Abstract: Methods, systems, and devices are described for wired communication. In one aspect, a method includes selecting a gain scalar based at least in part on a constellation point distance associated with a constellation mapper for a line and a tone. The method also includes applying the gain scalar to a tone data output signal of a vector processor.

Abstract: A transmitter includes a synthesis filter bank to spread a data symbol to a plurality of frequencies by encoding the data symbol on each frequency, apply a common pulse-shaping filter, and apply gains to the frequencies such that a power level of each frequency is less than a noise level of other communication signals within the spectrum. Each frequency is modulated onto a different evenly spaced subcarrier. A demodulator in a receiver converts a radio frequency input to a spread-spectrum signal in a baseband. A matched filter filters the spread-spectrum signal with a common filter having characteristics matched to the synthesis filter bank in the transmitter by filtering each frequency to generate a sequence of narrow pulses. A carrier recovery unit generates control signals responsive to the sequence of narrow pulses suitable for generating a phase-locked loop between the demodulator, the matched filter, and the carrier recovery unit.

Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder for encoding service data corresponding to each of a plurality of data transmission units, an encoder for encoding physical signaling data by a shortening scheme and a puncturing scheme, a mapper for mapping the encoded service data onto constellations, a frame builder for building at least one signal frame including preamble data, a modulator for modulating the at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme, a transmitter for transmitting the broadcast signals carrying the at least one modulated signal frame.

Abstract: Embodiments of the present invention provide a wireless communications method, user equipment, a base station and a system, and relate to the field of wireless communications. The method includes: acquiring a frequency domain spreading factor, a symbol-level spreading factor and a transmission time interval-level spreading factor; and performing frequency domain spreading, symbol-level spreading and transmission time interval-level spreading on first to-be-sent information respectively according to the acquired spreading factors and sending first spread information; or, despreading, according to the acquired spreading factors, second spread information sent by a base station.

Abstract: The estimation and mitigation of swept-tone interferers includes receiving a composite signal comprising a signal of interest and a swept-tone interferer over an observation bandwidth. The estimation of the interfering signal may be based on modeling the interferer over the observation bandwidth as a magnitude periodic signal comprising non-overlapping, contiguous epochs, where each epoch may comprise a common pulse shape and a distinct phase rotation. The period of the magnitude-periodic signal may be initially determined, and the common pulse shape and each of the distinct phase rotations may then be estimated. These estimates may be used to reconstruct an estimate of the swept-tone interferer, which may be subtracted from the composite signal to generate an interference-mitigated signal of interest.

Abstract: A sum of products calculation of a predetermined tap number of tap data and a prescribed tap number of coefficients is carried out and a sum of the predetermined number of tap data is calculated. A replica signal is calculated on the basis of the sum of products calculation result, the sum of the tap data, and a correction coefficient. A residual signal is calculated as the difference between the replica and received signals. The predetermined tap number of coefficients is updated based on the predetermined tap number of tap data and the residual signal, and the correction coefficient calculated from the residual signal. Here, the tap data is either a data symbol before the superimposition of a DC component or an estimation thereof. This allows an adaptive FIR filter used in channel estimation of a received signal by a digitally modulated wave whereupon a DC component is superimposed.

Abstract: Methods, systems, and devices are described for minimizing mutual interference between networks that implement different protocols. In one embodiment, a first network device of a first network may exchange coexistence information with a second network device of a second network to determine whether to share resources or reduce transmit power based, at least in part, on the interference detected at the first network device from a transmission of the second network device. In one embodiment, both the first and the second network devices may independently and iteratively reduce their respective transmit power to minimize interference between the interfering networks. The first network device may reduce its transmit power based on an interference of the second network device and vice versa. In another embodiment, the network device with a lower priority may minimize its transmit power to reduce interference with the network device with a higher priority.

Abstract: The invention concerns a method and device for processing UHF signals for an EPC communication. The method includes the steps of picking up UHF signals by an antenna of the device for processing UHF signals, creating an envelope signal from the UHF signals picked by the antenna in a demodulator, processing the envelope signal and decoding critical TRcal symbol and data in a logic unit of the device. Furthermore, the method includes the steps of interpreting the critical TRcal symbol and data, storing the interpreted data, encoding transmit data, modulating by encoded data in a modulator, and clocking the steps as above by a local oscillator. In the step of processing the envelope signal, the critical TRcal symbol is processed by a high frequency clock and data are processed by a low frequency clock.

Abstract: A phase detector and retimer circuit that includes a retimer circuit, a phase shift circuit coupled to the retimer circuit, and an error signal generation circuit coupled to the retimer circuit and the phase shift circuit. The retimer circuit is configured to receive a data signal and generate a first retimed data signal based on a first phase of a clock signal and a second retimed data signal based on a second phase of the clock signal. The phase shift circuit is configured to receive the data signal and phase shift the data signal to generate first, second, third, and fourth phase shifted data signals. The error signal generation circuit is configured to generate a first error signal and a second error signal based on the first and second retimed data signals and the first, second, third, and fourth phase shifted data signals.

Abstract: A transmitter includes: a transmission control circuit that determines whether or not to perform an emphasis on a data signal, based on a transition pattern of the data signal; and a transmission driver that selectively performs the emphasis based on a result of the determination by the transmission control circuit, to generate at least one transmission signal.

Abstract: An OFDM communication system performs time domain channel estimation responsive to received symbols before the symbols are processed by a fast Fourier transform. The communication system generates virtual pilots from actual pilots to improve the stability and quality of channel estimation. The system generates a reference signal from the actual and virtual pilots and correlates the resulting reference signal with a signal responsive to the received symbol to generate an initial channel impulse response (CIR) and to determine statistics about the channel. In some circumstances, the resulting reference signal is correlated with a modified symbol in which the actual and virtual pilot locations are emphasized and the data locations are deemphasized. Time domain channel estimation iteratively improves on the initial CIR. The system determines channel estimates for data only symbols through averaging such as interpolation.

Abstract: An architecture defining functional and technical perimeters to be complied with between two subsystems termed “baseband” and “radio frequency,” and to a generic physical interconnection pattern between baseband and radio frequency, which, under nominal operation, does not require physical signals specific to the design of one or other of the baseband and radio frequency subsystems, and which is not associated with a particular physical implementation solution. The architecture uses an exchange protocol which travels over the generic interface, meeting the real-time constraints of the transmission systems and using a time stamped messaging system.

Abstract: Disclosed is hybrid communication in which a first message from a guided surface wave probe node is embedded in a guided surface wave, and a second message from a guided surface wave receive node uses a different messaging mechanism.

Abstract: A super-heterodyne receiver includes a plurality of input filters configured to receive an input signal and divide up a tuning range of the input signal into a plurality of respective bands, wherein the input filters are divided into a plurality of filter sets, each having a respective filter set output, and each of the input filters has a center frequency and a bandwidth. The receiver further includes a first amplifier having an input coupled to a first filter set output and an output coupled to a first mixer; a second amplifier having an input coupled to a second filter set output and an output coupled to a second mixer. The first filter set comprises a first plurality of input filters having respective center frequencies ranging from approximately 1250 MHz to 6250 MHz, a second plurality of input filters having respective center frequencies ranging from approximately 8250 MHz to 18500 MHz, and a third plurality of center frequencies ranging from approximately 24000 MHz to 38000 MHz.

Abstract: A small, portable signal generator provides a unique marker signal modulated with a selectable number of degrees of freedom for insertion into a portion of a broadband communication system (BCS) such as a subscriber installation site that may or may not be connected to the remainder of the BCS. If payload signals are not present or brief interference with payload signals is tolerable, a high level marker signal may be injected with level control upon detection of an egress signal to detect very minor leakage sources and thus increase quality of the qualification of installation or repairs. If payload signals are present, marker signals are held to non-interfering levels and frequencies. Authentication of a signal received through an antenna is expedited and increased in confidence level by synchronization of the marker signal modulation pattern and the signal detector in a receiver.

Abstract: There is disclosed an amplifier arrangement comprising a plurality of amplifiers each arranged to amplify one of a plurality of different input signals, the arrangement comprising an envelope tracking modulator for generating a common power supply voltage for the power amplifiers, and further comprising an envelope selector adapted to receive a plurality of signals representing the envelopes of the plurality of input signals, and adapted to generate an output envelope signal representing the one of the plurality of envelopes having the highest level at a particular time instant as the input signal for the envelope tracking modulator.

Abstract: In a multi-user communication system, a pre-coder in a transmitter comprises a Discrete Fourier Transform (DFT) spreader configured to spread reference-signal symbols with Fourier coefficients to generate DFT-spread reference symbols. An OFDM modulator, such as an inverse-DFT, modulates the DFT-spread reference symbols onto OFDM subcarriers to produce a pre-coded OFDM transmission signal.

Abstract: Disclosed herein are an analog compensation circuit and a method for tuning an analog compensator in full-duplex transmission systems. An embodiment analog compensation circuit includes a secondary receiver configured to receive and convert a sampled self-interference signal to a baseband self-interference signal. A tuner is coupled to the secondary receiver and configured to receive a baseband transmit signal and the baseband self-interference signal, and to compute complex gains according to the baseband transmit signal and the baseband self-interference signal. An analog compensator is coupled to the tuner and has multiple branches. The analog compensator is configured to receive the complex gains and use them to adjust respective attenuators and phase shifters of the branches. The analog compensator is further configured to process a sample of a transmit signal using the branches, the transmit signal being up-converted from a new baseband transmit signal.

Abstract: A verification device for a LOS MIMO/SIMO system which comprises a transmitter unit connected to a first and a second transmit antenna and a first receive antenna connected to a first down-converter which outputs a first down converted signal and a second receive antenna connected to a second down-converter which outputs a second down-converted signal. The first and the second receive antennas receive a first signal with reference symbols transmitted from one of said first and second transmit antennas, and the verification device obtains the phase difference between the first signal as received in the first and the second receive antennas respectively by comparing the first down-converted signal and the second down-converted signal with the reference symbols.

Abstract: A computing system includes: an interface configured to communicate a coordination profile for coordinating a second transmitter device with a first transmitter device; and a unit, coupled to the interface, configured to generate a first encoded message using a message polarization mechanism based on the coordination profile for coordinating the first encoded message with a second encoded message concurrently transmitting through the second transmitter device. A further embodiment of the computing system includes: an interface configured to communicate a receiver signal for representing a first encoded message and a second encoded message coordinated for concurrent transmission; a unit, coupled to the interface, configured to: determine a communication rate associated with the receiver signal, and decode the receiver signal based on a message polarization mechanism and the communication rate for identifying the first encoded message based on a coordination profile corresponding to the communication rate.