Abstract: A radioterminal includes a wireless communications transmitter, a wireless communications receiver and a GPS receiver. A controller is configured to enable the GPS receiver when the wireless communications receiver is receiving wireless communications, and to disable the GPS receiver when the wireless communications transmitter is transmitting wireless communications. Related methods also are described.

Abstract: Methods of compensating for interference in communications in a satellite communications system are provided. At a first radioterminal, a measure of an error in communications received through a first service down-link from a satellite is generated. A communications waveform is identified which causes interference to communications through the first service down-link to the first radioterminal when it is transmitted to a second radioterminal at a frequency that is substantially the same as a frequency of the first service down-link. The measure of the error and a measure of the interfering communications waveform are processed to obtain at least one interference compensation value. The at least one interference compensation value is combined with a waveform that is to be transmitted to the first radioterminal to obtain an interference compensated waveform. The interference compensated waveform is transmitted to the first radioterminal through the first service down-link.

Abstract: A system and method of operation for efficiently reusing and/or sharing at least a portion of the frequency spectrum between a first satellite spot beam and a second satellite spot beam, and/or an underlay terrestrial network associated with a second satellite spot beam. The spectrum is efficiently reused and/or shared between respective spot beams and/or associated underlay terrestrial systems in a manner minimizes interference between the respective satellite and terrestrial systems.

Abstract: The capacity of a terrestrial wireless communications system that uses a terrestrial frequency band for communications with wireless terminals is expanded by utilizing a satellite frequency band for terrestrially receiving terrestrial communications from the wireless terminals. Since the wireless terminals are configured to transmit communications to a space-based component such as a satellite via a satellite frequency band, these transmissions also may be picked up (received) terrestrially. Thus, terrestrial base stations can be equipped with satellite frequency band receivers that can receive communications from the wireless terminals over a satellite frequency band. By using the satellite frequency band receiver in a terrestrial base station, additional capacity and/or quality of service may be provided for a terrestrial and/or satellite communications system.

Abstract: A method of operating a communications system including a satellite may include providing communications feeder links between the satellite and a plurality of satellite gateways, and providing a communications service link between the satellite and at least one radioterminal using a plurality of satellite service link antenna feed elements. During a first time period, signals of first and second service link antenna feed elements of the plurality of service link antenna feed elements may be coupled between a first one of the plurality of satellite gateways and the first and second service link antenna feed elements. During a second time period, a signal of the first service link antenna feed element may be coupled between the first satellite gateway and the first service link antenna feed element, and a signal of the second service link antenna feed element may be coupled between a second one of the plurality of satellite gateways and the second service link antenna feed element.

Abstract: A space-based component (SBC) of a communications system includes a service link subsystem including a plurality of service link antenna elements configured to provide service links with radioterminals and a feeder link subsystem configured to provide respective feeder links to/from respective processing facilities. The SBC further includes a channelizer configured to map different spectral components of a signal received at the SBC via a service link antenna element to different feeder links.

Abstract: Methods of reducing interference in wireless communications in a communications system are provided. A wireless communications signal is received within a frequency band. The wireless communications signal includes a desired component and an undesired interference component. The interference component may be caused by, for example, communications by another component of the communications system using frequencies in the frequency band. The received communications signal is converted to a frequency domain representation. Frequencies of the interference component of the frequency domain signal are identified. At least some of the identified frequencies of the interference component of the frequency domain signal are attenuated to generate an interference attenuated frequency domain signal. The interference attenuated frequency domain signal is converted to an interference attenuated time domain signal.

Abstract: A method of providing communications can be provided by at least one space-based and/or terrestrial component of a first system/operator transmitting/receiving information using spectrum allocated to a second system/operator at an aggregate interference level at a space-based component of the second system/operator that is less than or substantially equal to a predetermined threshold. Related other methods, systems, and radioterminals are also disclosed.

Abstract: A system and method of operation for efficiently reusing and/or sharing at least a portion of the frequency spectrum between a first satellite spot beam and a second satellite spot beam, and/or an underlay terrestrial network associated with a second satellite spot beam. The spectrum is efficiently reused and/or shared between respective spot beams and/or associated underlay terrestrial systems in a manner minimizes interference between the respective satellite and terrestrial systems.

Abstract: Methods of providing a feeder link between a first substantially geo-stationary satellite and a satellite gateway include establishing a communications link between the satellite gateway and a second substantially geo-stationary satellite, establishing an inter-satellite communications link between the first substantially geo-stationary satellite and the second substantially geo-stationary satellite, and communicating between the first substantially geo-stationary satellite and the satellite gateway via the inter-satellite communications link and the communications link.

Abstract: Communications occur between a satellite and respective first and second classes of terminals using substantially different polarizations. The first class of terminals may include fixed and/or vehicle-based terminals, and the second class of terminals may include handheld terminals. The second class of terminals may include terminals configured to preferentially receive and/or transmit linearly polarized signals, for example, terminals with substantially linearly polarized antennas, and the first class of terminals may include terminals configured to preferentially receive and/or transmit circularly polarized signals, for example, terminals with patch and/or helical antennas configured to transmit and/or receive substantially circularly polarized signals.

Abstract: A communications system includes a first wireless communications system configured to provide wireless communications over a first frequency band, and a second wireless communications system configured to provide wireless communications using at least a portion of the first frequency band. The system includes an inter-system communications link between the first wireless communications system and the second wireless communications system. The inters-system communications link is used to coordinate the use of the first frequency band. The system further includes an interference reducer configured to reduce interference between the first wireless communications system and the second wireless communications system. Related methods are also disclosed.

Abstract: A wireless communications system includes a space-based component (SBC) and an ancillary terrestrial component (ATC) configured to communicate with radioterminals using a common satellite service link frequency band and respective first and second different sets of channel separation codes. The first and second sets of channel separation codes may include, for example, respective sets of scrambling codes, respective sets of frequency assignment codes, respective sets of channel assignment codes, respective sets of sub-channel assignment codes and/or respective sets of spreading codes.

Abstract: Methods, radioterminals, and broadcast message generation consoles provide location-based broadcast messaging for users. A method of operating a radioterminal can include receiving at the radioterminal over a wireless air interface a broadcast message that includes region information that defines a geographic region of applicability. A determination is made at the radioterminal whether the radioterminal is located in the region of applicability. A functional mode of the radioterminal is activated in response to the radioterminal being in the region of applicability. The functional mode may include activating a user interface of the radioterminal.

Abstract: Space-based wireless radiotelephone communications are provided in a satellite footprint over a satellite radiotelephone frequency band. The satellite footprint is divided into satellite cells in which satellite radiotelephone frequencies of the satellite radiotelephone frequency band are spatially reused. At least one of the satellite radiotelephone frequencies that is assigned to a given satellite cell in the satellite footprint is terrestrially reused outside the given satellite cell. A radiation pattern of at least the given satellite cell is modified to reduce interference with the at least one of the satellite radiotelephone frequencies that is terrestrially reused outside the given satellite cell.

Abstract: Methods are provided for predicting uplink interference potential to a mobile satellite system (MSS) generated by ancillary terrestrial components (ATCs) of an ancillary terrestrial network (ATN) and/or ATC radioterminals that are configured to terrestrially use/reuse satellite frequencies that are used and/or authorized for use by a MSS. The methods include measuring power transmitted by and/or received at one or more radioterminals communicating with one or more terrestrial networks and/or transmitted by and/or received at the one or more terrestrial networks communicating with the one or more radioterminals using terrestrial frequencies that are at least partially outside a range of the satellite frequencies. Uplink interference potential to the MSS generated by terrestrial use/reuse of satellite frequencies by the ATN and/or the ATC radioterminals is predicted responsive to the measured power. Related ancillary terrestrial networks are also described.

Abstract: A satellite radiotelephone system includes a space-based component that is configured to communicate with multiple radiotelephones over multiple frequency bands and/or multiple air interfaces. An ancillary terrestrial network is configured to communicate terrestrially with the multiple radiotelephones over substantially the multiple frequency bands and/or substantially the multiple air interfaces. An aggregate radiated power controller is configured to limit an aggregate radiated power by the multiple radiotelephones to a maximum aggregate radiated power.

Abstract: A shared satellite gateway can be configured to process at least first and second communications signals associated with respective at least first and second space-based components. The at least first and second communications signals are provided to/from the shared satellite gateway by respective at least first and second service links and respective at least first and second feeder links of the respective at least first and second space-based components.

Abstract: Satellite radioterminal communications systems, methods and components thereof, can use multiple frequency segments of at least one satellite frequency band, multiple air interfaces, multiple spectrum reuse cluster sizes and/or multiple geographic cell sizes. For example, a space-based component is configured to communicate with first radioterminals in first satellite cells over a first frequency segment of a satellite frequency band, such as a first frequency segment of a satellite L-band, and to communicate with second radioterminals in second satellite cells over a second frequency segment of the same or different satellite frequency band. The space-based component also may be configured to communicate with a first radioterminal over a first air interface and to communicate with the second radioterminals over a second air interface.

Abstract: A signal power control loop is provided for a link between a terrestrial station and a terminal when the terminal and a satellite are linked via the terrestrial station. The signal power control loop may control transmitted signal power of the terminal and/or the terrestrial station. In some embodiments, the signal power control loop controls transmitted signal power of the terminal and/or the terrestrial station independent of signal power control for a link between the terrestrial station and the satellite.