Two-way (full-duplex) wireless communications. Various embodiments measure interference channels and provide for interference cancellation in both analog and digital domains to mitigate self-interference. The system supports multiple clients wherein new clients can join the network asynchronously, and also supports Multiple-Input Multiple-Output (MIMO) antennas.

Full duplex wireless transmission with self-interference cancellation

A full-duplex transceiver is provided with componentry and methods for cancellation of nonlinear self-interference signals. The transceiver is capable of receiving an incoming radio-frequency signal that includes both a desired radio-frequency signal component and a self-interference component caused by the transceiver's own radio-frequency transmission. The transceiver demodulates the incoming radio-frequency signal to generate a first demodulated signal. The transceiver combines an analog corrective signal with the first demodulated signal to generate a second demodulated signal with reduced self-interference. The transceiver processes the first and second demodulated signals to determine a desired incoming baseband signal and to determine nonlinear components of the self-interference signal, such as nonlinearities introduced by the transceiver's power amplifier.

Wireless Full-Duplex System and Method Using Sideband Test Signals

An adapter for enabling full-duplex wireless communications is described, along with methods for operating the adapter. The adapter operates as an intermediary between a transmit antenna and receive antenna on the one hand, and a transceiver on the other hand. The adapter communicates with the transceiver using different frequencies for outbound and inbound radio-frequency signals. However, with respect to the transmit antenna and receive antenna, the adapter transmits outbound and receives inbound radio frequency signals using the same frequency. The adapter includes cancellation circuitry to reduce the self-interference cause by transmitting and receiving on the same frequency.

Adapter and associated method for full-duplex wireless communication

A method and apparatus for making a mesh reflector that may be used to produce a shaped reflector is provided. The mesh reflector may be an umbrella-style deployable mesh reflector capable of approximating both parabolic and arbitrarily shaped reflecting surfaces, including those with regions of reversed curvature. The reflecting surface may be provided by a soft mesh attached to a highly pre-tensioned net composed of two sets of substantially parallel chords forming a plurality of parallelogram-shaped facets. The net/mesh may be made to conform to the desired shape by pulling and/or pushing on it at each of its facet corners via a set of finely adjustable tension ties and/or compression rods, the distal ends of which react against a set of pre-tensioned catenary-shaped chords disposed on the aft side of the mesh. The net/mesh and the aft catenaries may be supported and pretensioned by a set of substantially stiff radial ribs connected to a central hub by a means capable of providing high deployment torque and a means for controlling and coordinating the deployment of the ribs so that they reach their fully deployed positions nearly simultaneously. Methods for fabricating the mesh and attaching it to the net are also provided.

Arbitrarily shaped deployable mesh reflectors

Two-way (full-duplex) wireless links in facilitating network management and improve network performance. Once aspect includes methods for network management using an overlaid network for control signaling. Another aspects include methods to facilitate practical realization and improve performance of some of the network information theoretic configurations, such as Space-Division Multiple Access (SDMA) in uplink and downlink, Interference Channel, and other forms of distributed collaborative signaling schemes. Another aspect includes methods to support cognitive wireless networks.

Distributed collaborative signaling in full duplex wireless transceivers

A reflector for reflecting electromagnetic waves has a configured surface for these waves whereby localized deformations or configurations such as bumps (B) and dents (D) of the reflector ( 1 ) are so constructed that the reflector cooperates with several focuses ( 10 A, 10 B; 110 A, 110 B) which are spatially separated from the reflector proper. These focuses are so arranged that the electromagnetic beams emanating from the respective radiators ( 4 A, 4 B; 40 A, 40 B) and are directed onto the reflector can be directed through the reflector onto a common region ( 3 A, 3 B) to be illuminated, whereby particularly the beams may be tuned to different frequencies or for operation in different frequency bands. Such reflectors are particularly useful in antenna systems for communications such as satellite communications.

Antenna reflector having a configured surface with separated focuses for covering identical surface areas and method for ascertaining the configured surface

The invention relates to a reflector with shaped surface for electromagnetic waves, whereby a local shaping of the reflector (1) is designed such that the reflector (1) has a plurality of spatially separate foci (10a, 10b, 110a, 110b) has. It can thus spatially separated radiators (4a, 4b, 40a, 40b) emanating electromagnetic beam (5a, 5b, 50a, 50b), in particular those of different frequencies or frequency bands to illuminate the reflector (1), (a common coverage area 3 are directed 3a, 3b).

Reflector with shaped surface and spatial separated foci for the illumination of identical areas, antenna system and method for determining the surface

PROBLEM TO BE SOLVED: To attain a high data transmission capacity while sufficing decoupling between radiation for transmission and radiation for reception in the case of using a radiation beam for two-way transmission. SOLUTION: This reflecting mirror for an antenna to reflect an electromagnetic wave is shaped to have foci 10a, 10b apart from each other. Thus, e.g. electromagnetic radiation beams 5a, 5b with different frequencies or frequency bands emitted from radiation elements 4a, 4b placed apart from each other are emitted onto the reflecting mirror 1, which reflects them and directs the reflected beams to one common coverage area 3.

Reflecting mirror for antenna, antenna system using the reflecting mirror, and method for deciding surface shape of the reflecting mirror

Local adapted shapes on a reflector (1) are designed to give the reflector multiple focal points (10a,10b,110a,110b) separated by spaces. As a result, electromagnetic bundles (5a,5b,50a,50b) of rays emerging from rays (4a,4b,40a,40b) separated by spaces are directed at a common illuminating area (3a,3b), especially for bundles with different frequencies/bands that illuminate the reflector. An Independent claim is also included for a method for determining the shaping of a reflector's surface.

Shaped Reflector with spatially separated foci for the illumination of identical areas, and method for determining its surface

Die Erfindung betrifft einen Reflektor mit geformter Oberflache fur elektromagnetische Wellen, wobei eine lokale Formgebung des Reflektors (1) derart ausgelegt wird, das der Reflektor (1) mehrere, raumlich getrennte Foki (10a, 10b, 110a, 110b) aufweist. Es konnen dadurch von raumlich getrennten Strahlern (4a, 4b, 40a, 40b) ausgehende elektromagnetische Strahlbundel (5a, 5b, 50a, 50b), insbesondere solche verschiedener Frequenz oder Frequenzbander, die den Reflektor (1) ausleuchten, auf ein gemeinsames Ausleuchtgebiet (3, 3a, 3b) gerichtet werden.

Reflektor mit geformter Oberfläche und räumlich getrennten Foki zur Ausleuchtung identischer Gebiete, Antennensystem und Verfahren zur Oberflächenermittlung

Robert Sekora

Papers

Antenna reflector having a configured surface with separated focuses for covering identical surface areas and method for ascertaining the configured surface

Reflector with shaped surface and spatial separated foci for the illumination of identical areas, antenna system and method for determining the surface

Reflecting mirror for antenna, antenna system using the reflecting mirror, and method for deciding surface shape of the reflecting mirror

Shaped Reflector with spatially separated foci for the illumination of identical areas, and method for determining its surface

Reflektor mit geformter Oberfläche und räumlich getrennten Foki zur Ausleuchtung identischer Gebiete, Antennensystem und Verfahren zur Oberflächenermittlung