Disclosed are passive reflector radio communications systems, such as for UHF frequencies or greater than UHF frequencies, and related deployment systems and devices that provide underground communications. Embodiments of the system include reflector elements to provide passive radio communications, structural frameworks to support and orient the reflector elements, methods for calculating reflector size, shape, and position corresponding to a desired wavelength, and deployment methods and devices to install the communication system at a desired location. The passive reflectors can be placed in a folded or otherwise compact mode, for transport into underground tunnels. Once at the desired installation location, the system can be installed, with the reflectors positioned appropriately for the radio frequencies used at the location. Some of the embodiments include any of vertical or horizontal foldable reflector poles, reflective sheets, reflective mesh sheets and/or ropes, inflatable reflective pucks, and rapid deployment systems and methods.

Systems and methods are provided for provisioning of telecommunications signals in moving trains. Scattering panels may be utilized for redirecting wireless signals, such as by scattering them, to provide better communication performance on the moving trains. The scattering panels may be configured to scatter the signals, such as by reflecting them. The scattering panels may be configured for operation in conjunction with a number of antennas that communicate the signals being scattered via the scattering panels.

A device for receiving and re-radiating electromagnetic signals. The device includes at least a waveguide with a first set of slot radiators for receiving electromagnetic signals, and a second set of slot radiators for transmitting electromagnetic signals generated on the basis of the received electromagnetic signals in the waveguide. The first set of slot radiators includes one or more slot radiators, and the second set of slot radiators includes one or more slot radiators. The device also relates to a method for receiving and re-radiating electromagnetic signals by a device including at least a waveguide, and the use of the device as a repeater of electromagnetic signals, for transferring electromagnetic signals through a structure, and/or as a building product.

A device for receiving and re-radiating electromagnetic signals. The device includes at least a waveguide with a first set of slot radiators for receiving electromagnetic signals, and a second set of slot radiators for transmitting electromagnetic signals generated on the basis of the received electromagnetic signals in the waveguide. The first set of slot radiators includes one or more slot radiators, and the second set of slot radiators includes one or more slot radiators. The device also relates to a method for receiving and re-radiating electromagnetic signals by a device including at least a waveguide, and the use of the device as a repeater of electromagnetic signals, for transferring electromagnetic signals through a structure, and/or as a building product.

A system for reflecting an RF signal comprises a plurality of antenna units configured to receive the RF signal and passively reflect the RF signal. The antenna units are reconfigurable to achieve beamforming in reception and reflection, respectively, of the RF signal. The system may be a Large Intelligent Surface (LIS). A control system is configured to: detect (301) a wake-up signal WUS1, and after detecting WUS1, perform a first training operation (I) comprising: receiving (302), by the antenna units, a first reference signal RS1 from a first device D1 and reconfiguring (303) the antenna units based on RS1 to achieve beamforming in reception in a direction of D1. By the combination of WUS1 and the first training operation, the system may be automatically configured to achieve beamforming in relation to D1 which is thereby enabled to communicate via the system.

A system for reflecting an RF signal comprises a plurality of antenna units configured to receive the RF signal and passively reflect the RF signal. The antenna units are reconfigurable to achieve beamforming in reception and reflection, respectively, of the RF signal. The system may be a Large Intelligent Surface (LIS). A control system is configured to: detect (301) a wake-up signal WUS1, and after detecting WUS1, perform a first training operation (I) comprising: receiving (302), by the antenna units, a first reference signal RS1 from a first device D1 and reconfiguring (303) the antenna units based on RS1 to achieve beamforming in reception in a direction of D1. By the combination of WUS1 and the first training operation, the system may be automatically configured to achieve beamforming in relation to D1 which is thereby enabled to communicate via the system.

A power and data housing assembly includes a housing body configured to retain and support an electrical device assembly in the form of a radio frequency (RF) transmitter. The RF transmitter is configured to emit a transmitted RF signal that contains one of data transmissions and power transmissions, and acts as a repeater and/or range-extender or signal redirector for directing wireless power and/or data signals into regions of work areas that otherwise would receive only marginal signals, or none at all.

A power and data housing assembly includes a housing body configured to retain and support an electrical device assembly in the form of a radio frequency (RF) transmitter. The RF transmitter is configured to emit a transmitted RF signal that contains one of data transmissions and power transmissions, and acts as a repeater and/or range-extender or signal redirector for directing wireless power and/or data signals into regions of work areas that otherwise would receive only marginal signals, or none at all.

A method for optimizing user equipment wireless localization using K reconfigurable intelligent surfaces reflecting signal(s) transmitted between a base station and the user equipment, the method including, whatever an a priori position of the user equipment selecting at least one reconfigurable intelligent surface to activate among the K reconfigurable intelligent surfaces, determining phases of elements of the at least one reconfigurable intelligent surface, by minimizing a predetermined cost function, depending on the a priori position, and accounting for a predetermined position error bound of the user equipment, while ensuring that at most K reconfigurable intelligent surfaces are selected, ensuring that the minimum Euclidian distance between two consecutive selected reconfigurable intelligent surfaces of a predetermined configuration, is strictly higher than a predetermined value limiting interference between additional multipath components generated by the at least one reconfigurable intelligent surface.

A method for optimizing user equipment wireless localization using K reconfigurable intelligent surfaces reflecting signal(s) transmitted between a base station and the user equipment, the method including, whatever an a priori position of the user equipment selecting at least one reconfigurable intelligent surface to activate among the K reconfigurable intelligent surfaces, determining phases of elements of the at least one reconfigurable intelligent surface, by minimizing a predetermined cost function, depending on the a priori position, and accounting for a predetermined position error bound of the user equipment, while ensuring that at most K reconfigurable intelligent surfaces are selected, ensuring that the minimum Euclidian distance between two consecutive selected reconfigurable intelligent surfaces of a predetermined configuration, is strictly higher than a predetermined value limiting interference between additional multipath components generated by the at least one reconfigurable intelligent surface.