A relay station includes a beam formation unit capable of emitting multiple beams to multiple respective emission areas. The beam formation unit forms clusters each from two or more of the emission areas, and emits the beams based on assignment information indicating which slot is assigned to which of the emission areas on a per cluster basis. One emission area belongs to multiple clusters.

Methods and systems are described for providing end-to-end beamforming. For example, end-to-end beamforming systems include end-to-end relays and ground networks to provide communications to user terminals located in user beam coverage areas. The ground segment can include geographically distributed access nodes and a central processing system. Return uplink signals, transmitted from the user terminals, have multipath induced by a plurality of receive/transmit signal paths in the end to end relay and are relayed to the ground network. The ground network, using beamformers, recovers user data streams transmitted by the user terminals from return downlink signals. The ground network, using beamformers generates forward uplink signals from appropriately weighted combinations of user data streams that, after relay by the end-end-end relay, produce forward downlink signals that combine to form user beams.

A device includes a primary sector and secondary sectors communicatively coupled to the primary sector. The processor included in the primary sector is configured to down convert a Radio Frequency (RF) signals with a first frequency to an analog baseband (IQ) signal with a second frequency, and receive a second digital baseband signal that comprises a first digital baseband signal and a digital echo signal. The first digital baseband signal comprises a training sequence signal. Further, the processor estimates a plurality of filter taps of the FIR filter based on the digital echo signal and estimate the digital echo signal in the received second digital baseband signal based on the first digital baseband signal and the plurality of filter taps of the FIR filter. The estimated digital echo signal is removed from at least one current digital baseband signal based on the down conversion of the RF signals.

A device for the reception of ADS-B messages for a satellite is disclosed including an array of sources and a beamforming module, a ground footprint of a field of view defining a service area, different service areas being associated with different positions of the satellite, a ground footprint of a beam defining a spot in the service area, the beamforming module being configured to form each beam by applying combination coefficients, the reception device having a processing circuit configured to obtain information representative of a position of the satellite and to modify a set of combination coefficients so as to adapt the surface area and/or or the shape of the formed spots to a geographical distribution of the aircrafts within the service area associated with the position of the satellite.

Within a satellite communications system, a base station communicates with standard compliant user equipment (UE) via a satellite having a field of view. The base station has a processor that instructs the satellite to generate a wide beam signal covering a plurality of cells in the field of view, and detects an access request from a user equipment within the plurality of cells over the wide beam signal. The base station, comprising a processing device such as an eNodeB, then generates one or more network broadcast/access signals that is uplink to a satellite and broadcasted via one or more nominal beams generated by the satellite, covering all the inactive cells, one of the plurality of cells having the access request.

A receiver determines whether an outbound carrier frequency among a plurality of outbound carrier frequencies, as received, includes interference. Based at least in part on a result of the determining, a new outbound carrier frequency is selected for the receiver. Optionally, the receiver sends an interference report to a system controller.

A method for multibeam coverage of a region of the surface of the Earth includes the generation, by a telecommunications payload embedded on a satellite, of a plurality of radiofrequency beams, called elementary beams; the formation of a plurality of radiofrequency beams, called composite beams, exhibiting footprints on the ground of different sizes, each the composite beam being obtained by the grouping of one or more elementary beams; and the transmission or the reception of data through the composite beams, identical data being transmitted or received through all the elementary beams forming one and the same composite beam.

A downlink interference is dynamically suppressed in a multi-feeder link of a same frequency between an aerial-floating type communication relay apparatus and plural gateway (GW) stations with a simple configuration. A plurality of pilot signals, which are spectrally spread using a plurality of spread codes orthogonal to each other, are transmitted and received between the relay communication station of the aerial-staying type communication relay apparatus and plural GW stations, a propagation path response between plural GW stations and an antenna for feeder link of the communication relay apparatus in a transmission signal band of the feeder link is estimated based on reception results in which the plural pilot signals are spectrally inverse-spread, plural weights respectively corresponding to the plural of GW stations are calculated based on the plural propagation path responses, and with respect to each of the plural GW stations, a signal to be transmitted and received via a directional beam corresponding to another GW station is multiplied by the weight corresponding to the other GW station and subtracted from a signal to be transmitted and received via the directional beam corresponding to the GW station.

A method and system for mitigating inter-satellite interference are provided. The method includes modifying a beam bore-sight of a satellite according to a hexagonal mapping, identifying beams of the satellite positioned outside of the hexagonal mapping, and reducing power of the beams positioned outside of the hexagonal mapping.

A method for multibeam coverage of a region of the surface of the Earth includes the generation, by a telecommunications payload embedded on a satellite, of a plurality of radiofrequency beams, called elementary beams; the formation of a plurality of radiofrequency beams, called composite beams, exhibiting footprints on the ground of different sizes, each the composite beam being obtained by the grouping of one or more elementary beams; and the transmission or the reception of data through the composite beams, identical data being transmitted or received through all the elementary beams forming one and the same composite beam.