Abstract: The disclosed technology relates to systems and methods for emulating a massive MIMO beamforming antenna array of arbitrary size—a channel model between a transmitter and a receiver, with one or more signal paths having respective amplitudes, angles of arrival, angle spreads, and delays. The disclosed technology includes defining a complete channel model H, calculating the correlation matrix for the channel, grouping the base antenna elements of the antenna array by combinations of signal and polarization, and calculating observed beamforming power of each group of the base elements, by applying a cross-correlation matrix to determine observed power signals and delay of each signal at each remote antenna element of the user equipment. Emulation includes supplying cross-correlated signals to remote antenna elements of user equipment during a RF test of the user equipment. Disclosed technology includes a channel emulator that generates output streams for testing user equipment for multiple users.

Abstract: A semiconductor device for generating a transmission clock in a sink without a reference clock and a method of transmitting data from the sink to a source by use of the generated transmission clock are provided. The sink may include: a receiver configured to generate a digital control oscillator code by using a phase difference between a reception clock of a data signal received from a source and a recovered clock and configured to recover data from the data signal by using the recovered clock recovered by the generated digital control oscillator code; and a transmitter configured to generate a transmission clock by the digital control oscillator code having the recovered clock locked to the reception clock and configured to transmit return data to the source by using the transmission clock when a return data request identifier is received from the source.

Abstract: Various embodiments include an apparatus to be employed by an enhanced Node B (eNB), the apparatus comprising communication circuitry to receive, from a user equipment (UE), feedback information and control circuitry, coupled with the communication circuitry, to identify a codeword from a three-dimensional codebook based on the feedback information received from the UE, wherein the communication circuitry is further to precode data to be transmitted to the UE based on the codeword. An apparatus to be employed by a UE and additional methods are described.

Abstract: Embodiments are provided for cross-polarized antennas design with different down tilt angles that support versatile functionality, such as for MIMO or beamforming. An embodiment antenna circuit comprises a baseband signal processor, a pair of RF transmitters coupled to the baseband signal processor, a pair of PAs coupled to the RF transmitters, a 90°/180° hybrid coupler coupled to the RF transmitters, a pair of duplexers and two antennas coupled to the PAs. The two antennas are down tilted at different down tilt angles. A pair of signals is generated using the baseband signal processor, transmitted by the RF transmitters, and amplified using the PAs. Additionally, a 90° or 180° phase difference is introduced into the signals using the 90°/180° hybrid coupler. After the amplifying and introducing the phase difference, the signals are polarized at two different polarizations and down tilted at different down tilt angles using the two antennas.

Abstract: A method for transmitting a signal that includes the steps of: determining the beam width of a beam to be transmitted; determining, on the basis of the beam width, relative narrowband transmit power (RNTP) information indicating whether a transmission power of at least a predetermined critical value is transmitted to a predetermined resource block; transmitting the RNTP information to an adjacent cell; and transmitting the generated beam to the resource block according to the RNTP information. Also provided is a method for configuring an RNTP value for controlling inter-cell interference in a communication system.

Abstract: Apparatuses, methods, and systems for MIMO inter-stream interference cancellation are disclosed. One method includes determining a channel matrix between a plurality of transmitting antennas of a transmitter and a plurality of receiving antennas of a receiver, determining a plurality of channel propagation delays based on a propagation delay between each of the plurality of transmitting antennas and each of the plurality of receiving antennas, preprocessing, by the transmitter, streams of symbols for each transmitting antenna for transmission based on the plurality of channel propagation delays and based on the channel matrix, and transmitting, by the transmitter, the preprocessed symbol streams through the plurality of transmitting antennas.

Abstract: A system includes a pseudorandom binary sequence (PRBS) generator configured to generate a first PRBS and a second PRBS and an exclusive-OR logic configured to exclusive-OR the first PRBS and the second PRBS to compute a third PRBS. The system also includes an adder, a correlator and a corrector. The adder adds the third PRBS to input data to compute summed data for transmission of the summed data across the channel. The correlator computes the exclusive-OR of the first PRBS and the second PRBS to reproduce the third PRBS and correlates output data from the channel to the reproduced third PRBS to compute a channel gain error and a channel memory error. The corrector extracts the input data from the output data from the channel using the computed channel gain and memory errors.

Abstract: In an example of this disclosure, a method may include receiving, by a bit error location analyzer, a split information signal at a second data rate derived from an information signal at a first data rate. In this example, the second data rate is less than the first data rate, and the bit error location analyzer may be incapable of performing error analysis at the first data rate The method may include performing error analysis, by the bit error location analyzer, on information represented by the split information signal. In some examples, performing error analysis may include comparing the information represented by the split information signal to an information seed to determine a plurality of bit error locations in the information represented by the split information signal relative to the information seed.

Abstract: A node is configured to be connected to a massive multiple-input, multiple-output (MIMO) array to provide spatially multiplexed channels to a plurality of user equipment in an unlicensed frequency band. The node includes a processor configured to allocate a number of degrees of freedom of the massive MIMO array to interference suppression based on an outcome of a first listen-before-talk (LBT) operation performed by the node to acquire the unlicensed frequency band. The processor is also configured to generate a spatial filter based on the number of degrees of freedom allocated to interference suppression. The node also includes a transceiver configured to perform a second LBT operation using the spatial filter.

Abstract: In one example embodiment, a system including a plurality of ports, a plurality of vectoring processors, each of the plurality of vectoring processors having a coefficient memory storing vectoring coefficients corresponding to different victim line and disturber line combinations of a plurality of communication paths connected to the plurality of ports, at least one victim line associated with two of the plurality of vectoring processors and a controller, the controller being configured to assign the victim line and disturber line combinations to the memories based on loads associated with the vectoring coefficients.

Abstract: An integrated circuit (IC) memory controller includes receiver circuitry to receive read data from a memory. The receiver circuitry includes equalization circuitry having at least one tap to apply data level equalization to the read data, and a tap weight adapter circuit. The tap weight adapter circuit adaptively generates a data level tap weight corresponding to the data level equalization from an edge analysis of previously received read data.

Abstract: Embodiments relate to a receiver (310) for receiving a multicarrier signal. The multicarrier signal comprises a first frequency block with a first group of subcarriers, the first frequency block being filtered with a first frequency block specific sideband suppression filter (106-1) for sideband suppression outside of said first frequency block, and at least a second frequency block with at least a second group of subcarriers, the second frequency block being filtered with a second frequency block specific sideband suppression filter (106-2) for sideband suppression outside of said second frequency block. The receiver (310) comprises a filter module (320) operable to perform an inverse sideband suppression filter operation for the first and at least the second frequency block.

Abstract: A microwave receiver includes a magnetoresistive element to which a microwave is input, a magnetic field application unit, and a DC bias current application unit. The magnetoresistive element includes a free magnetic layer, a fixed magnetic layer, and a nonmagnetic spacer layer interposed between the free magnetic layer and the fixed magnetic layer. The magnetic field application unit applies a magnetic field to the free magnetic layer. The DC bias current application unit applies a DC bias current to the magnetoresistive element, and includes an input terminal. The DC bias current is made variable by adjusting a DC voltage that is applied to the DC bias current application unit via the input terminal.

Abstract: Various aspects described herein relate to generating a waveform for transmitting in wireless communications. A plurality of segments of a waveform are generated. An overlap-and-add is performed in at least a phase domain at one or more boundaries between the plurality of segments. The waveform can be transmitted.

Abstract: A wireless radio-frequency transmission apparatus includes a phase frequency detector, a charge pump, a loop filter and a twin voltage-controlled oscillator. The twin voltage-controlled oscillator includes a first oscillator and a second oscillator. When the twin voltage-controlled oscillator is in a reception mode, the first and the second oscillators are coupled to each other to form a quadrature voltage-controlled oscillator, and the quadrature voltage-controlled oscillator, the phase frequency detector, the charge pump and the loop filter constitute a phase-locked loop to generate quadrature carriers. When the twin voltage-controlled oscillator is in a transmission mode, the first oscillator, the phase frequency detector, the charge pump and the loop filter constitute a phase-locked loop, and the second oscillator performs frequency modulation on transmitted data.

Abstract: Methods and devices for common channel low PAPR signaling are disclosed having a power amplifier set configured to transmit broad-beam signals over a frequency band narrower than the available bandwidth and modulated with a low PAPR sequence. A second power amplifier set may be configured to transmit narrow-beam unicast signals.

Abstract: A clock recovery method and device relate to the field of communication; and address the problem of the non-synchronization between the sampling clock of the transmitter and the sampling clock of the receiver. The method includes calculating a clock sampling error, a signal phase error compensation value, and a residual phase error compensation value based on data obtained after polarization demultiplexing and equalizing; adjusting a sampling clock based on the clock sampling error; performing phase adjustment for the first time based on the signal phase error compensation value; performing phase adjustment for the second time based on the residual phase error compensation value. The technical scheme provided by the embodiments of the present document is adapted to a coherent data receiver, and achieve the mechanism of the three levels of error compensation.

Abstract: A semiconductor apparatus includes a pattern conversion circuit configured to generate conversion data in response to a monitoring enable signal, pattern select signals and parallel input data; a transmission circuit configured to output the conversion data as serial data in response to a plurality of clocks; a reception circuit configured to output the serial data as parallel output data in synchronization with the plurality of clocks; and a monitoring circuit configured to generate a result signal in response to the plurality of clocks, clock select signals and the serial data.

Abstract: A serial data channel includes a transmitter that encodes data using a PAM-4 where each symbol is represented by one of four signal levels comprising two balanced pairs of differential signal levels, and a de-emphasis circuit. The circuit determines that a symbol represents as a first instance of a first signal state, determines that a next symbol represents a second instance of the first state, and determines that a third symbol is represented as a second state. The circuit determines that the second state is of a same balanced pair as the first state and, in response, provides a de-emphasis to the second symbol. The circuit determines that the second state is of a different balanced pair as the first state and, in response, provides the de-emphasis and a correction factor to the second symbol.

Abstract: A method of suppressing interference in a communication sent over a channel includes assessing characteristics of channel-induced distortion in a channel, and applying pre-distortion to a signal sent over the channel. The pre-distortion is based on the assessed characteristics of the channel-induced distortion.