Abstract: Disclosed is an apparatus for power line communication. More specifically, in order to solve a problem of the conventional art, in which the magnitude of power line communication signals exceeds a reference value allowed in the law, the apparatus controls a communication signal to be selectively output a communication target phase among phases of a three-phase power line. Accordingly, it is possible to maintain the magnitude of the output communication signal to be low. Further, it is possible to reduce distortion of a power signal, caused by the communication signal, and malfunction of other power facilities due to the distortion. Further it is possible to easily and simply perform initiation of the power line communication.

Abstract: In a receiver, there is a precursor iterative canceller (“PIC”) having first and second paths. A postcursor decision block is coupled to the PIC to provide a decision signal thereto. The PIC includes: comparators for receiving an input signal and corresponding threshold inputs for precursor ISI speculation; and select circuits for selecting a first speculative input for the first path and a second speculative input for the second path, respectively associated with a negative precursor contribution and a positive precursor contribution. The first path and the second path in combination include at least a first stage and a second stage for processing the first speculative input and the second speculative input. The decision signal is provided to the first stage and to the select circuits. The select circuits are coupled to receive the decision signal for selection of the first speculative input and the second speculative input.

Abstract: A method for performing mobile communications may include comparing a received digitized signal with a local reference synchronization sequence to generate a plurality of candidate timing estimates. Each of the plurality of candidate timing estimates may represent an estimated temporal location of a synchronization sequence in the received digitized signal. The method may further include demodulating the received digitized signal according to each of the plurality of candidate timing estimates to produce a plurality of reliability metrics, wherein each of the plurality of reliability metrics may be associated with one of the plurality of candidate timing estimates.

Abstract: High-speed data links between a processor and off-chip DRAM utilizes pulse-amplitude-modulation (PAM) signaling to increase data rate for a given bandwidth and resource budget in SoCs. However, the termination resistor used in the transmission line interface between processor and DRAM consumes large amounts of power during PAM signaling. By adding a biasing source between Ground and the termination resistor, the “floor voltage” that the termination resistor uses as a reference for determining signaling levels may be raised. Raising the floor voltage reduces the amount of voltage across the termination resistor and reduces power consumption accordingly. The biasing source is adjusted to various increments of the maximum amplitude of the PAM signaling. A floor voltage of one-half of the maximum amplitude of PAM signaling produces minimum power consumption in the receiver.

Abstract: Digital television (DTV) broadcasting using COFDM modulation is designed to modulate orthogonal frequency-division-multiplexed (OFDM) mid-band carriers with metadata including synchronization signals and transmission-mode signals. DTV signals modulate OFDM carriers occupying portions of the frequency spectrum of the transmission channel that extend in frequency both below and above these mid-band carriers. The OFDM midband carriers are capable of signaling when a new broadcast service is used that differs from the one disclosed. The signaling is provided by modulating the midband carriers with respective elements of signature sequences, each of which signature sequences is composed of Zadoff-Chu sequences and repetitive pseudo-random sequences scrambled by a Zadoff-Chu sequence.

Abstract: A communication device for transmitting a Very High Throughput Signal Field B (VHT-SIG-B) is described. The communication device includes a processor and instructions stored in memory that is in electronic communication with the processor. The communication device allocates bits for the VHT-SIG-B in a backwards compatible preamble. The communication device additionally applies a pilot mapping for the VHT-SIG-B that is the same as a pilot mapping for the DATA field. The communication device further transmits the VHT-SIG-B.

Abstract: In a system including analog circuits of multichannel, channels which have a short distance therebetween are grouped so as to be included in the same group. During a reception period, a common correction signal is supplied to master channels allocated to the respective groups, and received signals are supplied to slave channels other than the master channels. A correction coefficient which tracks a characteristic fluctuation of each group is continuously searched for through continuous comparison between outputs of the respective master channels, and an output of each slave channel is corrected by using the correction coefficient of a group including the slave channel.

Abstract: This method of generating precoders is used in optimising transmission capacity between an eNodeB and UEs in a DL MU-MIMO communication system. The method includes the steps of computing correlation values between pairs of precoding matrices (PMs) of the reported precoding matrix indicators (PMIs) (step 40), selecting a PM pair having a minimum correlation value (step 42). If the minimum correlation value is less than a lower threshold Tmin, the method uses a PM corresponding to the received PMI (step 44). If the minimum correlation value is greater than Tmin and less than an upper threshold Tmax, the method includes the steps of computing correlation values of the reported PMI and Channel Matrices (CMs) from a fixed codebook of representative CMs (step 48), selecting a CM pair having a maximum correlation value (step 52), and computing precoders from the selected CM pair (step 54).

Abstract: In general, the subject matter described in this specification can be embodied in methods, systems, and program products for identifying data that is designated for wireless transmission to a remote computing device. A digital signal that encodes the data for transmission across a band of radio frequency channels is generated. Multiple radio frequency channels in the band that are available are determined. The digital signal is filtered to substantially reduce a power level of the digital signal at frequencies that correspond to channels in the band that have not been determined to be available. The filtered digital signal is converted to an analog signal. The analog signal is provided to an analog transmitter that isolates the band of channels to generate an isolated analog signal and that wirelessly transmits the isolated analog signal over the multiple available channels using one or more antennas.

Abstract: A circuit for receiving data in an integrated circuit is described. The circuit comprises a receiver configured to receive an input signal and to generate output data based upon the input signal, the receiver having a level detection circuit coupled to receive the input signal; and a calibration circuit coupled to the receiver, the calibration circuit having an input for receiving the input signal; an error detection circuit coupled to the input, the error detection circuit coupled to receive the input signal, a first reference voltage and a second reference voltage; and a control circuit coupled to an output of the error detection circuit, wherein the control circuit selectively generates either an offset control signal or an amplitude control signal based upon comparisons of the input signal to the first reference voltage and the second reference voltage. A method of receiving data is also disclosed.

Abstract: A UWB receiver with time drift correction. After a frequency translation by a quadrature demodulator, a pulsed UWB signal received is integrated on successive time windows, and then sampled. A phase shift estimator determines a phase difference between samples separated by a multiple of the sampling period approaching the period of the pulses of the signal. A controller deduces from this phase difference a time offset to be applied to integrators to synchronize the receiver on the signal received.

Abstract: A multi-user MIMO downlink beamforming system with limited feedback (200) is provided to enable precoding for multi-stream transmission, where a channel codeword (ui) and one or more channel quality indicator values (CQIA, CQIB) are computed at the user equipment (201.i) on the basis of maximizing a predetermined SINR performance metric (pi) which estimates the receive signal-to-noise-ratio (SINR) at the user equipment (201.i). The computed codeword (ui) and CQI values (or differential values related thereto) are quantized and fed back to help the base station (210) which applies a correction to the appropriate CQI value in the course of designing the transmit beamforming vectors w and determining the appropriate modulation and coding level to be used for downlink data transmission.

Abstract: A demodulator suitable for demodulating binary FSK signals having a small difference between carrier frequencies uses a counter-timer technique for timing a fixed number FSK cycles and comparing a count value with a threshold when a frequency change is expected. By grouping a number of FSK pulses (or cycles) together in one measurement, speed requirements on the system clock used for the counter/timer measurements can be relaxed and tolerance to noise is also improved. The demodulator is particularly suitable for wireless charging applications.

Abstract: A clock and data recovery (CDR) circuit employing zero-crossing linearizing (ZCL) technique. The circuit including a voltage controlled oscillator (VCO), an inject-locked divider (ILD), a variable delay unit, a linearized loop, a bang-bang loop, and a loop filter (LP). The differential clock generated by VCO passes through ILD for frequency dividing and variable delay unit to generate 8-phase clocks. Then using these clocks, the PDs over-sample the input data, followed by synchronization and logic operation to control the CPs output current pulses. These currents filtered by LP control the VCO to finish the loop. The circuit recovers 4 channel data and corresponding clocks of the input with low power broken-down and preferable jitter performance and locking property.

Abstract: A method for detecting wireless microphone signals based on an augmented spectral correlation function is provided. The method includes obtaining an augmented spectral correlation function (SCF) of acquired digital signals based on a SCF of the digital signal and a conjugate SCF proposed in the present invention, calculating a statistic, and comparing it with a decision threshold simulated or calculated through a predetermined method to determine whether the digital signal is a wireless microphone signal. With the proposed augmented SCF, the present invention overcomes a difficulty in sensing TV white space, namely, the inability of most existing detection methods to effectively distinguish between narrowband interferences and wireless microphone signals. Meanwhile, the detection method has low algorithm complexity and is easy to implement in real systems.

Abstract: Data signals transmitted by a plurality of transmitting antennas over a radio channel are demodulated. The method comprises receiving (202) on a plurality of receiving antennas, a first data signal, a reference signal and a second data signal, the contents of the reference signal being known a priori to the receiver. The contents of the reference signal are used for calculating (204) an estimated polynomial channel matrix and a time reversed version of the same. Polynomial pre-filter matrices are calculated (206, 208) by a decomposition of the estimated polynomial channel matrices into a respective product of a paraunitary polynomial matrix and an upper triangular polynomial matrix with minimum phase filters on its main diagonal, where the polynomial pre-filter matrices are obtained by calculating the paraconjugate of the paraunitary polynomial matrices. The received data signals are demodulated (212) where the received data signals are multiplied with the calculated polynomial pre-filter matrices.

Abstract: A system and method are disclosed for performing on die jitter tolerance testing. A set of clocks are generated based on an input signal. The set of clocks include in an in-phase signal based on the data switching edge of the input signal. Additionally, the set of clocks include an inverted clock phase shifted by 180 degrees, and a pair of clocks phase shifted positively and negatively by a certain number of degrees, ?. Data input is sampled based on the inverted clock and the two phase shifted clocks. The eye opening of the input signal can be determined based on whether each of the inverted clock and the two phase shifted clocks sample the correct data from the input signal at various ? values.

Abstract: A wireless circuit (100) which is capable of simultaneously outputting a plurality of transmission signals, including: a transmission signal selection circuit (31) which selectively outputs a detecting object signal out of a plurality of transmission signals; and a detection circuit (33) which detects a power of the detecting object signal thus outputted. This enables to provide, by use of a compact configuration, a technique for individually detecting transmission signals which are simultaneously generated by a respective plurality of transmission circuits.

Abstract: An apparatus and method for sensing load current of an envelope tracking (ET) modulator enables load impedance of a power amplifier to be measured. Impairments associated with the load impedance characteristic can be suppressed by calibration and predistortion instead of by feedback (as done in the prior art). The ET modulator provides a switching regulator that can be reconfigured as a linear regulator for the purpose of sensing the load current. This allows the ET modulator to be operated open-loop, thereby eliminating the power consumption overhead resulting from utilization of a loop filter and error amplifier (used in the prior art) and achieving a higher overall efficiency.

Abstract: A pre-distortion method. A signal to be transmitted Tx is pre-distorted to compensate for nonlinearities of a transmitter. The pre-distorted signal is filtered by an EBEE filter and a baseband filter. The EBEE filter has a filter characteristic of that cancels the baseband filter response over the range of frequencies from a first corner frequency of the baseband filter to a frequency of N*fB where N is a highest order of distortion component being cancelled and fB is the bandwidth of the original signal to be transmitted. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.