Abstract: A symbol clock recovery circuit for recovering a symbol clock in an M-ary pulse position modulation (PPM) signal. The recovery circuit includes a largest magnitude comparison circuit that selects a largest magnitude signal value from a group of M signal values aligned with a hypothesis symbol boundary location and the average of that largest magnitude value is compared with a threshold, or with results from other boundary location hypotheses, or with both, to determine the true position of the symbol boundary.

Abstract: Disclosed are an apparatus and a method of processing a signal, and a recording medium. The apparatus for processing a signal includes: an estimating unit configured to estimate a first Signal-to-Interference plus Noise power Ratio (SINR) of a reception signal based on transmission path information based on a result of an estimation of a plurality of transmission paths and noise power notified from a wireless reception device; a signal processing unit configured to generate a first modulation symbol by modulating the information bit obtained based on a first modulation order and a first coding rate determined based on the first SINR on a basis of the first modulation order, and a perturbation addition processing unit configured to search for a perturbation vector based on the first modulation symbol generated for each of the plurality of transmission paths, and add the perturbation vector to the first modulation symbol.

Abstract: A semiconductor device including a PLL providing candidate clocks of different phases in response to a first clock received from a reader via an antenna, a phase difference detector detecting a phase difference between the first clock and a clock from the candidate clocks, a phase difference controller that selects another clock from the candidate clocks, and a driver that provides transmission data synchronously with the another clock to the reader.

Abstract: An electric system, method, and computer-readable medium facilitate shared access to a shared power line for communication using a PLC protocol. The electric system, method, and computer-readable medium may determine when the shared power line is available for a transmission, allocate unicast transmission time slots to each of a plurality of inverters, transmit a multicast message requesting that each of the plurality of inverters communicate information during its allocates transmission time slot, determine whether a first inverter in the plurality of inverters did not communicate using the shared power line during its allocated unicast transmission time slot, and if the first inverter did not communicate information during its allocated unicast transmission time slot, transmit with the line interface a jam signal during the first inverter's unicast transmission time slot.

Abstract: A transmitter and a receiver of a multiple input multiple output (MIMO) communication system may use two codebooks to share channel information. When the transmitter uses eight transmit antennas, two codebooks may be defined. When the receiver generates two precoding matrix indicators from two codebooks, a combination of the two precoding matrix indicators may indicate a single precoding matrix. Precoding matrix candidates may also be defined.

Abstract: In some aspects, the disclosure is directed to methods and systems of a multi-input receiver. In one or more embodiments, a receiver receives a plurality of signals each via a respective one of a plurality of wireless channels. In one or more embodiments, a processing stage of the receiver combines the received plurality of signals into a combined signal for input to an analog-to-digital converter (ADC) of the receiver. In one or more embodiments, the ADC generates, at a predetermined sampling frequency, samples of the combined signal. In one or more embodiments, the receiver recovers from the generated samples at least one signal component corresponding to at least one of the plurality of signals.

Abstract: Constant-envelope phase-optimized transmission methods and apparatus are disclosed. An example method includes determining initial values of modulation phases in a first quadrant, the modulation phases associated with binary codes to be transmitted; and optimizing the initial values to second values to enable a product of an objective function to be within a threshold value.

Abstract: A clock and data recovery circuit may include: a phase detection unit configured to generate an early phase detection signal and a late phase detection signal by comparing a clock signal and data; a filtering unit configured to generate an up signal and a down signal based on a number of generation times of the early phase detection signal and a number of generation times of the late phase detection signal; a phase information summing unit configured to receive an output of the filtering unit at each cycle of the clock signal, and generate first and second phase control signals by summing up numbers of the up signals and the down signals received from the filtering unit during a summing-up time; and a phase interpolator configured to adjust a phase of the clock signal according to the first and second phase control signals.

Abstract: Aspects of the present disclosure aim at providing three orthogonal waveforms that can be used for transmitting 3n bits (n bits from each waveform) at a given frequency. Such three orthogonal waveforms can be used in applications such as QAM to create a 3-dimensional QAM, along with use in other like applications such as in Orthogonal frequency-division multiplexing (OFDM), Quadrature Phase Shift Keying (QPSK), Binary Phase Shift Keying (BPSK), among others. In an aspect, a method of the present disclosure includes a step of generating three orthogonal waveforms as cos(?)+k, cos(?+2?/3)+k, and cos(?+4?/3)+k, where k is the DC component and can have a value of 0.5 volts, and ?=2 ?ft with f being the (baseband or passband) frequency=1/T, with T being Time Period, and t being time. Cosine waveforms can be equivalently replaced by sine waveform separated by 120 degrees.

Abstract: In a capacity region of a multiple access channel which is a theoretical limit, a combination of transmission speeds that are equal between the channels is realized. A wireless communication apparatus receives first to third frames, which are sequentially transmitted. The second frame is transmitted at a head time different from that of the first and third frames, and the second frame receives a first signal which is temporally superposed to both the first and third frames. A replica signal of the first frame is generated based on the result obtained by demodulating the first frame, and a second signal which is obtained by canceling it from the first signal is generated. The second frame is demodulated by using the second signal, and the interference from the first frame in the second frame in the second signal is canceled, and the interference from the third frame remains.

Abstract: A system, apparatus and method is described for dynamically boosting (increasing) the power supply voltage to an envelope tracking (ET) modulator within a transmitter system when the target/desired power amplifier voltage supply is above a predetermined threshold (e.g., equal to the available power supply of the system, such as a battery). By boosting the power input supply to the ET modulator, the modulated power supply provided to the power amplifier (PA) is also increased. This reduces or eliminates clipping that normally occurs when the target/desired PA supply voltage is greater than the available power supply voltage and reduces distortion in the transmitted signal.

Abstract: A method of blind tap coefficient adaptation includes receiving a digital data signal including random digital data, equalizing a first portion of the digital data signal using a first set of predetermined tap coefficients and a second portion of the digital data signal using a second set of predetermined tap coefficients. The method includes generating a first eye diagram and a second eye diagram from a first portion and a second portion of an equalized signal, respectively. The first eye diagram is compared with the second eye diagram to determine which of the sets of predetermined tap coefficients results in a data signal having a higher signal quality. The method includes inputting to an equalizer as an initial set of tap coefficients the first set of predetermined tap coefficients or the second set of predetermined tap coefficients according to the determination.

Abstract: Method, apparatus, and article of manufacture for performing digital pre-distortion of wideband analog upconversion chains existing within communications systems. By pre-distorting for the deterministic non-linearities in an analog upconverter, a radiated passband signal will show an improved signal quality which will enhance the ability of a receiver to properly decode received data symbols, as well as perform equalization of the received signal constellation. It is desired that this pre-distortion technique will further improve the signal quality of communication systems who only implement pre-distortion techniques for compression effects due to power amplifiers.

Abstract: A preamble, first and second portions of a data payload of a single data unit, and a midamble included between the first and second portions are generated. The midamble includes calibration information, and is based on a maximum number of space-time streams of a communication channel. A network interface of a communication device generates the preamble, the first and second portions of the data payload, and the midamble. A preamble, first and second portions of a data payload of a single data unit, and a midamble are received. The midamble includes calibration information, and is based on a maximum number of space-time streams. A first and/or a second characteristic is updated based on the midamble. A network interface of a communication device receives the preamble, the first and second portions of the data payload, and the midamble; and updates the first or the second characteristic based on the midamble.

Abstract: Systems and methods are described for transmitting data over physical channels to provide a high bandwidth, low latency interface between a transmitting device and a receiving device operating at high speed with low power utilization. Communication is performed using group signaling over sets of four wires using a vector signaling code, where each wire of a set carries a low-swing signal that may take on one of four signal values. Topologies and designs of wire sets are disclosed with preferred characteristics for group signaling communications.

Abstract: An apparatus relates generally to preconditioning an input signal. In this apparatus, a first digital predistortion module and a second digital predistortion module are for receiving the input signal for respectively providing a first predistorted signal and a second predistorted signal. A combiner is for combining the first predistorted signal and the second predistorted signal for providing an output signal. The first digital predistortion module includes a moving mean block for receiving the input signal for providing a moving mean signal. The first digital predistortion module further includes a digital predistorter for receiving the input signal and the moving mean signal for providing the first predistorted signal.

Abstract: An electronic device including a first transceiver configured to process a first carrier, a second transceiver configured to process a second carrier, a switch, a baseband processor configured to process a first baseband signal and a second baseband signal, which are processed respectively by the first transceiver and the second transceiver, an antenna connected through the switch in association with some of a plurality of reception paths with respect to the first carrier, and a reception path configured to provide the second transceiver with the first carrier received via the antenna connected through the switch to the second transceiver.

Abstract: A digitized signal is processed via an interpolator. The interpolator performs timing adjustment on the digitized signal. The error signal is determined based on a desired signal and the time-adjusted digitized signal. A corrective phase shift of the digitized signal is determined via a least-mean-squared processing block that uses the error and the derivative of a function used by the interpolator. The corrective phase shift is input to the interpolator to perform the timing adjustment.

Abstract: Technology for managing beamformed signals. A method includes: receiving beamformed signals from one or more arrays of receiving elements, which one or more arrays of receiving elements send beamformed signals at given transmission rates; recovering information from the received beamformed signals; measuring a quality of the recovered information, using a metric that estimates a distance between the recovered information and reference information; and, based on the measured quality, instructing the one or more arrays of receiving elements to change the transmission rates at which they send beamformed signals.

Abstract: A multi-band communication system (400). The system includes a plurality of transmit channels (420-1, 420-N), wherein each transmit channel (420-X) transmits data streams through a single sub-band; and a plurality of receive channels (460-1, 460-N), wherein each receive channel (460-X) receives data streams of a single sub-band. In an embodiment of the invention, each transmit channel (420-X) and its respective receive channel (460-X) are configured with a different set of channel codes to encode and decode the data. The set of channel codes is determine by an adaptive modulation coding (AMC) controller (461-X) based on the condition of the link between a transmit channel (420-X) and a receive channel (460-X).