Retrodirective Large Antenna Energy Beamforming in Backscatter Multi-User Networks

Retrodirective Large Antenna Energy Beamforming in Backscatter Multi-User Networks

In this letter, we study a new technique for energy beamforming (EB) in multi-user networks, which combines large antenna retrodirectivity at the transmitter side with signal backscattering at the energy receivers. The proposed technique has low complexity and achieves EB without any active operation at the receivers or complicated signal processing techniques at the transmitter. Since the aver...

User and Antenna Joint Selection in Multi-User Large-Scale MIMO Downlink Networks

Retrodirective Antenna Systems for Wireless Communications

This paper presents an overview of retrodirective antenna systems developed for use in wireless communications. This multiple antenna system automatically reflects incident radiation in the direction of the source radiator by re-transmitting the phase conjugate of the received signal at each antenna. The overall system behaves as a directional antenna with omni-directional coverage and allows t...

Distributed Beamforming Using Multi-Antenna Backscattering Network

This paper proposes two novel beam-forming methodologies, which employ passive RF devices to enhance received signal through a passive, scattering based beam forming. Currently available backscattering systems, e.g. the radio frequency identification (RFID), suffer from a poor communication in an environment with multiple passive devices. The intermediate antennas create severe scattering envir...

Joint Multicast Beamforming and User Scheduling in Large-scale Antenna Systems

This paper studies the joint multicast beamforming and user scheduling problem, with the objective of minimizing total transmitting power across multiple channels by jointly assigning each user to appropriate channel and designing multicast beamformer for each channel. The problem of interest is formulated in two different optimization problems, a mixed binary quadratically constrained quadrati...