Abstract: Systems and methods for locating UAV. The methods comprise: causing a physical joining of a payload with a fuselage of the UAV without any modification to the fuselage (where the payload comprises a communication relay configured to perform relay operations to extend a range between users of a communication relay link for voice and data communications and a first locator configured to perform location operations to determine and report a location of the UAV to the users of the communication relay link); using a power source to supply power to the payload that is independent from a main power source used to supply power to avionic electronics of the UAV; and continuing to perform the relay operations by the communication relay and the location operations by the first locator, when power is no longer being supplied to the avionic electronics by the main power source of the UAV.

Abstract: Systems and methods for operating a system. The methods may comprise: using a machine learning model to identify which frequency of a plurality of possible frequencies that can be used by a communication device for wireless communications is an inferred best frequency based on weather report information and/or predicted weather information; performing operations to select a best frequency from the plurality of possible frequencies using the inferred best frequency and a frequency value selected by a link establishment process of the communication device; and causing the communication device to communicate signals with the best frequency which was selected.

Abstract: Systems and methods for operating a cryptographic system. The methods comprise: obtaining ciphertext by the cryptographic system; performing operations by the cryptographic system to determine whether a given sequence of values exits within the ciphertext; and synchronizing the cryptographic system with another cryptographic system using the ciphertext as a bitrate portion of an initialization value for a cryptographic algorithm and zero as a capacity portion of the initialization value for the cryptographic algorithm, when a determination is made that the given sequence of values exist within the ciphertext.

Abstract: A communication system may include a first radio frequency (RF) device configured to generate a Bluetooth Low Energy (BLE) advertisement responsive to an input event, transmit the BLE advertisement in a BLE advertisement burst comprising a number of transmissions in at least one BLE advertising channel, and discontinue transmission of the BLE advertisement after transmission of the BLE advertisement burst. The system may further include a second RF device configured to scan for the BLE advertisement in the at least one BLE advertising channel, and communicate with the first RF device over a BLE data channel responsive to receiving the BLE advertisement.

Abstract: Mobile ad hoc Network (MANET) includes a first node of a plurality of nodes which self-assigns a role as a part of a network-spanning backbone upon a determination by the first node that one or more criteria have been satisfied. The first node uses the network-spanning backbone to facilitate a first-tier control plane communication service within the MANET. The first node also communicates within the MANET using a second-tier control plane communication service separate from the first-tier control plane communication service. The second-tier control plane communication service is used by the first node when communicating exclusively with neighbor nodes that are a 1-hop distance from the first node.

Abstract: A portable radio may include a radio frequency (RF) transmitter, an RF receiver, and an audio input transducer. A controller may store command messages and speech messages, implement a stand-alone, speech recognition and text-to-speech (TTS) function for the stored command messages and stored speech messages. The controller may also control at least one of an RF transmitter and RF receiver of a remote radio based upon an input command matching one of the stored command messages using the audio input transducer and the stand-alone speech recognition and TTS function, and convert a speech message matching one of the stored speech messages into a text message. The RF transmitter may send the text message to the remote receiver.

Abstract: On-demand allocation of communication capacity in a Mobile ad hoc Network (MANET) involves initiating in a first node of the MANET, a request for network communication capacity. The request is initiated by wirelessly transmitting an access request in a first epoch, during an access request time slot of a TDMA waveform. The access request is directed to one-hop neighbor nodes with which the first node can communicate directly. The first node determines whether the access request has been granted based on one or more responses received from the one-hop neighbor nodes. These responses include an indication by each of the one-hop neighbor nodes regarding their availability to accommodate the access request. The first node subsequently uses network communication capacity granted to it for communicating data.

Abstract: Reducing harmonics in a radio transmitter can involve using an electronically tunable harmonic filter (ETHF) in a transmit path at the output of an RF power amplifier stage to reduce harmonic signal components in the RF transmit signal. At least one filter characteristic of the ETHF is selectively controlled using one or more RF switch. The one or more RF switches that are used to control the ETHF can include a CMOS-SOI and/or a MEMs type of switch. Various filter characteristics of the ETHF can be controlled including a bandwidth and/or a center frequency of the ETHF.

Abstract: Communication terminal includes a first microphone system, a second microphone system, and a noise reduction processing unit (NRPU). The NRPU receives a primary signal from the first microphone system and a secondary signal from the second microphone system. The NRPU dynamically identify an optimal transfer function of a correction filter which can be applied to the secondary signal provided by the second microphone system to obtain a correction signal. The correction signal is subtracted from the primary signal to obtain a remainder signal which approximates a signal of interest contained within the primary signal.

Abstract: A mobile ad hoc network (MANET) includes a first MANET node having a first radio frequency (RF) transceiver and a first controller coupled thereto to generate RF transmissions. A second MANET node has a second RF transceiver configured to communicate with the first RF transceiver, and a second controller coupled to the second RF transceiver. The second controller is configured to cooperate with the second RF transceiver to receive the RF transmissions from the first MANET node, generate a normalized reception value based upon the received RF transmissions and send the normalized reception value to the first MANET node. The first controller is configured to control a transmit power level for a subsequent RF transmission based upon the normalized reception value from the second MANET node.

Abstract: An RF device may include RF circuitry having a PIN diode configured to switch an RF signal, and a biasing circuit. The biasing circuit may include a controllable power supply having a control input and an current output coupled to the PIN diode to selectively bias the PIN diode into an ON state, and a feedback circuit coupled between the current output and the control input of the controllable power supply to set a current delivered to the PIN diode in the ON state.

Abstract: A radio frequency (RF) communications system may include an RF transmitter having multicarrier transmitter circuitry that transmits frequency bands over a frequency range. A controller may selectively transmit real information over at least one of the frequency bands and selectively transmits fake information within the frequency range. The controller's operation is based on embedded machine learning model and real-time effectiveness feedback from built-in spectral analyzer. An RF receiver receives the real information from the RF transmitter.

Abstract: Antenna system includes a base structure and a multiplicity of vertebrae arranged in a stack to define a spine. The spine has an elongated length which extends from a base end to a tip end. A compression applicator is configured to apply an elastic compression force on the stack in a direction along the elongated length from the tip end to the base end. Vertebra interfaces associated with each of the adjacent pairs of the vertebrae are configured to facilitate a variable deviation in an angular alignment of a vertebra axis of each vertebra relative to an adjacent one of the vertebra contained in the stack.

Abstract: A cross-domain information transfer system includes a key distribution center that generates private encryption keys and a signature key pair as a secret signing and secret verifying key for an attribute associated with a given domain. A sender device generates ciphertext from plaintext based upon the private encryption key, appends an attribute for a given domain to the ciphertext, generates ciphertext with a concealed attribute based upon the secret signing key and broadcasts the ciphertext with the concealed attribute. Domain gateway devices each receive a respective secret verifying key for an associated attribute, receive the ciphertext with the concealed attribute from the untrusted network, and use the secret verifying key to determine if the concealed attribute matches the attribute associated with the domain gateway device, and, when so, pass the ciphertext to at least one receiver device coupled with the domain gateway device.

Abstract: A communications system may include a transmitter having spreading stages configured to spread a common modulated baseband input data stream based upon respective coefficient sequences; a plurality of upconverters, each having a different frequency; and an RF output stage that generates an RF output signal. A receiver may include an RF input stage that receives an RF input signal, a plurality of downconverters, a plurality of despreading stages, and a demodulator coupled to the despreading stages.

Abstract: Systems and methods for operating a communication device. The methods comprise: concealing the communication device and/or at least one cable in a ballistic wearable item (e.g., a ballistic vest) such that the communication device resides in a storage slot for a trauma plate, where the communication device comprises a frame having a cross-sectional profile that matches a cross-sectional profile of the trauma plate by a given amount (e.g., 75-100%); and performing communication operations by a radio module integrated with the frame of the communication device.

Abstract: A communication system may include a radio frequency (RF) detector and an RF transmitter having a selectable hopping rate and a selectable hopping frequency window. A controller may be configured to operate the RF transmitter at a selected hopping rate and at a selected hopping frequency window based upon the RF detector.

Abstract: Systems (100) and methods (500) for controlling operations of an electronic device. The methods comprise: using a rotary knob having a single rotatable part to select a first circuit to perform operations of the electronic device during a first time and to select a second circuit to perform operations of the electronic device during a second time; and using the single rotatable part of the rotary knob to additionally change preset functions for the first circuit at the first time and a second circuit at the second time, where a degree of rotation of the single rotatable part corresponds to a desired preset function input selected from a plurality of possible preset function inputs.

Abstract: A radio frequency (RF) communication device includes an RF spectral sensor that senses a dynamically changing RF spectral environment, and RF circuitry having at least one settable parameter. A controller dynamically sets the at least one settable parameter thereby affecting power consumption and RF communication performance by using an artificial intelligence (AI) model based upon the power consumption and the RF communication performance in the dynamically changing RE spectral environment.

Abstract: Systems and methods for operating a communication device. The methods comprise: monitoring, by the processor, states of snap-dome based switches of a keypad provided with the communication device; activating, by the processor, a first timer when the snap-dome based switches are simultaneously activated; detecting, by the processor, when maintenance of the communication device is needed based on a value of the first timer; and causing, by the processor, performance of communication device maintenance based on the detecting, for immersion time and immersion depth fatigue.