Abstract: A system for phased array signal beam tracking includes a phased array transmitter configurable for transmitting a signal beam at a selected transmit beam angle from a plurality of different transmit beam angles. The system also includes a beam gain angle coding assembly configured for modulation of a gain of the signal beam to produce a resulting gain profile of the signal beam. The resulting gain profile includes offset angle coding that indicates an offset incident angle of the signal beam at a receiving antenna.

Abstract: A low cost millimeter wave receiver and method for operating same is disclosed. In one embodiment, the method comprises receiving the first signal, converting the first signal of the first bandwidth into an intermediate frequency band, splitting the converted first signal into N of intermediate signals, each having a bandwidth less than the digital processor bandwidth, wherein N is an integer greater than one, downconverting each of the N intermediate signals to the second frequency band, processing the downconverted plurality of signals with the digital processor to generate N processed signals, upconverting each of the N processed signals to the intermediate frequency band, converting the upconverted signals to the third frequency band, and transmitting the converted signals.

Abstract: An apparatus for transmitting broadcast signals includes an encoder to encode service data, a mapper to map the encoded service data, and a time interleaver to interleave the mapped service data. The time interleaver includes a cell interleaver to interleave cells in a FEC block of the mapped service data, where the cell interleaver performs linearly writing the cells in the FEC block into a memory and randomly reading the cells in the FEC block according to a permutation sequence. The permutation sequence varies in every FEC block by using a shift value. The apparatus also includes a block interleaver to interleave the cell interleaved service data, where the block interleaver includes column-wise writing FEC blocks of the cell interleaved service data into a TI memory, and diagonal-wise reading the FEC blocks from the TI memory by skipping a part of cells included in the TI memory, and a convolutional interleaver to interleave the block interleaved service data.

Abstract: The present patent application relates to a transmission method and corresponding receiving methods. The transmission method comprises: selecting K number of data streams for transmission, wherein each data stream comprises one or more data messages; and independently for each data stream k=0, . . . , K?1: encoding and modulating data messages of the kth data stream using a Trellis Coded Modulation, TCM, scheme TCMk, interleaving the encoded and modulated data messages of the k-th data stream by using a stream specific interleaver ?k, scrambling the interleaved data messages of the k-th data stream by using a stream specific scrambling sequence; combining all scrambled data messages of the K number of data streams into at least one transmission signal s(l); and transmitting the at least one transmission signal s(l) over a radio channel of the wireless communication system.

Abstract: Systems and methods disclosed herein provide for effectively eliminating the rotational and static phase skews between the in-phase (I) and quadrature (Q) clocks generated by phase interpolators in decision feedback equalizer based receivers. Embodiments of the systems and methods provide for (i) a ring oscillator that eliminates the rotational phase skews and (ii) a plurality of clock mixers that eliminate the static phase skews.

Abstract: A simultaneous information and energy transfer method and system with a guard interval signal are provided. The method comprises the steps of generating, by a transmitting terminal, a controllable guard interval signal according to the current energy demand and environment conditions for channel transmission. The system comprises a transmitting terminal configured to generate a controllable guard interval signal. In the system and method, the guard interval time is fully utilized to transfer a guard interval signal with controllable amount of energy, which not only prevents intersymbol interference, but also provides controllable energy signals within the guard interval time at the same time, thus improving the energy transfer performance of the system and reducing the probability that the receiving terminal is unable to operate normally due to energy shortage. The present invention can be widely applied to a variety of simultaneous wireless information and energy transfer systems.

Abstract: A driver circuit includes a first inverter, a bias-control circuit, and a second inverter. The first inverter, which is connected between a first supply voltage and ground, receives an input data signal and generates an inverted version of the input data signal. The bias-control circuit, which is connected between a second supply voltage and the first inverter, receives the inverted version of the input data signal and a bias signal, and generates a level-shifted data signal based on the inverted version of the input data signal, the bias signal, and the second supply voltage. The bias-control circuit reduces a difference between voltage levels of the second supply voltage and the inverted version of the input data signal. The second inverter is connected between the second supply voltage and ground, and further connected to the bias-control circuit and first inverter and generates an output data signal.

Abstract: A receiver circuit includes a conversion circuit configured to down-convert a received radio-frequency signal to a baseband signal, an analog-to-digital converter configured to sample the baseband signal into a sampled signal, a Fast Fourier transform (FFT) circuit configured to perform an FFT on the sampled signal, and a digital compensation circuit configured to compensate for IQ distortion in a frequency domain.

Abstract: A method is provided by which a multiple-input multiple-output (MIMO) receiver, which includes a plurality of antennas, processes received signals. The MIMO receiver determines a detection order, which is the order of processing received signals received by a plurality of layers through the plurality of antennas, by using channel information of a reference resource element (RE). The MIMO receiver generates common multi filters for processing the received signals in accordance with the detection order, generates an RE group, which includes a plurality of REs and in which the common multi filters generated on the basis of the reference RE will be shared, and generates detection signals from each received signal of the REs by applying the common multi filters to each received signal of the REs excluding the reference RE in the RE group. The RE group comprises REs having the same detection order as that of the reference RE.

Abstract: A low-power synchronizer circuit, a data processing circuit that incorporates the synchronizer circuit, and a synchronization method are provided. The synchronizer circuit includes a delay circuit for receiving and delaying an asynchronous input signal, a first flip-flop having an input terminal connected to an output terminal of the delay circuit, a clock terminal for receiving the asynchronous input signal, and a reset terminal for receiving the asynchronous input signal, a synchronizer connected to an output terminal of the first flip-flop, and a clock-gating circuit for receiving a clock signal and determining whether to supply the clock signal to the synchronizer in response to one of a first output value of the delay circuit and a second output value of the first flip-flop and a third output value of the synchronizer.

Abstract: The invention relates to a method for serial data transmission, comprising the steps consisting in computing the running disparity (RD) of a bit stream that is being transmitted; when the running disparity reaches a threshold (T), computing a point disparity on a subsequent frame (S) of the stream; if the point disparity has the same sign as the threshold, inverting the states of the bits of the frame in the transmitted bit stream; and inserting into the transmitted bit stream a polarity bit having a state signalling the inversion.

Abstract: A down-conversion circuit for a receiver circuit is disclosed, the down-conversion circuit comprises a first passive switching mixer arranged to down-convert a received radio frequency, RF, signal with a first local oscillator, LO, signal (LO1) having a first duty cycle for generating a first down-converted signal at an output port of the first passive switching mixer. The down-conversion circuit further comprises a second passive switching mixer arranged to down-convert the received RF signal with a second LO signal (LO2) having the same LO frequency as the first LO signal (LO1) and a second duty cycle, different from the first duty cycle, for generating a second down-converted signal at an output port of the second passive switching mixer.

Abstract: Hybrid intra-cell/inter-cell remote unit antenna bonding in multiple-input, multiple-output (MIMO) distributed antenna systems (DASs), and related components, systems, and methods. The MIMO DASs are capable of supporting distributed MIMO communications with client devices. To provide enhanced MIMO coverage areas, hybrid intra-cell/inter-cell remote unit antenna bonding is employed. For example, if a client device has acceptable MIMO communications signal quality with MIMO antennas within a single remote unit, intra-cell bonding of the MIMO antennas can be employed to provide MIMO coverage for MIMO communications, which may avoid power imbalance issues that would result with inter-cell bonded MIMO antennas. However, if a client device has acceptable MIMO communications signal quality with MIMO antennas in a separate, neighboring remote unit(s), inter-cell bonding of the MIMO antennas can be employed to provide MIMO coverage for MIMO communications.

Abstract: A direct communication network system and a signal synchronization method thereof are provided. The direct communication network system includes a first direct communication apparatus and a second direct communication apparatus. The first direct communication apparatus synchronizes with a base station within communication coverage of the base station. The second direct communication apparatus synchronizes with the first direct communication apparatus outside the communication coverage of the base station according to at least one first synchronization signal of the first direct communication apparatus. The first direct communication apparatus determines an abnormal synchronization status with the base station, and adjusts a transmitting status of the at least one first synchronization signal.

Abstract: Methods and apparatus are provided for modeling of a physical system using two-dimensional look-up tables.

Abstract: A signal processing circuit arrangement may include a preamplifier circuit configured to map a first dimension input and a second dimension input to a first subset of a plurality of lookup table coefficients of a two-dimensional (2D) lookup table, wherein the first dimension input and the second dimension input each represent a signal level of one or more input signals, extrapolate from the first subset of the plurality of lookup table coefficients to generate a lookup table output, and apply the lookup table output to the one or more input signals to generate a predistorted input signal for an amplifier.

Abstract: A networking device testing system includes a testing device that is connected to a load generator device and a networking device. The testing device includes a testing device chassis. First testing device connectors are included on the testing device chassis and are each connected to a respective networking device connectors on the networking device. Pairs of the first testing device connectors are coupled together such that traffic received through one of the first testing device connectors in each pair is directed to the other of the first testing device connectors in each pair. Second testing device connectors are included on the testing device chassis. At least one of the second testing device connectors is connected to the load generator device. Each of the second testing device connectors is coupled to a respective one of the first testing device connectors.

Abstract: A distributed antenna system (DAS) according to an aspect of the inventive concept includes a first node unit for receiving first digital data in accordance with a digital interface standard from a base station, converting the first digital data into second digital data in accordance with a DAS frame standard, and a second node unit for receiving the second digital data from the first node unit, and restoring the first digital data based on the second digital data.

Abstract: Data communication having improved electromagnetic interference (EMI) rejection when communicating through a coaxial cable is provided by using differential transmission and/or reception through a common-mode choke and a dissipative element resulting in extremely low radiated emissions and high immunity to external radiation interference in a low-cost way.

Abstract: The invention relates to a method for serial data transmission, comprising the steps consisting in computing the running disparity (RD) of a bit stream that is being transmitted; when the running disparity reaches a threshold (T), computing a point disparity on a subsequent frame (S) of the stream; if the point disparity has the same sign as the threshold, inverting the states of the bits of the frame in the transmitted bit stream; and inserting into the transmitted bit stream a polarity bit having a state signalling the inversion.