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 system includes a processor and a memory. The memory stores instructions executable by the processor to identify an equalization response for equalizing an output signal of a modulator of a satellite gateway, generate a compensation response based on the equalization response and a sample rate of a pre-distorter of the modulator, and send the equalization response to the pre-distorter.

Technologies directed to calibrating phased array antennas are described. A processing device of a communication device causes a first radio to send a first signal via a first antenna element. The first signal has a set of tones. Each tone of the set of tones has a frequency within a fixed frequency range. The processing device causes a second radio to receive a second signal via a second antenna element. The second signal is a response to the first signal. The processing device determines that there is a difference between the second signal and a reference signal. The processing device adjusts at least one of a phase parameter value, a gain parameter value, or a time-delay parameter value of a radio frequency component based on the difference.

The present specification generally relates to the field of satellite communication and particularly discloses a method and arrangement for providing broadband from a hybrid satellite-terrestrial solution. The system is adapted to have a improved latency in a less complex construction that provides overall cost benefits and comprises a user terminal, a satellite and a satellite gateway.

In an exemplary embodiment, a phased array antenna comprises multiple subcircuits in communication with multiple radiating elements. The radio frequency signals are independently adjusted for both polarization control and beam steering. In a receive embodiment, multiple RF signals of various polarizations are received and combined into at least one receive beam output. In a transmit embodiment, at least one transmit beam input is divided and transmitted through multiple radiating elements, with the transmitted beams having various polarizations. In an exemplary embodiment, the phased array antenna provides multi-beam formation over multiple operating frequency bands. The wideband nature of the active components allows for operation over multiple frequency bands simultaneously.

Software-based orchestration of communication payloads in satellites. In an embodiment, a payload model of a satellite payload, defined in a data modeling language (e.g., YANG) and representing a configuration for the satellite payload, is received. The configuration specifies a setting for at least one component of the satellite payload. The payload model is translated into one or more satellite commands for configuring the satellite payload according to the configuration represented in the payload model, and the satellite payload is reconfigured using the satellite command(s).

For determining a communication window is disclosed, a method generates a communication graph that includes backbone nodes, dummy nodes, data collection nodes, downlink nodes, crosslink send nodes, and crosslink receive nodes. The backbone nodes, the data collection nodes, the downlink nodes, the crosslink-transmit nodes, and the crosslink-receive nodes are connected by one of a homogenous edge between nodes of a same type and transition edges between nodes of a different type. The method determines access windows for downlink communications and crosslink communications using the communication graph. The method selects access windows based on a task graph generated from the communication graph. The method communicates from a given satellite within the selected access windows.

Embodiments of systems and methods for combining downlink signals representative of a communication signal are provided herein. An example method comprises receiving the downlink signals from antenna feeds. In a first processing block(s) in a processor(s), performing a first blind detection operation on first packets of a first signal, and performing a first doppler compensation operation on the first packets. In a second processing block(s) in the processor(s) in parallel with the first processing block(s), performing a second blind detection operation on second packets of a second signal, and performing a second doppler compensation operation on the second packets. The method also comprises combining the first signal and the second signal based on (i) aligning the first data packets with the second data packets and (ii) performing a weighted combiner operation that applies scaling to the first and second packets based on corresponding signal quality.

A satellite communication system leverages the carrier offset detection capability of the demodulator contained in an on-board modem of M&C channel. The modem detects the frequency error Δf introduced in the signal path from the output of the base station at ground to the output of baseband conversion on the satellite, by analyzing the baseband signal at the baseband conversion to estimate the received carrier f′c and subtracting it the from the expected frequency (fc).

A global communication system includes a mobile portion; a phased-array antenna attached to the mobile portion; an actuator to move the antenna in one direction to face a satellite; a transceiver to communicate with the satellite; and a processor controlling the actuator to optimize communication from the transceiver.