimization framework with the successive convex approximation method and the genetic algorithm based particle swarm optimization algorithm to find its accurate solution. Numerical results verify that utilizing the MAs can improve up to 81.77% SCBs compared to the scheme with fixed position antennas.