Abstract: A line card of a network box receives a SYNC input signal and generates a first time stamp based on receipt of the SYNC input signal. The line card generates a system clock signal in a phase-locked loop and generates a SYNC output signal by dividing the system clock signal in a divider circuit. The SYNC output signal is fed back to an input terminal as a SYNC feedback signal. A time stamp is generated based on receipt of the SYNC feedback signal. The line card determines a time between the SYNC input signal and the SYNC feedback signal based on the first time stamp and the second time stamp. The timing of the SYNC output signal is adjusted based on the time difference using a coarse time adjustment by adjusting a divide ratio of the divider circuit and using a fine time adjustment in the phase-locked loop based on a residue of a remainder of the time difference not accounted for by the coarse time adjustment.

Abstract: The present disclosure relates to an apparatus and method of processing a digital signal, wherein an input signal is transformed into the frequency domain by applying a fast Fourier transformation (FFT) processing to obtain a transformed input signal. Positive and negative frequency components of the transformed input signal are separated and respective ones of the separated positive and negative frequency components are separately processed by respective digital filtering to obtain filtered frequency components. The filtered frequency components are combined in the frequency domain using a down-sampling operation for down-sampling the filtered frequency components from an input number of samples per symbol to a different output number of samples per symbol, and the combined output components are converted into the time domain by applying an IFFT processing.

Abstract: A model structure modeling a power amplifier is based on at least a binomial expansion, a first building block, a second building block, and a third building block. The first building block is a first complex sub-band signal with a first delay, the second building block is a multiplication of the first complex sub-band signal with a second delay and a complex conjugate of the first complex sub-band signal with a third delay, and the third building block is a multiplication of a second complex sub-band signal with a fourth delay and a complex conjugate of the second complex sub-band signal with a fifth delay. The sum of the first complex sub-band signal and the second complex sub-band signal is a baseband signal. Terms are obtained by optimizing delay combinations for the model structure. The model structure is used to dual-band digital pre-distortion of the baseband signal.

Abstract: Complex transfer functions indicating characteristics of propagation between transmission antenna elements and N reception antenna elements are calculated from reception signals received by the N reception antenna elements during a predetermined period. Components affected by vital activity are extracted from the calculated complex transfer functions. A correlation matrix is calculated from changed components affected by vital activity. A steering vector for regions divided from a target region is calculated. A living-body signal intensity vector is estimated by performing compressed sensing for an unknown value that is the living-body signal intensity vector using a correlation matrix vector and an extended steering vector.

Abstract: Techniques to enable dynamic bandwidth management at the physical layer level while maintaining backwards compatibility in wireless systems is provided. Furthermore, techniques for reducing the occurrence of exposed nodes are provided. A transmitter may transmit a frame including an indication that a PHY layer sub-header defining a bandwidth associated with a channel is present. Furthermore, the transmitter may transmit a third frame after receiving a second frame from a receiver to indicate to legacy stations that the TXOP was successful.

Abstract: Embodiments for a method and apparatus are described for non-linear noise cancelation and in phase quadrature (I/Q) modulation error correction. The embodiments include receiving a signal, the signal including a plurality of data segments. A first data segment in the received signal is demodulated and decoded to produce a recovered segment of a bitstream. At least one correction factor is applied to a first demodulation support element and a second demodulation support element during demodulation of a second data segment in the received signal. The correction factor is determined based on the received first data segment and a representation of the first data segment reconstructed from the recovered segment of the bitstream.

Abstract: Circuits and methods for reducing the cost and/or power consumption of a user terminal and/or the gateway of a telecommunications system that may include a telecommunications satellite. Embodiments include “chained” feedback-regulated voltage supply circuits. These circuits substantially eliminate the need for separate regulator circuits for each regulated voltage. These circuits are designed to automatically maintain a substantially constant first voltage at a first node for a first load and maintain a substantially constant second voltage at a second node for a second load. Some disclosed configurations of these circuits may be useful to achieve greater current capability at the same voltage without requiring larger switches and higher inductor and capacitor sizes that may be needed in a single (conventional) stage voltage supply circuit.

Abstract: Disclosed are a codebook-based signal transmission and reception method in a multi-antenna wireless communication system and an apparatus therefor.

Abstract: An integrated circuit includes: a phase-shifted data signal generation circuit configured to generate a plurality of phase-shifted data signals from an input data signal based on at least one phase-shifted clock signal; a synchronization circuit configured to generate a plurality of synchronization data signals by applying the at least one phase-shifted clock signal to the plurality of phase-shifted data signals provided by the phase-shifted data signal generation circuit; and a control signal generation circuit configured to perform logic operations on the plurality of synchronization data signals to generate a phase control signal for controlling a phase of the at least one phase-shifted clock signal, and generate a frequency control signal for controlling a frequency of the at least one phase-shifted clock signal.

Abstract: Disclosed is a field device adapter for wireless data transfer, comprising: an adapter housing having a first and a second end, the first end such that the field device adapter can be mechanically connected to a field device and the second end such that a two-wire cable can be connected to the field device adapter. The adapter housing also having an adapter chamber; a supply electronics unit arranged in the adapter chamber and designed to provide a supply voltage via a voltage tap; an adapter electronics unit; and an adapter connection cable at the first end for connecting the adapter electronics to a field device electronics. The adapter electronics are designed to communicate the two-conductor signals between the field device electronics and the two-conducting-wire cable and also to convert the two-conductor signals into radio signals or vice versa.

Abstract: A device includes a digital frontend. The digital frontend is configured to digitally modulate symbols for digital signals of a plurality of channels according to a transmission protocol. Each channel is associated with at least one respective carrier frequency within a transmission bandwidth. The digital frontend is further configured to combine the digital signals to obtain a digital output signal. The device further includes an analog frontend having a digital-to-analog converter configured to convert the digital output signal into an analog output signal. The analog frontend also includes a programmable gain amplifier configured to apply an analog gain to the analog output signal. The device further includes a control logic configured to determine the analog gain based on calibration data indicative of the frequency response of the analog frontend across a transmission bandwidth.

Abstract: A transmission module is provided that includes a transmitter, a loopback receiver, and a QEC controller. The QEC controller identifies quadrature imbalance in the transmitter based at least one a comparison of the data signals at the output of the loopback receiver with data signals at the input of the transmitter. Based on the comparison, the QEC controller can adjust one or more characteristics of the transmitter to correct quadrature errors in the transmitter.

Abstract: A communications device including a receiver configured to receive a plurality of sub-units of an encoded transport block of data in a plurality of time-divided units within frequency resources of a wireless access interface allocated to the mobile terminal, each of the sub-units being received a repeated number of times within a repetition cycle; and circuitry configured to combine a same sub-unit received the repeated number of times to form a composite sub-unit to recover the transport block.

Abstract: A method and apparatus for calibrating a phased array antenna system is disclosed. The method includes receiving a first transmission signal transmitted from a transmitting antenna device, receiving a second transmission signal that is generated by the transmitting antenna device based on an unoccupied frequency band of a receiving array antenna system and a bandwidth of the frequency band, and generating a calibration matrix to calibrate a plurality of antenna elements included in the receiving array antenna system based on a signal magnitude and a phase difference which are calculated for each of the antenna elements using the first transmission signal and the second transmission signal.

Abstract: Disclosed are a transmitter capable of cancelling simultaneous switching noise while ensuring low costs and a small area and a data transmission method in the same. The transmitter includes an encoder configured to convert input data of two levels (1 and 0) into data of three levels (+1, 0, and ?1) and an output unit configured to output the data converted by the encoder. Here, the encoder adds 1 bit to the input data such that the number of bits corresponding to logic 1 becomes an even number. In addition, a specific correlation is established between currents or voltages corresponding to at least two levels of levels “+1”, “0”, and “?1” so that “+1” and “?1” corresponding to the logic 1 are alternately arranged and a current flowing through a power line or a ground line is constant regardless of the input data.

Abstract: In accordance with one or more embodiments, a communication system includes a transmitter configured to generate a first communication signal conveying data. A first coupler is configured to generate first guided electromagnetic waves in response to the first communication signal, wherein the first guided electromagnetic waves are guided by an external surface of a metallic shield of a underground power cable and propagate, without requiring any electrical return path, via a wave mode having a majority of field strength within the protective jacket of the underground power cable.

Abstract: A system that incorporates aspects of the subject disclosure may perform operations including, for example, identifying network communication degradation associated with communications taking place in part over a radio frequency link between a plurality of communication devices, directing one or more communication devices of the plurality of communication devices to send one or more test packets, receiving the one or more test packets, and analyzing the one or more test packets to locate a source of the network communication degradation at one or more layers of a multi-layered communication protocol. Other embodiments are disclosed.

Abstract: A wireless receiver including a front end circuit, an adaptive threshold circuit, and a correlator. The front end circuit converts a wireless signal into a series of digital symbols. The adaptive threshold circuit provides an adaptive correlation threshold that is adapted based on a sync word. The correlator correlates the digital symbols with the sync word using the adaptive correlation threshold. The adaptive correlation threshold may be based on amplitude attenuation of the digital symbols that correspond to transitions of the sync word. The adaptive threshold circuit may be a lookup table that stores different threshold values each corresponding to one of multiple different sync words. Alternatively, the adaptive threshold circuit may be implemented as an evaluation circuit that determines the adaptive correlation threshold based on expected amplitude attenuation of the digital symbols that correspond to transitions of the sync word.

Abstract: Embodiments described herein provides a system for detecting data received in a low power low rate (LPMR) data frame format. The system includes a receiver and control circuitry. The receiver is configured to receive a data frame comprising an LPLR preamble portion and an LPLR data portion following the LPLR preamble portion. The LPLR preamble portion and the LPLR data portion occupy a bandwidth that is less than an allowed bandwidth. The control circuitry is configured to determine a mode of the data frame based on whether the data frame has an additional portion, and detect data field in the LPLR preamble portion from the data frame based on the mode of the data frame.

Abstract: Described herein are methods and systems for connecting via a cable a USB host and USB device over distances equal to greater than 50 meters. The methods and systems include having the host and device each send a pilot signal over the cable and the host and device, each detecting that the received pilot signal is valid. After confirming the validity of the pilot signals, the host begins standard USB protocols with the device. The system and methods also allow for the insertion of a power over Ethernet device into the cable to provide power to a remote USB device. In some embodiments, only the D+ and D? lines are used allowing multiple independent USB connections over the cable.