Abstract: Embodiments of the present application disclose a spreading method, a spreading control method, and apparatuses thereof. The spreading method comprises: determining a first combined spreading code to be used at least according to first information associated with spreading by using combined spreading codes, the first combined spreading code comprising N spreading codes, and N being an integer not less than 2; and spreading N data units by using the first combined spreading code, wherein the N data units comprise at least one first unit and at least one second unit, the at least one first unit comprises data to be sent, and the at least one second unit is configured to recover the at least one first unit. The methods and apparatuses of the embodiments of the present application can effectively solve the problem of an insufficient number of orthogonal spreading codes by using combined spreading codes.

Abstract: In a system, known digital representations are generated, and test analog signals are generated using the known digital representations. The test analog signals are transmitted using a transmitter of a transmission system. The test analog signals are received using a receiver of the transmission system and used to generate test received digital representations. The test received digital representations are cross-correlated with the known digital representations to generate a mixing matrix. The mixing matrix is inverted to generate a de-mixing matrix, which is applied to subsequent digital data to be encoded onto a signal and transmitted by the transmitter to generate pre-compensated digital data.

Abstract: Under one aspect, a method for reducing interference in a received signal can include splitting a received signal into a first portion and a second portion, the received signal comprising a desired signal and an interference signal that spectrally overlaps the desired signal. The method also can include estimating an amplitude A(t) of the first portion as a function of time. The method also can include suppressing at least a portion of the interference signal in the estimated amplitude A(t) to generate an interference suppressed amplitude A?(t). The method also can include delaying the second portion by an amount of time corresponding to the estimation and suppression. The method also can include multiplying the interference suppressed amplitude A?(t) by the delayed second portion to obtain an output having reduced contribution from the interference signal.

Abstract: An apparatus includes a radio frequency (RF) receiver, which includes a digital signal arrival (DSA) detector to detect arrival of a transmitted signal. The DSA detector includes a signal correlator and at least one of (a) an absolute received signal strength indication (RSSI) detector; (b) a relative RSSI detector; and (c) a frequency offset detector). The RF receiver further includes a demodulator coupled to the DSA detector to demodulate a received signal and to provide a demodulated signal, and a synchronization word detector (SWD) coupled to the demodulator to receive the demodulated signal.

Abstract: An outphasing transmitter includes a decomposition block, first and second power amplifiers, and a dual-polarized antenna in a phased array antenna panel. The decomposition block decomposes a composite input signal into first and second decomposed RF signals. The first and second decomposed RF signals are coupled to the first and second power amplifiers. The first power amplifier is coupled to a vertically-polarized probe, and the second power amplifier is coupled to a horizontally-polarized probe. A plurality of dual-polarized antennas may be utilized. The first power amplifier is coupled to each vertically-polarized probe; while the second power amplifier is coupled to each horizontally-polarized probe.

Abstract: Embodiments of the invention include a tunable radio frequency (RF) communication module that includes a transmitting component having at least one tunable component and a receiving component having at least one tunable component. The tunable RF communication module includes at least one piezoelectric switching device coupled to at least one of the transmitting and receiving components. The at least one piezoelectric switching device is formed within an organic substrate having organic material and is designed to tune at least one tunable component of the tunable RF communication module.

Abstract: This disclosure describes systems, methods, and devices related to multiple-input and multiple-output (MIMO) beamforming. A device may determine one or more short sector sweep frames associated with one or more antennas of the device. The device may cause to set one or more fields of at least one of the one or more short sector sweep frames to indicate an MIMO communication with one or more first devices. The device may identify one or more response frames from at least one of the one or more first devices based at least in part on the one or more short sector sweep frames.

Abstract: Embodiments of the invention provide a decoder (10) for decoding a signal received through a transmission channel in a communication system, the signal carrying information symbols selected from a given set of values and being associated with a signal vector, the transmission channel being represented by a channel matrix. The decoder comprises: a sub-block division unit (12) configured to divide the received signal vector into a set of sub-vectors in correspondence with a division of a matrix related to said channel matrix; at least one weighting coefficient calculation unit (14) configured to calculate a sub-block weighting coefficient for each sub-vector, at least one symbol estimation unit (11) for recursively determining estimated symbols representative of the transmitted symbols carried by the data signal from information stored in a stack.

Abstract: A configurable transceiver includes a first transmitter, an edge rate controller, a second transmitter, a subtractor, a bandwidth controller and a main controller. The first transmitter is configured to generate a first signal for transmission via a transmission link. The second transmitter is configured to generate a replica signal associated with the first signal. The edge rate controller is communicatively coupled to the first and/or second transmitter and is configured to control an edge rate parameter of the first and/or second signal. The subtractor is configured to subtract the replica signal from a signal received via the transmission link. The bandwidth controller is configured to control a bandwidth parameter of a difference signal received from the output of the subtractor. The main controller chooses edge rate and bandwidth control words per desired link rates. It can also automatically find the maximum possible link speed.

Abstract: The present invention is directed to data communication. In a specific embodiment, a known data segment is received through a data communication link. The received data is equalized by an equalizer using an adjustable equalization parameter. The output of the equalizer is sampled, and a waveform is obtained by sweeping one or more sampler parameters. The waveform is evaluated by comparing it to the known data segment. Based on the quality of the waveform, equalizer parameter is determined. There are other embodiments as well.

Abstract: A device for detecting an interference signal includes an estimator configured to estimate a mean value of received signals output from an analog-digital converter (ADC), a filter configured to filter a low frequency band of the received signals using the estimated mean value to produce filtered received signals, a detector configured to detect, from the filtered received signals, interference signals using a coherent modulation scheme and a non-coherent modulation scheme, and a combiner configured to determine whether interference exists in a frequency channel in response to a result of the interference signal detecting using the coherent modulation scheme and the non-coherent modulation scheme, based on a preset condition.

Abstract: Described is a method of searching of multichannel signal and technique of demodulating and detecting DBPSK frequency division multiple access (FDMA) ultra-narrow band signal. A search is based on algorithm encompassing a signal-processing signal, and technique to demodulate and detect FDMA ultra-narrow band together with a method to increase time-frequency resolution.

Abstract: A receiver (100) is provided for signals of different signal strengths and modulated with respective pseudorandom noise (PN) codes. The receiver (100) includes a correlator circuit (120) operable to correlate the signals with a selectable locally-issued PN code having a Doppler and a code lag to produce a peak, the correlator circuit (120) being subject to cross correlation with a distinct PN code carried by least one of the signals that can produce cross correlation; and a cross correlation circuit (370, 400) operable to generate a variable comparison value related to the cross correlation as a function of values representing a Doppler difference and a code lag difference between the locally-issued PN code and the distinct PN code, and to use the variable comparison value to reject the peak as invalid from cross correlation or to pass the peak as a valid received peak.

Abstract: A transceiver comprises local oscillator circuitry, phase noise determination circuitry, mixing circuitry, and digital signal processing circuitry. The local oscillator circuitry is operable to generate a local oscillator signal. The phase noise determination circuitry is operable to introduce a frequency-dependent phase shift to the local oscillator signal to generate a phase-shifted version of the local oscillator signal. The mixing circuitry is operable to mix the local oscillator signal and the phase-shifted version of the local oscillator to generate a baseband signal having an amplitude proportional to a phase difference between the local oscillator signal and the phase-shifted version of the local oscillator signal. The digital signal processing circuitry is operable to process the baseband signal to determine a phase error of the local oscillator signal, and perform signal compensation based on the determined phase error.

Abstract: Disclosed is a method for supporting device-to-device (D2D) communication to which multiple-input and multiple-output (MIMO) technology is applied in a wireless communication system. The method for supporting D2D communication includes receiving, from a transmission end, a resource configuration associated with transmission and reception of a first reference signal and D2D data of a D2D resource pool in an uplink resource; transmitting, to the transmission end, the first reference signal related to at least one first antenna port of the D2D terminal through an uplink resource according to the resource configuration; receiving, through the uplink resource, D2D data and a second reference signal from at least one second antenna port among a plurality of second antenna ports of the transmission end determined based on the first reference signal; and decoding the received D2D data based on a precoding applied to the second reference signal.

Abstract: A transmitter includes: a null symbol map unit to determine a null symbol arrangement pattern by combining different unit patterns determining positions of data symbols and null symbols; a subcarrier map unit to assign, in a two-dimensional space defined by a plurality of subcarriers for use in multicarrier transmission and a time series represented in units of time determined in accordance with a single symbol, transmission data to positions of data symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern; a modulator to generate the data symbols by modulating the assigned transmission data, assign null symbols having a power of 0 to positions of null symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern, and generate transmission symbols of the respective subcarriers; and a baseband section to output a baseband signal based on the transmission symbols.

Abstract: A four-level pulse amplitude modulation transmitter and corresponding method are provided. The transmitter includes a most significant bit processing section and a least significant bit processing section. The transmitter further includes at least one termination resistor connected to respective outputs of the processing sections to provide a transmitter output. Each of the processing sections include a set of retiming latches arranged in a parallel for aligning input parallel data and providing parallel aligned latched outputs responsive to one phase of a quarter-rate four-phase quadrature clock. Each of the processing sections further includes a serializer for serializing the parallel aligned latched outputs to provide a serialized output using quarter-rates of the quarter-rate four-phase quadrature clock. Each of the processing sections also include an output driver for driving the serialized output.

Abstract: In a self-synchronous transmission scheme, received data is accurately acquired. A timing signal generating unit generates timing signals indicating different timings in synchronization with a timing at which a status of a reception signal transitions. A first data signal generating unit generates a first data signal from statuses of the reception signal before and after a timing at which a predetermined first timing signal becomes a specific value, and outputs the first data signal in synchronization with a second timing signal different from the first timing signal. A second data signal generating unit generates a second data signal from statuses of the reception signal before and after a timing at which the second timing signal becomes the specific value, and outputs the second data signal in synchronization with a timing signal different from the first timing signal.

Abstract: A method of operating a transmission device in a wireless communication system includes: determining a reception state of a reception device; and performing beamforming based on the reception state.

Abstract: A frequency estimation apparatus and method for a single receiver. The frequency estimation apparatus for the single receiver includes: a coarse frequency estimation unit estimating a coarse frequency by calculating an average of frequency estimation values for each single pulse; a direct current domain transformation unit transforming a reception signal into a direct current domain based on the coarse frequency; a fine frequency estimation unit estimating a fine frequency by applying regression analysis to a pulse train in the direct current domain of the coarse frequency; and an extremely fine frequency estimation unit estimating an extremely fine frequency by compensating an error of the coarse frequency with the fine frequency.