Abstract: A system and method for managing a terminal uplink power, and a terminal having uplink power managed by a gateway are provided. The method including: dividing, at a gateway, a beam coverage area into sub-beams and each of the sub-beams into one or more frequency bins; associating a sub-beam of the sub-beams with terminals located within the sub-beam; determining Transmit Power (TP) values including a transmit power or attenuation for each of the one or more frequency bins of the sub-beam; sending, from the gateway, the TP values of the sub-beam to the terminals via a forward link; and receiving, at the gateway, a burst transmitted using a terminal transmit power calculated from the TP values of the sub-beam. The TP values may change in response to an SNR measurement at the gateway and/or feedback from the terminal.

Abstract: Systems and methods are described, and one method includes receiving at a first network a request for a second network configuration data and an identifier of a first network home service plan of the mobile terminal, and transmitting to the second network an inter-network configuration data request. The inter-network configuration data request carries the request for the second network configuration data and an identifier of the mobile terminal's first network home service plan. The first network receives from the second network an inter-network configuration data response that carries the second network configuration data and, in response, transmits the second network configuration data to the mobile terminal.

Abstract: A User Equipment and method for transmitting a random-access radio frequency (RF) signal by applying Asynchronous Coded Multiple Access (ACMA) in a communication system employing Orthogonal Frequency Division Multiplexing (OFDM) is described. The method including: encoding an information stream as OFDM symbols using a low rate Forward Error Correction (FEC) coding suitable for Successive Interference Cancellation (SIC) to form a payload; generating a burst, including symbols, by performing an inverse fast Fourier transform on a unique word (UW) multiplexed with the payload; and synchronizing a transmission of each of the symbols of the burst with consecutive symbol-start instants. The UW includes a plurality of Zadoff-Chu (ZC) like sequences disposed in a subset of consecutive symbol-start instants of the burst. A receiver detects burst arrival by searching for consecutive ZC-like sequences. Channel state estimation can be performed by using the UW with additional ZC-like sequences in the burst.

Abstract: A method for providing a multipath satellite backbone is disclosed. The method includes: creating sub-backbone flows over multipaths between a first peer and a second peer, wherein each of the sub-backbone flows is associated with one of the multipaths; retrieving a policy corresponding to each of the multipaths, the first peer and the second peer; receiving a transport metric for at least one of the multipaths; calculating distribution weights for the sub-backbone flows based on the policy and the transport metric; and transporting traffic over the sub-backbone flows based on the distribution weights, wherein at least one of the multipaths is relayed by a satellite.

Abstract: A deinterleaver device, a method for deinterleaving, an interleaver device, and a method for interleaving are disclosed. The method for deinterleaving includes: providing a memory and a stream count for a frame; virtually dividing the memory into equal sections, wherein a section count equals the stream count; calculating a write address for a sample of the samples based on a location of the sample in the frame and a correspondence of the location to one of the sections; receiving the sample; and writing the received sample to the write address, wherein the calculating and the write address corresponds to a correct deinterleaving location in one of the sections for the sample.

Abstract: A method for balancing inroute traffic load that contains both guaranteed QoS and best effort traffic. Hierarchical grouping levels are defined with the lowest level corresponding to inroutes within the system. Certain levels have common symbol rates, modulation rates, or both. When a new terminal requires admission, it is assigned to entries in the different hierarchical levels so that the inroute traffic load across all levels are balanced. Terminals are admitted to inroutes based, in part, on their channel quality indicator. Inroute traffic load can periodically rebalance based on elapsed time or terminal redistribution.

Abstract: A system and method for timing synchronization of satellite switching instants with gateway switching instants is described.

Abstract: A Radio Frequency Impairments (RFI) compensator and a process to remove RFI is disclosed. The RFI compensator including: a conjugator to conjugate a signal {tilde over (x)}[n] to provide a signal {tilde over (x)}*[n]; and a filter to apply coefficients that equalize a linear distortion of the signal {tilde over (x)}[n] and reject an interfering image of the signal {tilde over (x)}*[n]. The signal {tilde over (x)}[n] may be a single wideband carrier or may include multiple carriers at different carrier frequencies.

Abstract: A terminal device in a first network includes a processor programmed to receive first data indicating a respective first loading of each of a plurality of first level access devices. The processor is further programmed to select a first level access device based at least in part on the first data; and communicate with a second network via the selected first level access device and a selected second level access device. Each of the first level access devices is switchable to communicate with the first terminal via at least a respective one of one or more shared access channels, and each of a plurality second level access devices is switchable to communicatively couple one or more of the plurality of first level access devices with a second network.

Abstract: A base station computer that includes a processor and memory storing instructions executable by the processor is described. The processor may be programmed to: determine a geographic position of a user terminal (UT); store the position in the memory; determine to page the UT; correlate a satellite beam based on the position; and page the UT via the satellite beam.

Abstract: Interference cancellation in a receiver can be used to improve bandwidth efficiency. The transmission of bursts from different terminals scheduled at separate time intervals can overlap partially such that time used for information transmission is optimized. For example, a receiver includes a signal processor including instructions executable to select first data including a first burst and a successive second burst from a transmission. The signal processor demodulates and decodes information from the first burst. The signal processor further generates a remodulated first burst based on recoded and remodulated information and generates second data by subtracting the remodulated first burst from the first data. The signal processor synchronizes with a stored symbol pattern in the second burst; and demodulates and decodes the information from the second burst. With such arrangement, the performance of each link is not affected by the partially overlapping burst.

Abstract: A system is disclosed for providing low data rate broadcast services. Different types of broadcast packets are detected among data packets received an external network. The different types broadcast packets contain different a different broadcast content. When a particular type of broadcast packet is detected, a transmit data rate is selected and Walsh codes are assigned for achieving the transmit data rate. Data packets corresponding to the broadcast packets are compressed, and at least one RLC block containing the compressed data packets is created. The RLC blocks are transmitted from a satellite using the assigned Walsh codes.

Abstract: Systems and methods are disclosed and include a method that includes adding a training symbol prefix to an OFDM symbol frame, the prefix including a plurality of training symbols, each including N sub-symbol fields. N/2 of the sub-symbol fields are zero valued, and N/2 of the sub-symbol fields carry corresponding symbols of a N/2 sub-symbol pseudo random training symbol. A first half of the pseudo random training symbol is symmetrical to a second half of the pseudo random training symbol. An OFDM N-sub-carrier transmission carries the prefix as signal power on a first N/2 of its N sub-carriers and suppresses signal power on a second N/2 of the sub-carriers. The first N/2 and second N/2 sub-carriers alternate in the frequency domain.

Abstract: A system and a method for directing a handover of communications in Radio Frequency (RF) networks at a UT. The method includes servicing a user terminal (UT) via a first network having a first coverage area; receiving, from the UT via the first network, a measurement report for a second network having a second coverage area based on a measurement configuration of the second network; sending, to the UT via the first network, a handover order for obtaining service from the second network; and establishing, via a second network RAN (radio access network), a service for the UT via the second network per the handover order. In the method, the first network may include either a terrestrial network (TN) or a non-terrestrial network (NTN), the second network may include other of the TN or the NTN, and the TN and the NTN are RF networks.

Abstract: Techniques for data transmission include a geostationary earth orbiting satellite that includes a first optical communication system configured to receive forward-direction user data via a forward optical link between the satellite and a stratospheric high-altitude communication device, and a first radio frequency (RF) communication system configured to transmit, via a plurality of RF spot beams, the forward-direction user data. The stratospheric high-altitude communication device includes a second RF communication system configured to receive the forward-direction user data via a plurality of concurrent forward RF feeder links, and a second optical communication system configured to transmit to the satellite, via the forward optical link, the forward-direction user data received via the plurality of forward RF feeder links.

Abstract: A system to provide second generation (2G) voice services over internet protocol, the system including: a voice gateway (VGW) including a 2G stack to communicate control plane information and user plane information with a 2G user terminal (UT) via a circuit-switched network without modifications to the 2G-UT, an Iu-CS IP stack, and a relay to map the control plane information between the 2G stack and the Iu-CS IP stack, and vice-versa; a mobile switching center (MSC), connected to the VGW via the Iu-CS IP stack, to manage and establish the voice services between the 2G-UT and a public switched telephone network (PSTN) based on the mapped control plane information; and a media gateway (MGW) connected to the VGW via the Iu-CS IP stack, where the MGW communicates the user plane information between the 2G-UT and the PSTN after the MSC 2-G UT vocoder, e.g. AMBE, has established voice services.

Abstract: Application layer throughput (ALT) shaping is provided for a streaming media session is provided. A request for a content segment is received. The receipt time of the request is recorded and the request is forwarded to a content server. A response message is received from the server. The receipt time of the response and a segment size is determined. An ALT for the current segment is determined based on the receipt times of the request and response messages and the segment size. The ALT rate is compared to a target ALT rate required for a desired session PBR. When the ALT rate is higher than the target ALT rate, the content response is held for a time period determined to lower the current ALT rate to the target ALT rate, and then released to the client device. Otherwise, the content response is promptly provided to the client device.

Abstract: A system includes a shield for a low noise amplifier. The shield includes a top and one or more walls extending from the top defining a cavity. The shield further comprises at least one conducting member extending outwardly from the top and within the cavity. The shield may enclose an amplifier circuit and improve its signal-to-noise ratio.

Abstract: A phase shifter having both digital and analog shifting components is disclosed. The digital-analog phase shifter includes an input/output port configured, in part, for receiving an input radio frequency (RF) signal from an external source and outputting a phase shifted RF signal. A digital shifter performs coarse phase shifts of the input RF signal, while an analog shifter variably shift the phase of the input RF signal relative to the coarse phase shift. This produces a phase shifted RF signal having a total phase range that is output is continuously variable from 0° to 360°.

Abstract: A satellite communication system includes a communication terminal, and a ground station. The ground station is configured to communicate with the communication terminal through a satellite communication path between the ground station and the communication terminal via a satellite. The ground station includes a diversity switch, and an electronic controller. The diversity switch is configured to switch the satellite communication path from a first satellite communication path to a second satellite communication path different from the first satellite communication path. The electronic controller is configured to determine whether a predetermined switching condition is satisfied based on signal attenuations of the first and second satellite communication paths. The electronic controller is further configured to control the diversity switch to switch the satellite communication path upon elapsing a first predetermined time period after determining that the predetermined switching condition is satisfied.