Abstract: A space-based component, such as a satellite, is configured to receive wireless communications from radiotelephones in a satellite footprint over an uplink satellite radiotelephone frequency, and to transmit wireless communications to the radiotelephones over a downlink radiotelephone frequency. An ancillary terrestrial network, that may include one or more ancillary terrestrial components, is configured to transmit wireless communications to, and receive wireless communications from, the radiotelephones over the uplink satellite radiotelephone frequency in a time-division duplex mode.

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 space-based component, such as a satellite, is configured to receive wireless communications from radiotelephones in a satellite footprint over an uplink satellite radiotelephone frequency, and to transmit wireless communications to the radiotelephones over a downlink radiotelephone frequency. An ancillary terrestrial network, that may include one or more ancillary terrestrial components, is configured to transmit wireless communications to, and receive wireless communications from, the radiotelephones over the downlink satellite radiotelephone frequency in a time-division duplex mode. By terrestrially transmitting and receiving wireless communications over the downlink satellite radiotelephone frequency in a time-division duplex mode, interference at the space-based component and/or at the gateway, by the ancillary terrestrial network and/or the radiotelephones due to terrestrial reuse of cellular satellite frequency spectrum, may be reduced or eliminated.

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: Processing return feeder link signals at a satellite gateway including a first and second receive antennas includes receiving first and second return feeder link signals at the first and second receive antennas, respectively, modulating a phase of the first return feeder link signal to form an adjusted first feeder link signal, combining the adjusted first feeder link signal with the second return feeder link signal to form a combined feeder link signal, detecting periodic amplitude variation in the combined feeder link signal, and shifting a phase of the first return feeder link signal to reduce periodic amplitude variation in the combined feeder link signal.

Abstract: A radioterminal communications system includes an ancillary terrestrial component configured to receive from at least some of a plurality of radioterminals using frequencies from a first satellite frequency band (e.g., an L-band) and to transmit to at least some of the plurality of radioterminals using frequencies from a second satellite frequency band (e.g., an S-band). The system further includes a space-based component configured to communicate with the plurality of radioterminals using at least some of the frequencies from the first satellite frequency band and/or at least some of the frequencies from the second satellite frequency band. In some embodiments the ancillary terrestrial component communicates with radioterminals using a Time Division Duplex (TDD) mode and the space-based component communicates with the same or other radioterminals using a Frequency Division Duplex (FDD) and/or a TDD mode.

Abstract: A wireless communications system configured for Low Probability of Intercept (LPI), Low Probability of Detection (LPD) and/or Low Probability of Exploitation (LPE) communications may use waveforms substantially devoid of a cyclostationary signature to improve a LPI/LPD/LPE property. A set of M independent “seed” waveforms that satisfy a time-bandwidth constraint may be used via a Gram-Schmidt Orthogonalization (GSO) procedure to generate M orthonormal functions. In accordance with exemplary embodiments, the M seed waveforms may be chosen from a band-limited Gaussian-distributed process and may be used to generate, via an orthogonalization operation a corresponding set of M Gaussian-distributed orthonormal functions substantially devoid of a cyclostationary property.

Abstract: A radioterminal may include a transceiver, a hands-free interface, and a satellite/hands-free interlock. The transceiver may be configured for space-based communications and for terrestrial wireless communications. The satellite/hands-free interlock may be configured to prevent the transceiver from transmitting space-based communications unless the hands-free interface is activated. Related methods are also discussed.

Abstract: Two satellite communications systems can use the same frequency or frequencies in geographically overlapping footprints, without creating undue interference in a given system that is caused by the same frequency signal(s) that is/are used by the other system. In particular, an aggregate Effective Isotropic Radiated Power (EIRP) of the radioterminals and/or ancillary terrestrial components of a second satellite communications system in the common footprint is sufficiently low, and/or the receive antenna gain of a first satellite communications system is sufficiently low compared to the receive antenna gain of the second satellite communications system, so as to increase an aggregate receiver noise that is seen by the first satellite system receivers by an amount that does not substantially change a Quality of Service (QoS) of the first satellite communications system.

Abstract: A system according to some embodiments includes a first transceiver configured to transmit downlink signals to, and to receive uplink signals from, a first plurality of mobile terminals in a geographic area using a telecommunications resource, and a resource coordination controller coupled to the first transceiver and configured to communicate with a second telecommunications system including a second transceiver configured to transmit downlink signals to, and receive uplink signals from, a second plurality of mobile terminals within the geographic area using the telecommunications resource. The resource coordination controller may be further configured to coordinate use of the telecommunications resource by the first transceiver and/or the first plurality of mobile terminals based on use of the telecommunications resource by the second transceiver and/or the second plurality of mobile terminals.

Abstract: Numerous embodiments are provided that may be used to provide enhanced capacity and/or Quality-of-Service for OFDM-based systems such as LTE and/or WiMAX. Various service/device modes and/or applications are also provided. According to embodiments of the invention, a transformation may be performed on a data vector by a transmitter, prior to the transmitter transmitting the data vector, to distribute elements of the data vector over an available frequency space, thus providing robustness to channel anomalies such as fading and/or interference. The transformation may be based upon a Fourier transform or a truncated Butler matrix. At a receiver, an inverse of the transformation may be applied to recover data. The receiver and/or transmitter may be configured with an antenna array that may comprise a two-dimensional lattice of antenna elements, and may further be configured to estimate a number of resolvable signal paths and to form a spatial filter/rake that is matched to the number of resolvable signal paths.

Abstract: A cellular communications system includes a wireless transmitter that is configured to transmit over a set of frequencies that is assigned to a given cell of the cellular communications system from a band of frequencies that is assigned to the cellular communications system. A controller is configured to identify a power level to be used by the wireless transmitter and to determine a subset of frequencies in the set of frequencies that is assigned to the given cell of the cellular communications system, the subset of frequencies to be assigned to the wireless transmitter responsive to the power level that was identified. Related methods are also described.

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 inter-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 radioterminal may include a transceiver, a hands-free interface, and a satellite/hands-free interlock. The transceiver may be configured for space-based communications and for terrestrial wireless communications. The satellite/hands-free interlock may be configured to prevent the transceiver from transmitting space-based communications unless the hands-free interface is activated. Related methods are also discussed.

Abstract: A first and/or a second communications system may provide communications service over a geographic area. A method of operating the first and/or the second communications systems may include generating a measure of aggregate interference reaching a satellite of the second communications system substantially from devices of the first communications system. The measure of aggregate interference reaching the satellite of the second communications system may be transmitted to an element of the first communications system.

Abstract: Systems and/or methods are disclosed for generating a waveform that comprises a plurality of elements by using a Fourier transform and/or an inverse Fourier transform. The waveform that comprises the plurality of elements may be transmitted by transmitting, sequentially in time, the plurality of elements. In some embodiments, the Fourier transform and/or inverse Fourier transform comprises a Fast Fourier Transform and/or Inverse Fast Fourier Transform and the waveform that comprises the plurality of elements may be transmitted by using, sequentially in time, the plurality of elements to modulate a single carrier frequency.

Abstract: A radioterminal includes a receiver that is configured to receive information from a base station by receiving a first measure of the information from the base station and a second measure of the information from a second device. The second device receives a measure of the information from the base station, responsively generates the second measure of the information and transmits the second measure of the information to the radioterminal over a short-range wireless link. Related methods are also described.

Abstract: A radioterminal includes a wireless communications transceiver, a GPS receiver and a controller. The controller is configured to authorize at least one other radioterminal to receive geographic position information of the radioterminal, to activate the GPS receiver to obtain a measure of a geographic position of the radioterminal and to activate the wireless communications transceiver to transmit the measure of the geographic position of the radioterminal to the at least one other radioterminal that was authorized, responsive to a rate of change of position of the radioterminal. Related methods also are described.

Abstract: A system for communications on an extraterrestrial body may include a space-based component and an ancillary extraterrestrial component on the extraterrestrial body. The space-based component may be configured to provide wireless communications with a plurality of radioterminals located on the extraterrestrial body over a satellite frequency band wherein the space-based component includes at least one satellite orbiting the extraterrestrial body. The ancillary extraterrestrial component may be configured to provide wireless communications with the plurality of radioterminals located on the extraterrestrial body. Moreover, the ancillary extraterrestrial component may reuse at least one satellite frequency of the satellite frequency band, and the space-based component and the ancillary extraterrestrial component may be configured to relay communications therebetween. Related methods are also discussed.

Abstract: Methods of reducing interference in a satellite communications system may include receiving a plurality of feeder link signals and time aligning the plurality of feeder link signals to provide time aligned feeder link signals. At least two of the time aligned feeder link signals may be combined to provide reduced interference of at least one of the feeder link signals. Related systems are also discussed.