Abstract: Embodiments of the disclosure provide a system for operating a radio frequency (RF) network having a plurality of communication nodes. A network transceiver communicates with communication nodes in the RF network. A computing device coupled to the network transceiver performs actions including: evaluating a state of the RF network using a machine learning model, based on a spectrum environment and a communication objective, generating a set of communication parameters based on the state of the RF network, causing the network transceiver to communicate with the a communication node using the generated set of communication parameters, and modifying the machine learning model based on a result of causing the network transceiver to communicate with the communication node.

Abstract: An electronic device may include wireless circuitry with a baseband processor, a transceiver, and an antenna. The transceiver may include a transmit path, a receive path, and a loopback path that couples the transmit path to the receive path. A passive all-pass filter may be interposed on the loopback path. Control circuitry may calibrate I/Q mismatch of the wireless circuitry using the all-pass filter to optimize the radio-frequency performance of the wireless circuitry. Performing I/Q mismatch calibration using the all-pass filter may serve to minimize area consumption in the transceiver, may minimize calibration time, and may allow for calibration over a relatively wide bandwidth.

Abstract: A holding device for an electronic device having a video display. The holding device including: a first part configured to hold the electronic device; and a second part rotatably arranged relative to the first part, the second part arranged to oppose the video display, the second part having a portion configured to fix to a user's clothing. Wherein when the portion of the second part is fixed to the user's clothing, the first part is rotatable relative to the second part between a first position and a second position, a first angle between the first part and the second part in the first position is smaller than a second angle between the first part and the second part in a second position to permit the user to view the video display in a hands-free manner in the second position.

Abstract: A terminal supporting dual receive single transmit-dual subscriber identity module (SIM) dual standby (DR-DSDS) includes a first SIM card interface and a second SIM card interface, and the first SIM card interface is configured to communicate with a first SIM card, and the second SIM card interface is configured to communicate with a second SIM card. The terminal is configured to, when the terminal is in a first communication connection, receive a paging request for establishing a second communication connection, and when the paging request carries a first identifier indicating a second service, respond to the paging request to establish the second communication connection.

Abstract: Disclosed are passive reflector radio communications systems, such as for UHF frequencies or greater than UHF frequencies, and related deployment systems and devices that provide underground communications. Embodiments of the system include reflector elements to provide passive radio communications, structural frameworks to support and orient the reflector elements, methods for calculating reflector size, shape, and position corresponding to a desired wavelength, and deployment methods and devices to install the communication system at a desired location. The passive reflectors can be placed in a folded or otherwise compact mode, for transport into underground tunnels. Once at the desired installation location, the system can be installed, with the reflectors positioned appropriately for the radio frequencies used at the location.

Abstract: An RF power detector controls an amplitude of a replica input signal so that a power of the replica input signal substantially equals a power of an input signal to the RF power detector. A signal generator generates the replica input signal responsive to a digital control word. A feedback circuit adjusts the digital control word responsive to a comparison of output signals from an analog power sensor.

Abstract: A film structure, a method for manufacturing the film structure, a shell, and an electronic device are disclosed. The film structure includes a first film assembly and a second film assembly. The first film assembly includes a first film and a texture layer stacked sequentially. The second film assembly includes a second film and a ribbon unit disposed on the second film. The second film assembly is laminated on the first film assembly. The ribbon unit is located adjacent to the first film, and an orthographic projection of the ribbon unit projected on a plane on which the texture layer is located falls in the texture layer.

Abstract: A holder for a handheld communication device includes a body having an absorbing unit at front side thereof; a backing unit installed at a back side of the body; and the backing unit including: a pivotal unit and a supporting sheet pivotally retained to a standing sheet of the pivotal unit; that is, the supporting sheet being rotatable around the another end of standing sheet of the pivotal unit; a position embedding the magnet of the supporting sheet being opposite to a position embedding a magnet of the plane sheet of the pivotal unit; and wherein when the supporting sheet is expanded to be parallel to the plane sheet of the pivotal unit, by the magnetic property, the supporting sheet is steadily retained to the pivotal unit without vibration.

Abstract: An input receives a radio frequency (RF) signal having an interfering component superimposed thereon. The RF signal is mixed with a local oscillator (LO) signal and down-converted to an intermediate frequency (IF) to generate a mixed signal which includes a frequency down-converted interfering component. The mixed signal is amplified by an amplifier to generate an output signal. A feedback loop processes the output signal to generate a correction signal for cancelling the frequency down-converted interfering component at the input of the amplifier. The feedback loop includes a low-pass filter and a amplification circuit which outputs the correction signal.

Abstract: In one implementation, a circuit can include a reference pin and an operational amplifier that can include an output pin, an inverting input pin and a non-inverting input pin. The inverting input pin can be electrically coupled to the output pin via a first impedance and to the reference pin via a second impedance. The non-inverting input pin can be electrically coupled to the reference pin via a third impedance and can be configured to receive a detection signal. The reference pin can be configured to receive a detection reference signal associated with the detection signal.

Abstract: Described are concepts, systems, devices and methods that enhance decoding performance of channels subject to correlated noise. The concepts, systems, devices and methods can be used with any combination of codes, code-rates and decoding techniques. In embodiments, a continuous realization of effective noise is estimated from a lead channel by subtracting its decoded output from its received signal. This estimate is then used to improve the accuracy of decoding of an otherwise orthogonal channel that is experiencing correlated effective noise. In this approach, channels aid each other through the post-decoding provision of estimates of effective noise. In some embodiments, the lead channel is not pre-determined, but is chosen dynamically based on which of a plurality of decoders completes first, or using soft information including an estimate of effective noise that is least energetic or most likely to have occurred.

Abstract: Disclosed herein are silicon-on-insulator (SOI) switches and associated control circuits having level shifters configured to provide increased voltages (positive and/or negative) to the switches. The disclosed level shifters can be configured to provide increased voltages and can be used with high-linearity switches and/or can improve the linearity of switches. The improved switch performance can improve front end module performance for applications such as carrier aggregation (CA) and multiple input multiple output (MIMO) as well as with protocols such as Long-Term Evolution Advanced (or LTE-A).

Abstract: A system includes a plurality of readers and an information processor. The reader includes a first communicator, an antenna, and a first processor. An antenna communicates with radio tags. The first processor measures a time in which radio waves are received with a plurality of channels in a carrier sense time, the carrier sense time being a time in which the radio tags are not communicating and transmits a channel report indicating a time in which radio waves are received with each channel to the information processor through the first communicator. The information processor includes a second communicator and a second processor. The second processor acquires the channel report through the second communicator and generates an aggregate report indicating channel states while the plurality of readers are not communicating with the radio tags based on the plurality of acquired channel reports.

Abstract: A radio transceiver device comprises a transmit amplifier, a receive amplifier, an impedance matching circuit portion, and an antenna connection node for connection to an antenna. The impedance matching circuit portion is arranged between the antenna connection node and each of the transmit and receive amplifiers. The impedance matching circuit portion comprises a switch and an inductor and is arranged such that, in a receive mode of operation, the switch is first state and incoming signals from the antenna pass to the receive amplifier via the inductor. In a transmit mode of operation, the switch is in a second state and the transmit amplifier is coupled to a power supply rail VDD via the inductor.

Abstract: A virtual SIM card acquisition method, including: using a first SIM card to register a wireless network and establishing a connection with a server through a packet data service of the wireless network; sending a virtual SIM card acquisition request to the server based on the connection between the subscriber terminal and the server; receiving the virtual SIM card data sent from the server and acquiring connectable carrier information of the virtual SIM card; and sending the virtual SIM card acquisition request to the server again if the connectable carrier information of the virtual SIM card is inconsistent with the carrier information of the roaming area of the first SIM card, and completing acquisition of the virtual SIM card when the connectable carrier information of the virtual SIM card is consistent with the carrier information of the roaming area of the first SIM card.

Abstract: A radio receiver comprises a local oscillator arrangement and a controller. The local oscillator arrangement is arranged to provide a signal for down-conversion of radio frequency signal to an intermediate frequency or a baseband frequency in the radio receiver, and the local oscillator arrangement is capable of selectably providing multiple frequency generation qualities. The controller is arranged to estimate a tolerable frequency generation quality for the current operation of the radio receiver or determine whether the current operation of the radio receiver is satisfactory in sense of a currently provided frequency generation quality, and based on the estimation or determination adjust frequency generation quality of the local oscillator arrangement by selecting one of the multiple frequency generation qualities. A radio arrangement, a method and a computer program are also disclosed.

Abstract: A system for achieving a clean separation of signal and noise. The system comprises a plurality of electronic filters and specially designed radio transmitters and receivers. The system is configured to monitor a signal source for various parameters. The system observes the operating noise and the after-effect of the previous discrete signal. The system utilizes linear algebra equations to filter signals by frequency, shape, duration, or time position in order to more effectively separate the signal from noise, by forgoing the theoretical principle of maximum likelihood.

Abstract: A double-antenna radio frequency power detection circuit comprises a radio frequency transceiver, a switching module, a first power detection module, a second power detection module, a first antenna, and a second antenna. The switching module outputs a radio frequency signal received from the radio frequency transceiver, to the first power detection module or the second power detection module according to a switching signal. The first power detection module or the second power detection module respectively detects the transmit power of the radio frequency signal passing through the first antenna or the second antenna, and gives a feedback to the radio frequency transceiver.

Abstract: A device is provided that includes a logic processor, a power storage cell, a sensor, a wireless logic and a power source. The power source is configured to harvest power in response to exposure to radio frequency (RF) energy using an antenna element of the device. The harvested power is transferred to the power storage cell such that when the power storage cell has a usable amount of power the logic processor (a) samples data using the sensor, (b) processes the sample data into a message that is encrypted, and (c) transmits the message using the wireless logic to an end node that is configured to receive the message from the device. When usable amount of power is not present in the power storage cell during any one of (a)-(c), data is saved in persistent memory until additional harvested power is present in the power storage cell.

Abstract: Communication device with configurable antenna interface and method for configuring an antenna interface. One implementation of the communication device includes an RF transceiver, a threaded coaxial antenna connector, a first RF terminal, a second RF terminal, an RF signal conduit, and an interface circuit. The threaded coaxial antenna connector includes inner and outer terminals. The RF signal conduit includes a first structure that couples the first RF terminal to the inner terminal of the threaded coaxial antenna connector. The RF signal conduit further includes a second structure that couples the second RF terminal to the outer terminal of the threaded coaxial antenna connector. The interface circuit is configured to set an SMA antenna interface mode by coupling the RF transceiver to the first RF terminal. The interface circuit is also configured to set a ferrule antenna interface mode by coupling the RF transceiver to the second RF terminal.