Abstract: Amplifier for an ultra-wideband (UWB) signal receiver having a signal input (15) for receiving an ultra-wideband signal which is sent by a transmitter (1) and which is transmitted in a sequence of transmission channels (K.sub.i) (which each have a particular frequency bandwidth) which has been agreed between the transmitter (1) and the receiver (4); a transistor (18) whose control connection is connected to the signal input (15); a resonant circuit (26, 30, 31) which is connected to the transistor (18) and whose resonant frequency can be set for the purpose of selecting the transmission channel (K.sub.i) in line with the agreed sequence of transmission channels; and having a signal output (29) for outputting the amplified ultra-wideband signal, the signal output being tapped off between the transistor (18) and the resonant circuit.

Abstract: A transmitter device arranged to encode a set of digital input data into a succession of modulated chirps, whereby said digital input data are encoded according to a Gray code into codewords (320, 321, 322) having a plurality of bits, and having an interleaver that distributes the bits (C00, . . . Cnn) of each codeword into a series of digital modulation values (S0, . . . S7), at different bit positions, and to synthesize a series of modulated chirps whose cyclical shifts are determined by the modulation values. A special frame structure is defined in order to ensure high robustness, and variable bit-rate flexibility.

Abstract: A receiver 10 and method in the receiver for cell search to find an actual base station having a carrier frequency in a radio communications network 1. The receiver detects a first signal representative of a base station 12, 14, 16, 18 by performing slot synchronisation, frame synchronization, cell identification, measurement of a signal quality of the first signal and comparison of the measured signal quality with a first threshold value. When a first signal having a signal quality that is greater than the first threshold value has been detected, the receiver searches for at least one second signal representative of a base station for at least one frequency offset comprised in a set of offsets S3. Further, when one or more second signals are detected, the receiver selects the signal with the highest signal quality, and detects a broadcast radio channel representative of a base station for the selected signal.

Abstract: Circuits and techniques for operating an integrated circuit (IC) are disclosed. A disclosed circuit includes a divider circuit that is operable to receive a first signal at a first speed and output a second signal at a second speed based on the first signal. A recovery circuit is coupled to the divider circuit. The recovery circuit is operable to determine the frequency of the second signal and is further operable to generate a first ready signal and a recovered clock signal based on the second signal. A phase aligner circuit, operable to align a phase of the second signal with a phase of the recovered clocks signal based on the first ready signal, is coupled to the recovery circuit.

Abstract: Transmitter observation receivers and methods are described that can predistortion-compensate transmitters capable of operating in multiple communication bands and frequency ranges. Such observation receivers and method involve generating at least one compensation signal such that a signal to be transmitted that is within a bandwidth that simultaneously encompasses multiple frequency ranges is compensated.

Abstract: A receiver termination circuit includes an internal AC coupling capacitor and an adjustable resistor forming an adjustable high-pass filter (HPF) at a receiver side of a transmission medium, and a digital-to-analog converter (DAC) coupled to the adjustable HPF, the DAC configured to provide a signal having a low-pass filter response to the adjustable HPF to provide a DC restore function.

Abstract: An adaptive equalization system and operating method thereof are disclosed herein. According to an embodiment, an apparatus comprises a plurality of equalizers and control logic to selectively enable one or more equalizers of the plurality of equalizers and disable one or more other equalizers of the plurality of equalizers based, at least in part, on a quality of the channel over which the signal is received. In another embodiment, the apparatus includes first control logic to select an equalizer for a header of a packet and second control logic to select an equalizer for a data payload of the packet.

Abstract: Technologies related to task management across low-power wireless communications are generally described. In some examples, proximal devices in range of low-power wireless communications may cooperate to allow one or more of the proximal devices to suspend task operations, while one or more of the proximal devices manage the task operations. The task operations may be associated with an energy consumption that exceeds an energy consumption associated with the low-power wireless communications, allowing the proximal devices that suspend task operations to reduce their overall energy consumption.

Abstract: A method and apparatus provide for stable signal demodulation in a communication system. The method and apparatus includes including detecting an erroneous demodulation value based on backward-demodulation of received signals, using a difference between a received signal to be demodulated and a preceding signal of the received signals and correcting the error demodulation value. Alternatively, backward-demodulation is used to confirm received signals.

Abstract: Logic may determine phase correction information from pilot tones. Logic may determine phase correction information from some of the pilot locations. Logic may process the shifting pilot tones for less than all of the pilot tones. Logic may process pilot tones at any location within orthogonal frequency division multiplexing (OFDM) packet. Logic may determine to process only pilot tones at the even or odd symbol indices or subcarriers. And logic may transmit a packet with a frame with a capabilities information field comprising an indication that a receiver may can process shifting pilot tones for phase tracking.

Abstract: During a communication session, a filter in the RAN may filter signals sent over the communication pathway. When the filter filters signals sent over communication pathway, it may also cause some filter loss in the signals. The amount of the filter loss may vary as a function of frequency. Before the start of a communication session, the RAN may determine a filter loss for a given frequency. Because a higher filter loss indicates the RAN will transmit (or receive) a weaker signal, it may be undesirable to transmit signals to WCDs that are located a far distance from the RAN with frequencies having high filter losses. Thus, once the RAN has determined a filter loss for a given frequency, the RAN may reserve the given frequency for use in communication between the RAN and at least one WCD based on a distance between the WCD and the RAN.

Abstract: A device for generating a vector-modulated output signal based on a baseband signal having an in-phase component and a quadrature component, a first LO signal for the in-phase component of the baseband signal and a second LO signal for the quadrature component of the baseband signal comprises a baseband combination circuit, which is configured to combine the in-phase component and the quadrature component in order to obtain a plurality of combined IQ signals. Furthermore, the device includes a plurality of mixer cells for generating the vector-modulated output signal, based on the combined IQ signals, the first LO signal and the second LO signal.

Abstract: A method for activating a SIM card and obtaining balance in real-time, comprising the following steps: the user obtains a SIM card and inserts the SIM card in a mobile communication device; after starting the device, it interface automatically displays the prompting message for registration and activation, and the user completes the registration and activates the SIM card. In the meantime, a preset application program is installed on the SIM card mobile communication device, and the user forms operating record by starting the preset application program. After receiving the operating record, a remote server matches the balance to be obtained and sends the instruction to the telecommunication provider. The docking server firstly verifies the identity validity of service provider, then adjusts the balance of SIM card in real-time and feeds back the balance to the remote server and the remote server feeds back the balance to the user.

Abstract: The present disclosure includes systems and techniques relating to time-varying notch filter. In some implementations, an apparatus includes a time-variant notch filter and a controller. The time-variant notch filter includes a notch depth and a notch bandwidth. At least one of the notch depth or the notch bandwidth is based on a coefficient of the notch filter. The controller is configured to set at least one of the notch depth to a first depth or the notch bandwidth to a first bandwidth by setting a value of the coefficient to a first value during a ramp-up of the notch filter before a packet is received. The controller is also configured to set at least one of the notch depth to a second depth or the notch bandwidth to a second bandwidth by adjusting the value of the coefficient to a second value after the packet is received.

Abstract: Testing a Decision Feedback Equalizer (‘DFE’), the DFE including a summing amplifier operatively coupled to a plurality of latches and an input signal line for receiving a data signal, including: preventing a differential data signal from being received by the summing amplifier; and iteratively for each tap to be tested: setting a tap coefficient for each tap to zero; setting an output of the plurality of latches to a predetermined value; setting a tap coefficient for the tap to be tested to a full scale value; and determining whether a resultant output signal from the DFE matches a predetermined expected output signal.

Abstract: A communication system performs communication using a pulse width modulation code as a transmission code. The communication system includes a plurality of nodes that are connected via a transmission line to be capable of communicating with each other. Each of the nodes including a driver circuit. The driver circuit includes a transistor that enables and blocks conduction between the transmission line and a ground line. The plurality of nodes includes a master node and a slave node. The master node is one of the plurality of nodes. The slave node is at least one node other than the master node among the plurality of nodes. The master node includes a limiter that restricts, when the transistor of the driver circuit is turned off, changes in a conductive state of the transistor.

Abstract: A clock recovery circuit for recovering a clock signal from a clock-embedded data signal, a data receiving device for recovering a clock signal and a data signal from a clock-embedded data signal, and a data transmitting and receiving system for improving the protocol of a clock-embedded data signal. The data transmitting and receiving system includes a data transmitting device configured to transmit a clock-embedded data signal in which an embedded clock signal is embedded in a data signal; and a data receiving device configured to recover a clock signal corresponding to the embedded clock signal from the clock-embedded data signal.

Abstract: In various embodiments, a system comprising a network interface, a processor, and a non-transient memory medium operatively coupled to the processor is disclosed. The memory medium is configured to store a plurality of instructions configured to program the processor to receive a digital bit stream, transform the digital bit stream to an encoded digital bit stream. The encoded digital bit stream comprises at least one of a gateway channel, a composite channel, or a data channel, and any combination thereof, and provides the encoded digital bit stream to the network interface for transmission. A non-transitory computer-readable memory medium and a computer-implemented method also are disclosed.

Abstract: Versatility and flexibility of integrated circuits can be accomplished by remote control via a serial interface, such as SPI. Read/write accesses to the SPI slave node can be achieved according to SPI protocol by the master node. Additionally, a state machine associated to the slave node SPI needs a local clock to exercise the control of the analog functions following a write access. The serial protocol defines a serial data word transfer to comprise a number of reserved clock cycles that are not assigned for communicating a data bit value of the data word. The slave device comprises a clock unit coupled to the serial clock line for providing a derived clock based on reserved clock cycles. The derived clock is used internally in the slave device to perform internal synchronous operations.

Abstract: Various wireless precoding systems and methods are presented. In some embodiments, a wireless transmitter comprises an antenna precoding block, a transform block, and multiple transmit antennas. The antenna precoding block receives frequency coefficients from multiple data streams and distributes the frequency coefficients across multiple transmit signals in accordance with frequency-dependent matrices. The transform block transforms the preceded frequency coefficients into multiple time domain transmit signals to be transmitted by the multiple antennas. The frequency coefficients from multiple data streams may be partitioned into tone groups, and all the frequency coefficients from a given tone group may be redistributed in accordance with a single matrix for that tone group. In some implementations, the frequency coefficients within a tone group for a given data stream may also be precoded. In some alternative embodiments, tone group preceding may be employed in a single channel system.