Abstract: A receiver includes a plurality of equalization modules each configurable to provide a selectable compensation value to a data bit stream received by the receiver, and a control module configured to perform a plurality of back channel adaptations on the data bitstream to achieve a target bit error rate for the receiver, each back channel adaptation being associated with a set of compensation values of the equalization modules, determine a most common set of compensation values derived from the performance of the plurality of back channel adaptations, and determine an optimized set of compensation values based on the most common set of compensation values.

Abstract: A wireless communication system includes a controller to control a plurality of antenna subarrays of a first wireless communication device to form a plurality of directional beams to communicate a beamformed diversity wireless transmission between the first wireless communication device and a set of second wireless communication devices over a plurality of communication channels. The controller assigns at least some antenna subarrays to at least some second wireless communication devices using a greedy optimization with a relaxation parameter and controls the plurality of antenna subarrays according to the assignment.

Abstract: A frequency converter control unit has: a serial control unit interface, a control unit clock pulse generator for generating a control unit clock pulse, and a control unit processor which is designed to define a control parameter depending on an actual value. A power unit has a data connection to the control unit and has several power semiconductors, a power unit clock pulse generator for generating an adjustable power unit clock pulse, a serial power unit interface, a clock pulse generator adjustment unit which has a signal connection to the power unit interface and which adjusts the power unit clock pulse depending on signals received by the power unit on the power unit interface, a power unit processor which controls the power semiconductors depending on the control parameter and the power unit clock pulse, and a sensor unit that determines the actual value. The control unit transmits the control parameter via the control unit interface to the power unit.

Abstract: A transceiver that allows dynamic high-pass filter (HPF) cut-off frequency adjustment may include a mixer circuit to mix a local oscillator (LO) signal with a receive (RX) signal received from a transmitter to generate a baseband signal. The transceiver may further include a high-pass filter (HPF) having an adjustable cut-off frequency that is used to reduce a DC offset of the baseband signal. A control circuit can dynamically control components of the HPF to set the adjustable cut-off frequency at a first frequency during a first time period and at a second frequency during a second time period.

Abstract: A receiver architecture and method recovers data received over an optical fiber channel in the presence of cycle slips. In a first cycle slip recovery architecture, a receiver detects and corrects cycle slips based on pilot symbols inserted in the transmitted data. In a second cycle slip recovery architecture, a coarse cycle slip detection is performed based on pilot symbols and a cycle slip position estimation is then performed based on carrier phase noise. The receiver compensates for cycle slips based on the position estimation.

Abstract: A device with an I/O interface includes a replica clock distribution path matched to a clock distribution path of an unmatched receiver circuit. The device can monitor changes in delay in the replica path, and adjust delay in the real clock distribution path in response to the delay changes detected in the replica path. The receiver circuit includes a data path and a clock distribution network in an unmatched configuration. A ring oscillator circuit includes a replica clock distribution network matched to the real clock distribution network. Thus, delay changes detected for the replica clock distribution network indicates a change in delay in the real clock distribution network, which can be compensated accordingly.

Abstract: The present disclosure relates to a radio receiver, a radio transmitter, and methods for evaluating receive and transmit antenna patterns of directive payload antennas. The method for evaluating receive antenna patterns of a directive payload antenna comprises the step of steering a probing signal receive pattern of a steerable receive pattern antenna according to a pre-determined sequence of probing signal receive patterns, and receiving a probing signal via the steerable receive pattern antenna, as well as determining a probing signal quality value from the received probing signal as a function of the pre-determined sequence of probing signal receive patterns.

Abstract: A building automation system includes a host device and a plurality of client devices that can communicate with the host device via a frequency hopping protocol. The host device is configured to create and/or store a frequency hopping sequence including a plurality of ordered predetermined frequencies, and listens for communications from the plurality of client devices. Each cycle through the frequency hopping sequence is considered to be a channel. The host device may define a plurality of channels, with some of the plurality of channels reserved for routine messaging between the host device and the plurality of client devices and some of the plurality of channels reserved at times for higher bandwidth data communications.

Abstract: A transmission apparatus that (i) generates a Quadrature Phase Shift Keying (QPSK) modulation signal s1 (t) by applying a QPSK modulation scheme to a first data sequence, (ii) generates a 16-Quadrature Amplitude Modulation (QAM) modulation signal s2(t) by applying a 16-QAM modulation scheme to a second data sequence, (iii) generates a transmission signal z1(t) and a second transmission signal z2 (t) by applying a phase hopping process, a precoding process, and a power adjust process to the QPSK modulation signal s1(t) and the 16-QAM modulation signal s2(t), wherein an average transmission power of the 16-QAM modulation signal s2(t) being the same as an average transmission power of the QPSK modulation signal s1(t), and (iv) transmits the transmission signal z1(t) from a first antenna at a first time and a first frequency and the second transmission signal z2(t) from a second antenna at the first time and the first frequency.

Abstract: To suppress an unstable operation of a device caused by filtering, an output selection unit is configured to acquire an unfiltered value representing an input signal (signal before filtering) stored in an input holding unit, a filtered value representing a signal acquired by filtering the input signal by a filtering unit, and a previous output value representing an output signal output at a previous time, select a middle value out of the filtered value, the unfiltered value, and the previous output value, and set the selected middle value as a current output value of an output signal.

Abstract: High-data rate channel interface modules and equalization methods employing a finite impulse response (FIR) analog receive filter. Embodiments include an illustrative channel interface module having multiple amplifier-based delay units arranged in a sequential chain to convert an analog input signal into a set of increasingly-delayed analog signals that are weighted and combined together with the analog input signal to form an equalized signal; and a symbol decision element operating on the equalized signal to obtain a sequence of symbol decisions. An interface that extracts received data from the sequence of symbol decisions. The delay units may employ one or more delay cells each having a common-source amplifier stage followed by a source follower output stage, the two stages providing approximately equal portions of the propagation delay. An enhanced gate-to-drain capacitance in the common-source amplifier may increase propagation delay while reducing bandwidth limitations.

Abstract: An active antenna associated device and system, and a transmitting and receiving calibration method, used for implementing extensible design of an antenna array, reducing construction implementation difficulty, and ensuring construction implementation reliability. The active antenna unit comprises: N active antenna arrays, a main calibration coupling circuit unit, a transmitting and receiving calibrating unit, a calibration parameter storage unit, and a radio over fiber (ROF) photoelectric conversion unit, wherein N is larger than 1. Each active antenna array at least comprises an antenna calibration coupling circuit unit and M antenna oscillators connected to the antenna calibration coupling circuit unit, wherein M is larger than 1. The antenna calibration coupling circuit units of the active antenna arrays are connected to the main calibration coupling circuit unit through a calibration radio frequency channel.

Abstract: In a method of transmitting data between a transmitter and a receiver via two pairs of wires in a differential mode, the method comprises transmitting, from the transmitter to the receiver, related signals onto the two pairs of wires in respect of each tone in a first subset of tones and processing the received signals in dependence upon estimated channel transfer functions associated with both direct and crosstalk channels. The method further comprises transmitting, from the transmitter to the receiver, unrelated signals onto the two pairs of wires for each tone in a second subset of the tones, the unrelated signals being vector precoded before transmission and wherein a cut-off frequency and/or tone demarcates between the first and the second subsets of tones.

Abstract: A radio base station, user equipment (UE), and method of control signaling in wireless communication systems. Control information is transferred from a base station to at least one UE, via a plurality of common pilot channels. A set of unique pilot sequences is predefined, and the base station assigns specific pilot sequences from the set of pilot sequences to specific common pilot channels, forming a pilot sequence assignment pattern representing specific control information. The UE, having knowledge of the relations between pilot sequence assignment patterns and control information, interprets the received pilot sequence assignment pattern as specific control information. The method is particularly well suited for broadcast type control information.

Abstract: A digital signal processing, DSP, unit (10) for use in a coherent optical receiver for an optical communications network. The DSP unit comprises an adaptive equalizer (12) and a processing block (22). The equalizer (12) comprises input ports for receiving electrical signals, each corresponding to a different state of polarization of an optical signal received by the coherent optical receiver, and output ports, each connected to a processing branch (14). A processing branch comprises a symbol sequence estimator, SSE, (16) and a carrier phase estimator, CPE, (18) comprising an input for receiving signal taped from an output of the processing branch. An output of the CPE is connected to a phase adjuster (20) interconnecting the respective output port of the equalizer and the SSE. The processing block (22) is connected to an output of the CPE, an output of the processing branch and at least one of the output of the phase adjuster and the outputs of the equalizer.

Abstract: Systems and methods are provided for band-limited digital pre-distortion (DPD) expansion estimation and curve adjustment. Pre-distortion adjustments may be applied during processing of an input signal, and expansion introduced as result of applying the pre-distortion adjustments may then be estimated. Expansion adjustments may then be determined based on the estimated expansion, and the expansion adjustments may be applied in a feedback manner during subsequent processing operations.

Abstract: A method employed by a circuit included within a receiver apparatus and configured for performing IQ mismatch compensation when receiver apparatus is operating under data reception mode includes: transforming a data signal, which is generated by a radio frequency receiver under the data reception mode, from time domain into a plurality of frequency bin signals in frequency domain; calculating to obtain at least one frequency domain calibration parameter according to the plurality of frequency bin signals in frequency domain; and, updating at least one coefficient parameter of IQ mismatch compensation according to the obtained at least one frequency domain calibration parameter, to make IQ mismatch compensation compensate IQ mismatch based on the updated at least one coefficient parameter.

Abstract: Scalable telecommunications systems and methods are provided. In one embodiment, a node unit for a scalable telecommunications system comprises: a plurality of universal digital RF transceivers each configured to communicatively couple the node unit to external equipment; one or more universal digital transport interfaces each configured to communicatively couple the node unit to a respective transport link; a universal backplane communicatively coupled to the universal digital RF transceivers and universal digital transport interfaces; and a system controller; wherein each of the universal digital RF transceivers is configured to couple to a respective modular power amplifier and a modular duplexer inserted within the node unit.

Abstract: A method for transmitting a frame is provided by a device in a wireless communication network. The device compensates a carrier frequency using a value of carrier frequency offset (CFO), and transmits a frame with the compensated carrier frequency to a receiver. The value of the CFO is indicated in TXVECTOR. A method for transmitting a frame is provided by a device in a wireless communication network. The device allocates data tones for a last symbol based on a payload size, generates the last symbol having repeated waveforms and transmits a frame including at least one period waveform of the repeated waveforms in the last symbol.

Abstract: Some embodiments include apparatus and methods using an input node, an analog to digital converter (ADC) including an input coupled to the input node, a first feedforward equalizer (FFE) including an input coupled to an output of the ADC, a second FFE including an input coupled to the output of the ADC, and a decision feedback equalizer (DFE) including a first input, a second input, and an output, the first input coupled to an output of the first FFE, and the second input coupled to an output of the second FFE.