Abstract: An output of a transmitter is looped back to an input of a receiver during a first time period while applying a frequency offset between the transmitter and the receiver. A first imbalance between an in-phase (I) branch and a quadrature-phase (Q) branch in the receiver is determined based on a signal received at the receiver during the first time period. The receiver is calibrated based on the determined first imbalance. After calibrating the receiver, the output of the transmitter is looped back to the input of the receiver during a second time period during which the frequency offset is not applied. A second imbalance between an I branch in and a Q branch in the transmitter is determined based on a signal received at the receiver during the second time period while the frequency offset is not applied. The transmitter is calibrated based on the determined second imbalance.

Abstract: A 1/n-rate decision feedback equalizer (DFE) and method include a plurality of branches. Each branch includes a separate summer circuit configured to add a respective feedback signal to a received input and a latch configured to receive an output of the summer circuit to provide different partial bit sequences based on a clock signal. A feedback circuit includes a multiplexer configured to multiplex the different partial bit sequences of each branch to assemble a full rate bit sequence and a filter configured to provide cancellation of intersymbol interference (ISI) from the received input.

Abstract: Embodiments of the present invention provide a method for feeding back channel state information, a user equipment, and a base station, to improve feedback precision of channel state information. The method includes: receiving a reference signal sent by a base station; selecting a precoding matrix W from a codebook according to the reference signal, where a column vector of the precoding matrix W may be expressed as ?[v ej?v]T, v=[1 ej?]; and sending a precoding matrix indicator PMI to the base station, where the PMI is corresponding to the selected precoding matrix W. The present invention may further improve quantization precision and achieve balance between overheads and the quantization precision. The base station performs precoding on a sent signal according to a fed back precoding matrix indicator, which can improve precoding precision, thereby improving a data transmission rate and system throughput.

Abstract: Techniques relating to generating and receiving radio frames with multiple partitions are disclosed. A mobile device may include a wireless radio, one or more antennas, and one or more processors. In some embodiments, the mobile device is configured to receive a frame of wireless data that includes a plurality of partitions and partition data. In some embodiments, the plurality of partitions each include multiple orthogonal frequency-division multiplexing (OFDM) symbols, and different ones of the partitions have different frequency transform sizes (e.g., different FFT sizes). In some embodiments, the partition data indicates the frequency transform sizes for the ones of the partitions. In some embodiments, the mobile device is configured to select, based on the partition data, one or more of the plurality of partitions and decode the selected one or more partitions to determine data represented by the OFDM symbols in the selected one or more partitions.

Abstract: Described herein is a feed forward equalizer that is configured to operate in a normal operational mode and in a test operational mode. The feed forward equalizer has an input port and an output port which are used for the normal operational mode. A test input port and a test output port are provided in the feed forward equalizer, and are used for the test operational mode. Buffers may be provided for matching the impedance of respective ones of the input, output, test input, and test output ports. The feed forward equalizer allows testing during development, and once mounted in an integrated circuit, without interfering with the normal operational mode.

Abstract: A transmitter's operation is characterized using components having relatively low cost and low complexity. A device includes comparator(s) that compare a transmitter's analog output to predetermined level(s) to generate count(s) associated with analog output range bin(s). Each of the predetermined levels is associated with a corresponding one of the analog output range bins. A transfer function of the transmitter is generated using the comparison count values associated with the analog output range bin(s). A histogram may be generated from the comparison count values associated with the various analog output range bins. An equalizer is implemented to process data that will be transmitted by the transmitter. The equalizer uses equalizer parameter(s) that are selected based on the characterization of the transmitter (e.g., its transfer function, its histogram, etc.). The equalizer may use default or start up parameters until the transmitter's operation is characterized.

Abstract: Embodiments of the invention provide a method to detect DSSS preambles in smart utility networks. A DSSS signal is received by a receiver and a digital sequence of samples is formed. A difference value is calculated between pairs of samples in the digital sequence of samples to form a sequence of differential values. A known preamble differential value sequence is correlated with the sequence of differential values to form a sequence of correlation values. A location of the preamble is located in the digital sequence of samples corresponding to a peak in the sequence of correlation values that exceeds a threshold value.

Abstract: The present invention relates to an amplifier circuit, comprising: first to fourth semiconductor amplifiers for controlling first to fourth currents between supply and output terminals, a first input terminal connected to provide a first input signal to a first control terminal of the first semiconductor amplifier and to a fourth control terminal of the fourth semiconductor amplifier, and a second input terminal connected to provide a second input signal to a second control terminal of the second semiconductor amplifier and to a third control terminal of the third semiconductor amplifier. The present invention also relates to a bi-stage amplifier circuit, and to a multi-stage amplifier circuit comprising a cascade of a number of amplifier circuits complying to the present invention, the multi-stage amplifier circuit having a gain control logic prepared to control a gain of at least one of the amplifier circuits.

Abstract: The present inventions are related to systems and methods for data processing, and more particularly to systems and methods for detecting patterns in a data stream. As an example, a data processing system is discussed that includes a sync mark detection circuit and a sync quality output circuit. The sync mark detection circuit is operable to identify a predefined pattern in a received data set, where identification of the predefined pattern results is asserting a sync found output, and where a preamble pattern precedes the predefined pattern in the received data set. The sync quality output circuit is operable to provide a sync mark quality metric indicating a similarity between the preamble pattern and the received data set within a region preceding the predefined pattern.

Abstract: Residual FEXT resulting from intended and/or inherent partial cancellation of crosstalk in vectored DSL systems impairs upstream power back-off (UPBO) as traditionally implemented. By considering and taking into account the effects of residual crosstalk on vectored DSL system performance and operation, improved data rates and/or other vectored DSL system performance are realized through the use of UPBO parameters generated for a given residual FEXT environment.

Abstract: A communication unit includes at least one divider module arranged to receive a radio frequency (RF) signal and output a divided representation of the RF signal, and a plurality of sliced RF modules. Each of the plurality of sliced RF modules includes: an input for receiving a clock signal; a timing synchronization module arranged to receive the divided representation of the RF signal and synchronize the divided representation of the RF signal to the clock signal, across the plurality of sliced RF modules; and at least one logic module operably coupled to the timing synchronization module and arranged to receive the clock signal and a synchronized output from the timing synchronization module. A combiner port is arranged to couple a number of synchronized outputs from the plurality of sliced RF modules.

Abstract: The present disclosure provides apparatus and methods for dynamic analog tuning for power reduction. As disclosed herein, the analog controls on a high-speed serial communication channel are dynamically adjusted in a manner so as to either reduce the total system power or move power dissipation between the transmitter and receiver devices, with little or no negative effect to the bit error rate. One embodiment relates to a method for tuning a communication link. The method includes occasionally determining whether the bit error rate for the communication link is acceptably low. Control parameters for analog circuitry of the communication link are adjusted to decrease power used if the bit error rate is acceptably low and are adjusted to increase power used if the bit error rate is not acceptably low. Other embodiments, aspects and features are also disclosed.

Abstract: Method (500) in a user equipment (110) for setting a length of a discontinuous reception cycle of the user equipment (110), which is served by a serving network node (120) in a wireless communication network (100). The method (500) comprises acquiring (501) information related to a property of a signal received from the serving network node (120). Also, the method (500) comprises setting (502) the length of the discontinuous reception cycle of the user equipment (110), based on the acquired (501) information.

Abstract: A method and apparatus are disclosed for channel estimation in broadband wireless communication systems by using locally prevailing SINR conditions in the RF channel bandwidth. According to one aspect, the channel estimation method adapts to the local SINR across different parts of the channel bandwidth. This leads to channel estimates that are optimized to SINR conditions prevailing in different parts of the channel bandwidth. The channel estimation method described herein may result in the reduction of channel estimation errors, which in turn may lead to improved performance of a broadband wireless communication system.

Abstract: A modulation coding scheme (MCS) is selected from i) a first set of MCSs when the selected channel bandwidth is a first channel bandwidth, or ii) a second set of MCSs when the selected channel bandwidth is a second channel bandwidth, wherein the first set of MCSs is different than the second set of MCSs, and the second set of MCSs excludes MCSs from the first set of MCSs that will result in a padding-related constraint not being met when the second channel bandwidth is to be used. Information bits are interleaved, which includes applying a frequency rotation. The information bits are modulated according to the selected MCS. A plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols are generated using the modulated information bits.

Abstract: Various exemplary embodiments relate to a method of producing adaptive thresholds in a binary frame based communication system, including: collecting Kst samples of a received signal corresponding to a start bit; computing an estimate of as received signal parameter Pst in the start bit; adjusting an start threshold based upon Pst; collecting Ksp samples of the received signal corresponding to a stop bit; computing an estimate of a received signal parameter Psp in the stop bit; and adjusting an stop threshold based upon Psp.

Abstract: The present disclosure provides a performance enhancement method for a multi-user multiple input multiple output (MIMO) system. The performance enhancement method includes determining whether a connection node of a data stream matches when a transmission packet is waiting for transmission in the data stream, wherein the data stream is dedicated to serving a wireless subscriber, collecting a plurality of radio-frequency parameters and MIMO information when the connection node matches, using a time-division multiple access (TDMA) mechanism to divide the transmission packet into a plurality of sub-packets, applying Space-time block code (STBC) to the sub-packets, and transmitting the encoded sub-packets in one data stream in different time instants.

Abstract: The subject matter discloses an apparatus residing within an RF chip, comprising: a detection unit for detecting IQ mismatch in an IQ signal; an analog calibration module comprising a first analog calibration mechanism for calibrating IQ mismatch in the phase component and a second analog calibration mechanism for calibrating IQ mismatch in the amplitude component; and a control unit for determining a calibration sequence of the IQ signal.

Abstract: A frequency tracking loop receives a result from a phase detector that detects an advance and a retard of a phase between input data and an extracted clock signal, and conducts a control to reduce a frequency deviation between the input data and the extracted clock signal. A phase interpolator adjusts a phase of the clock signal subjected to spread-spectrum frequency modulation on the basis result of the frequency deviation in the frequency tracking loop, and outputs the extracted clock signal. In the frequency tracking loop, the frequency deviation between the data signal and the clock signal is corrected to offset a variation of the frequency of the clock signal, on the basis of the frequency modulation information related to the clock signal subjected to the spread-spectrum frequency modulation which is input to the phase interpolator. The frequency of the clock signal seemingly follows the frequency of the data signal.

Abstract: A method and apparatus for a method and apparatus for correlation canceller for interference mitigation with adaptive DC offset cancellation for a dual mode communication device includes detecting an active signal transmitting in one mode; configuring integrators associated with the adaptive correlation canceller into gain amplifiers; detecting DC offset utilizing the gain amplifiers and comparators; and configuring the integrators from the gain amplifiers back to integrators with the DC offset applied thereto. The active signal transmitting in one mode can be Long Term Evolution (LTE) which is adjacent to a signal in another mode.