Abstract: Systems and methods for a satellite communication system include identifying highly active terminals (HUTs) in a spot beam of a satellite; determining a first ratio of single-band HUTs that operate in a first frequency band only to multi-band HUTs that operate in the first frequency band and a second frequency band; and determining a second ratio of outroutes for the first frequency band to outroutes for the second frequency band. When the first ratio is less than the second ratio, a first step of balancing the single-band HUTs across the outroutes for the first frequency band is performed, and then the multi-band HUTs are balanced across both the outroutes for the first frequency band and the outroutes for the second frequency band. When the first ratio is greater than the second ratio, the single-band HUTs and the multi-band HUTs are allocated based on at least one weight factor.

Abstract: Systems and methods for operating a satellite terminal for a multi-band hybrid satellite communication system include receiving a configuration file for a satellite terminal for the satellite communication system; determining frequency band(s) supported by the satellite terminal from the configuration file; automatically selecting a best available outroute that is compatible with the frequency band(s) supported by the satellite terminal even if the best available outroute is not an anchor route listed in the configuration file; and performing a commissioning process to connect the satellite terminal to a satellite associated with the best available outroute.

Abstract: Techniques are described for implementing multiband digital predistortion in a broadband transmitter in a manner that provides effective compensation of non-linear distortion arising from integration of a high-power amplifier (HPA). Embodiments segment the signal spectrum of a transmit signal into multiple sub-band signals and apply non-linear distortion compensation separately and concurrently for each sub-band signal. The resulting multi-band digital predistortion (mDPD) compensates both for in-band distortion and for distortions from non-linear interactions between the frequency sub-bands. The disclosed mDPD can provide enhanced performance features, such as handling of memory effects, reduced sampling rate requirements for DPD components, and minimizing detrimental spectral regrowth at the HPA output.

Abstract: In some implementations, methods, systems, and apparatus, including machine-readable media storing executable instructions, are provided for switching radio frequency chains. For example, a gateway for a satellite communication system can include a first radiofrequency chain, a second radiofrequency chain, and a third radiofrequency chain configured to operate in a standby mode. The gateway includes radiofrequency switches configured to (i) switch between coupling the first radiofrequency chain and the third radiofrequency chain to a first antenna feed for the first channel, and (ii) switch between coupling the second radiofrequency chain and the third radiofrequency chain to a second antenna feed for the second channel. The gateway also includes a controller configured to monitor the status of the radiofrequency chains and, based on the monitored status, instruct the radiofrequency switches to switch between different connections of the radiofrequency chains with the antenna feeds.

Abstract: A method and system for simplifying interactions of a Software Defined Network (SDN) controller including: receiving a network program to traverse a mobile node network including mobile nodes and ground nodes, wherein the ground nodes include an ingress node and an egress node; forecasting links, based on a temporal line-of-sight topology, of the mobile node network between the mobile nodes and the ground nodes; determining network program subfunctions that reflect an availability of the links for a time period; selecting, for the time period, a viable path including one or more of the network program subfunctions to traverse from the ingress node to the egress node; and communicating network traffic from the ingress node to the egress node using the viable path during the time period, wherein a portion of the viable path traverses one or more of the mobile nodes and the mobile nodes move along deterministic paths.

Abstract: A system and method for reducing usage of satellite channelizers including dividing a frequency spectrum into sub-bands; providing a satellite channelizer for each of the sub-bands, where each of the sub-bands may include channels; multiplexing service channels into the channels of one of the sub-bands, where the service channels convey data for a plurality of MSSs. A system and method for obtaining high throughput on a satellite network. A system and method for providing a Fair Access Policy (FAP) in a 4G system.

Abstract: Various arrangements for improving performance of code split communications are presented herein. A second portion of a first codeword and a third portion of a second codeword can be transmitted using symbols such that each transmitted symbol includes bits from the second portion of the first codeword and bits from the third portion of the second codeword. At a receiver, decoder inputs can be generated for the third portion of the second codeword based on an optimized constellation and the second portion of the first codeword. The second portion of the first codeword is used to identify a label group of the optimized constellation and eliminate all other label groups of the plurality of label groups. Within each label group, symbol labels are Gray labeled. However, at least a first symbol label is not Gray labeled with an adjacent second symbol label of a different label group.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for wireless communication with modulation using electromagnetic polarization. In some implementations, a device receives input data to transmit over a wireless communication channel, and the device has a (i) first antenna feed to receive signals for transmission with a first polarization and (ii) a second antenna feed to receive signals for transmission with a second polarization. The device modulates a radiofrequency carrier to generate modulated output that encodes a first subset of the input data, then upconverts the modulated output of the modulator to generate upconverted output. The device varies a polarization with which the upconverted output is transmitted based on a second subset of the input data, such that the input data is transmitted using both (i) modulation of the radiofrequency carrier signal and (ii) variation of the polarization with which the modulated signal is transmitted.

Abstract: A method for frequency and time synchronization with respect to a satellite, the method including: calculating a frequency offset ({circumflex over (f)}B,e) due to an instability of a satellite oscillator from a beacon signal (fB,TXN); determining a Satellite Motion Doppler Correction for Ephemeris (SMDCe) of a satellite motion based on ephemeris data for the satellite; computing a Satellite Reference Drift Correction for Ephemeris (SRDCe) based on the frequency offset, the beacon signal and the SMDCe; setting a loopback TX frequency based on the SMDCe and the SRDCe; and transmitting a loopback TX signal to the satellite at the loopback TX frequency.

Abstract: A system for inroute throttling in a satellite network is disclosed. The system includes an IP Gateway (IPGW) that may compute a volume usage count of inroute traffic associated with a terminal, compare the computed volume usage count of inroute traffic with a first threshold, and transmit, based on the comparison, a Fair Access Policy (FAP) state to the terminal. The FAP state corresponds to one of a throttled and an unthrottled. The system further includes an Inroute Group Manager (IGM) that may receive, from the terminal, the FAP state and apply a FAP, on the inroute traffic from the terminal, corresponding to the received FAP state.

Abstract: A system and method for granting demand access to a data network from an Out of band (OOB) network, the method including: locking to an OOB inroute illuminating an OOB coverage area of the OOB network; transmitting an OOB request including a Demand Assigned Multiple Access (DAMA) request for the data network to an OOB Network Management System (NMS) via the OOB inroute; sending, from the OOB NMS, the DAMA request to a data NMS of the data network; and fulfilling the DAMA request.

Abstract: A method, device, and non-transitory computer-readable medium are provided. Responsive to the device determining that a first user is not registered in a node registry upon startup, a public key of the first user and private key of the first user are generated, and the public key is registered in the node registry. Responsive to receiving a lookup request from a securely connected computing device, a public key lookup request for a public key of a second user is sent to the node registry by the device. The device receives the public key of the second user responsive to the sending of the public key lookup request. Responsive to receiving a message for the second user and an encryption request from the computing device, the device encrypts the message using the public key of the second user to produce an encrypted message that is transmitted to the computing device.

Abstract: Dynamic in-route reconfiguration in a satellite network includes receiving at least one of transmit power capability and demand requirements from one or more active satellite terminals of the satellite network, determining a resulting in-route configuration during operation of the satellite network based on the received at least one of transmit power capability and demand requirements, comparing the determined resulting in-route configuration to a current in-route configuration. When the determined resulting in-route configuration is different from the current in-route configuration, establishing the determined resulting in-route configuration as the current in-route configuration and storing the established current in-route configuration in a dynamic in-route reconfiguration manager, and transmitting the established current in-route configuration to the one or more active satellite terminals.

Abstract: An apparatus and method for predicting the impact of various weather conditions on signal quality in a satellite communication system. A first model is generated for predicting RF signal degradation, and trained with link quality metrics from selected terminals over a first time interval. A second model is generated for predicting RF signal degradation resulting from weather conditions, and trained with both the link quality metrics from the selected terminals and weather conditions over a second predetermined time interval. Real time link quality metrics are analyzed using the trained first model and the trained second model in order to identify changes in current RF signal quality. At least one recommendation is subsequently generated to indicate a cause for changes in the current RF signal quality.

Abstract: A network communication system which provides cost effective support for two or more WAN transports from a single SD-WAN site. The network communication system, may at times by default, monitor a higher-cost WAN for only basic connectivity to reduce monitoring costs of the transport. Where an application is properly configured, the system may override the default to monitor a higher-cost WAN for acceptable performance (i.e., monitored for connectivity, packet loss, latency, jitter & capacity) even when that WAN is not selected as active transport.

Abstract: Systems and methods for providing application-layer characterization is disclosed. Quick User Datagram Protocol (UDP) Internet Connection (QUIC) is an end-to-end encrypted, transport-layer protocol, with a goal to improve communication security and quality of experience (QoE) towards end-users. The systems and methods disclosed herein relate to estimating application-level traffic attributes without decrypting QUIC packets. Based on size, timing, and direction information available in the encrypted packet, the system analyzes associated network traffic to infer an identity of each request and response pair, including time, size, and request-response match, as well as multiplexing feature in each QUIC connection. In the case of request and response multiplexing, several requests will be gathered and matched as a group with their corresponding responses, to form a super request-response pair.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for determining a terminal idle time. In some implementations, a server can obtain communication data from a plurality of devices in a communication network, wherein the communication data indicates levels of network traffic for the device over time. The server can generate an idle period forecasting model configured to predict occurrence of future communication idle periods in which communication activity is predicted to be below a threshold. The server can provide the idle period forecasting model to each of the plurality of devices such that the devices can respectively use the idle period forecasting model to locally predict future communication idle periods of the devices.

Abstract: Devices, systems, methods, and non-transitory media facilitate image rejection for a radio frequency signal with a wideband carrier. Wideband signals from a device may be analyzed, the wideband signals corresponding to a wideband channel. Each wideband signal may correspond to a sinusoidal electrical signal with IQ amplitude and phase modulation. An in-phase component (I) of a wideband signal may be determined. A quadrature component (Q) of the wideband signal may be determined. Based on the determined I and Q, a wideband IQ imbalance may be determined. A scalar error based on the wideband IQ imbalance may be obtained. The scalar error may be mapped to a vector error plane. Orthogonal error vector points that are based on the mapping may be determined. The wideband IQ imbalance of the device may be compensated based on adjusting an IQ setting of the device with the orthogonal error vector points.

Abstract: Devices, systems and method for enabling radio communications between a plurality of users are disclosed herein. In an embodiment, a mobile tactical device includes a radio connection interface, a first frequency converter, a frequency filter, and a second frequency converter. The radio connection interface is configured to receive a first radio communication having a mobile frequency from a mobile radio. The first frequency converter is configured to convert the mobile frequency to an intermediate frequency. The frequency filter is configured to pass or reject the intermediate frequency. The second frequency converter is configured to convert the intermediate frequency to an assigned transmission frequency for transmission of the first communication when the intermediate frequency passes the at least one frequency filter.

Abstract: An AESA (Active Electronically Scanned Array), including: a PCB (Printed Circuit Board) substrate having an obverse surface; TRMs (Transmit/Receive Modules) disposed on the obverse surface; thermal pedestals wherein each thermal pedestal includes a wall, having a wall height, including wall surfaces and one of the wall surfaces being a contact surface; and a TIM (Thermal Interface Material), having a TIM height, disposed between a respective contact surface of the thermal pedestals and the obverse surface. The thermal pedestals are discrete with respect to one another, the contact surfaces of the thermal pedestals are interspersed about the TRMs, the thermal pedestals do not contact the TRMs, the TIM is electrically and thermally conductive, and the wall height plus the TIM height is sufficient to suppress resonances of the TRMs below a frequency greater than the Tx and Rx frequency bands of the TRMs.