Abstract: Aspects of the subject disclosure may include, for example, a system that performs operations including detecting a signal degradation of electromagnetic waves guided by a transmission medium, and adjusting at least one phase of signal components of the electromagnetic waves to produce adjusted electromagnetic waves having a hybrid wave mode and a non-optical frequency range to mitigate the signal degradation. Other embodiments are disclosed.

Abstract: A digital signal processing method and apparatus is described. The digital processing apparatus comprises a coarse carrier recovery module for performing a coarse carrier compensation of a received modulated signal; and a trellis-based equalization module selectable between a first mode for performing a trellis-based equalization to compensate a residual inter-symbol interference of the received modulated signal and a second mode for performing a trellis-based equalization to compensate a residual phase noise of the received modulated signal.

Abstract: A signal receiver with adaptive software information adjustment of a communication system is provided. The signal receiver receives a modulated signal comprising a plurality of packets, and includes: a demodulating circuit, configured to demodulate the modulated signal to generate a plurality of sets of soft information corresponding to each packet; a software information adjusting circuit, coupled to the demodulating circuit, configured to adjust the sets of soft information according to a distribution of the sets of soft information corresponding to each packet; a quantizer, coupled to the soft information adjusting circuit, configured to quantize the adjusted sets of soft information to generate a plurality of sets of data; and a decoder, coupled to the quantizer, configured to decode the data.

Abstract: Various embodiments relate to a device for reducing noise in a received signal, the device including a memory; a processor configured to: receive a signal containing narrow band noise which was transmitted over a channel and received at an analog front end; add two separate delays to the signal to generate a first delayed signal and a second delayed signal; apply an adaptive noise cancellation using the first delayed signal and the second delayed signal to estimate the narrow band noise; and remove the narrow band noise based upon the estimated narrow band noise.

Abstract: A communication device receives a transmitted signal from another communication device. This transmitted signal is generated within the another communication device based on predetermined digital data. The communication device then generates a first reference signal based on a copy of the predetermined digital data and subtracts the first reference signal from the transmitted signal to generate a first residual signal. The communication device then identifies at least one adaptation parameter based on the first residual signal and adapts the first reference signal using the at least one adaptation parameter to generate a second reference signal so that a first characteristic of the transmitted signal and a second characteristic of the second reference signal are approximately equal.

Abstract: A method for generating a physical layer (PHY) data unit includes generating a first signal field to include multiple copies of first signal field content, wherein the first signal field content spans one sub-band of a plurality of sub-bands of the PHY data unit, and wherein the multiple copies collectively span the plurality of sub-bands of the PHY data unit; generating a second signal field to include multiple copies of second signal field content, wherein the second signal field content spans multiple ones of the plurality of sub-bands of the PHY data unit, and wherein the multiple copies of the second signal field collectively span the plurality of sub-bands of the PHY data unit; generating a preamble of the PHY data unit to include at least the first signal field and the second signal field; generating the PHY data unit to include at least the preamble.

Abstract: Provided is a method of blindly estimating WCDMA OVSF of a signal analyzer, which includes: (a) setting SF to 512 and an index thereof to 0; (b) calculating a power average value of a symbol obtained by despreading descrambled data with an OVSF code set by increasing the index from ‘0’ by ‘1’; (c) determining an OVSF code by which the power average value is equal to or greater than a power reference value as a used OVSF code candidate and determining an OVSF code by which the power average value is less than the power reference value as an unused OVSF code; (d) comparing a zero crossing rate of a symbol with a reference value to determine whether the OVSF code candidate is the used OVSF code; and (e) repeating (b) to (d) while reducing the SF half by half until the SF is equal to 4.

Abstract: In various embodiments, a power-line communication apparatus provides data over a power-line communication network by transmitting data symbols to endpoint circuits over a power line. The power-line communication apparatus includes a signal-processing circuit configured to combine a plurality of different data streams, each of the plurality of different data streams respectively formatted according to different communication schemes, to form a signal that represents a combination of the different data streams and corresponding communication schemes. Further, the power-line communication apparatus includes a pulse-modulation circuit configured to convert the signals, as combined, as a pulse-width modulated or a pulse-density modulated signal, the pulse-modulation circuit configured to switch at a frequency higher than frequencies of the different communication schemes.

Abstract: At least one crosstalk probing sequence out of a set of orthogonal crosstalk probing sequences is assigned to the at least one respective disturber line for modulation at the given carrier frequency of at least one respective sequence of crosstalk probing symbols, and error samples are successively measured by a receiver coupled to the victim line at the given carrier frequency while the at least one sequence of crosstalk probing symbols are being transmitted over the at least one respective disturber line are fed back for crosstalk estimation. The received error samples are next correlated with at least one unassigned crosstalk probing sequence out of the set of orthogonal crosstalk probing sequences for detection of a demapping error in the received error samples.

Abstract: The data are communicated from a transmitter to a receiver in a wireless communications network. Data symbols are modulated using a coded modulation to produce modulated symbols and the modulated symbols are precoded using a precoder matrix to produce precoded symbols. The precoder matrix is formed using a rotation matrix including phase angles for at least some elements of the rotation matrix with values determined according to a parametric function of indices of the elements storing the phase angles. Next, the data packets are formed using the precoded symbols and the data packets are transmitted over the wireless network. Multi-stage parametric phase precoding provides full-diversity and full-rate transmissions by using fast-transformable unitary matrices and deterministic diagonal phase rotation, whose phase angles are pre-determined to minimize the union bound for time-selective and frequency-selective fading channels.

Abstract: A calibration device includes reference signal normalizing units 5-1 to 5-M that set, as a reference signal, a frequency domain signal being associated with either one 2 of reception antennas and being included in frequency domain signals obtained by conversions made by Fourier transform units 4-1 to 4-M, and divide the frequency domain signals after the conversion made by the Fourier transform units 4-1 to 4-M by the reference signal, thereby normalizing the frequency domain signals, and reference frequency normalizing units 6-1 to 6-M that normalize the frequency domain signals normalized by the reference signal normalizing units 5-1 to 5-M by using a signal having a reference frequency included in the frequency domain signals.

Abstract: One embodiment of the present invention relates to a method for transmitting a device-to-device (D2D) signal from a first user equipment in a wireless communication system, wherein the signal transmission method comprises the steps of: deciding a physical resource block through frequency-hopping; and mapping data onto the physical resource block that is decided, wherein a hopping offset value common to a first cell and a second cell is used for the frequency-hopping, when a second user equipment for receiving the signal belongs to the second cell, which is not the first cell to which the first user equipment belongs.

Abstract: Circuits, devices, methods for decision feedback equalization are described. A decision feedback circuit can include L N-tap decision feedback equalizer (DFE) branches. The L N-tap DFE branches can include K unrolled DFE branches, and L?K unfolded DFE branches. Each DFE branch can include a pre-computation stage configured to generate a set of tap-adjusted inputs, each tap-adjusted input corresponding to a possible value for at least one previous output of the same DFE branch. Each unrolled DFE branch can include a multiplexer circuit having selection lines for selecting from the set of tap-adjusted inputs for the unrolled DFE branch, the selection lines being connected to outputs of other DFE branches. Each unfolded DFE branch can include a multiplexer circuit configured to select at least one output from the set of tap-adjusted inputs based on tap-adjusted inputs from other DFE branches.

Abstract: A wireless communication device has an analog control loop circuitry that generates an analog control signal to adjust a phase of a voltage controlled oscillation signal, in accordance with a phase of a reception signal, a digital control loop circuitry that generates a digital control signal having a frequency determined by a frequency of a reference signal and a predetermined frequency setting code signal and having a phase opposite to a phase of the analog control signal, a voltage controlled oscillator that generates the voltage controlled oscillation signal, on the basis of the analog control signal and the digital control signal, and a data slicer that generates a digital signal obtained by digital demodulation of the reception signal, on the basis of a comparison result of the digital control signal and a predetermined threshold value.

Abstract: A predictive decision feedback equalizer using body bias of one or more field effect transistors (FETs) to provide an offset for a predictive tap. In one embodiment, a predictive tap of the predictive decision feedback equalizer includes a differential amplifier composed of two FETs in a differential amplifier configuration, and the body bias of one or both FETs is controlled to provide an offset in the differential amplifier. In one embodiment a current DAC driving a DAC resistor is used to provide the body bias voltage, and a feedback circuit, including a replica circuit forming the maximum possible DAC output voltage, is used to control the bias of the current sources of the current DAC.

Abstract: Disclosed is a method performed by a radio unit (10) operable in a base station system of a wireless communication network, for reducing interference at the RU. The base station system comprises a baseband unit (30) the radio unit (10) and a plurality of radio heads (21-26) wherein the radio unit is connected to the plurality of radio heads via a number of metallic conductors (40), and wherein a signal is to be communicated to the radio unit at a first frequency range over one of the number of metallic conductors from one of the plurality of radio heads.

Abstract: A wireless communication device has an analog control loop circuitry that generates an analog control signal to adjust a phase of a voltage controlled oscillation signal, in accordance with a phase of a reception signal, a digital control loop circuitry that generates a digital control signal having a frequency determined by a frequency of a reference signal and a predetermined frequency setting code signal and having a phase opposite to a phase of the analog control signal, a voltage controlled oscillator that generates the voltage controlled oscillation signal, on the basis of the analog control signal and the digital control signal, and a data slicer that generates a digital signal obtained by digital demodulation of the reception signal, on the basis of a comparison result of the digital control signal and a predetermined threshold value.

Abstract: A nonlinear compensating apparatus and method, a transmitter and a communication system are provided. The apparatus includes a preprocessor configured to preprocess a transmitted signal according to a pre-obtained preprocessing coefficient and a predistorter configured to perform predistortion for the preprocessed signal, and a result of comparison of a characteristic parameter of the signal that has been preprocessed and then predistorted with that of the transmitted signal satisfies a predetermined condition. By preprocessing the transmitted signal at the transmitter end, the embodiments of the present disclosure may perform efficient nonlinear compensation only needing to measure at the transmitter end and without needing to perform many times of measurement at the receiver end, and may lower complexity of circuits of the communication system and complexity of calculation.

Abstract: There is provided beam forming using a dual polarized antenna array. A first set of reference signals for acquiring channel state information is alternatingly transmitted using a dual polarized antenna array in a first polarization direction and in a second polarization direction, respectively. Quantized channel information based on the first set of reference signals is received from a radio transceiver device. Angular information relating to the radio transceiver device is determined based on the quantized channel information. Transmission beams for transmission to the radio transceiver device are determined. The transmission comprises precoder vectors and have relative orthogonal polarizations for beam forming according to the angular information.

Abstract: A signal generation system can include an input source configured to provide an input radio frequency (RF) signal, a correction filter calculation (CFC) block configured to determine correction filter parameters, and an automatic level control (ALC) loop configured to provide ALC loop information to the CFC block. The correction filter parameters may be determined based at least in part on the ALC information. The system can also include a predistortion field programmable gate array (FPGA) configured to apply a correction filter to the input RF signal, wherein the correction filter is based at least in part on the correction filter parameters, and an RF output configured to provide an RF output signal.