Abstract: A method by a network node in a communications system includes determining a codebook subset restriction indicating a reduced set of precoding matrices out of an original set of precoding matrices in an original codebook. The full set of Precoding Matrix Indicator, PMI, bits is used to identify the original set of precoding matrices in the original codebook. The method includes determining a reduced set of Precoding Matrix Indicator, PMI, bits for use in a feedback channel based on a number of entries in the reduced set of precoding matrices. The reduced set of PMI bits has fewer bits than the full set of PMI bits. Related user equipments, methods by user equipments and network nodes are disclosed.

Abstract: A user apparatus for use in a radio communication system, including: an interference reduction process unit configured to reduce, from a received signal received by the user apparatus, an interference signal that becomes interference to a desired signal so as to obtain the desired signal; an interference reduction process execution determination unit configured to measure reception quality of the interference signal, and to determine whether to regard the interference signal as a target of interference reduction processing based on the reception quality, wherein the interference reduction process execution determination unit determines whether to regard the interference signal as the target of interference reduction processing by comparing a first indicator value of the interference signal that is estimated from the reception quality with a second indicator value that is used for transmission of the interference signal.

Abstract: A communication system has a trunk extending from a network facility, such as a central office, with a plurality of distribution points positioned along the trunk. Each leg of the trunk defines a shared channel that permits peak data rates much greater than what would be achievable without channel sharing. As an example, the connections of each respective trunk leg may be bonded. Further, the same modulation format and crosstalk vectoring are used for each leg of the trunk. The crosstalk vectoring cancels both far-end crosstalk (FEXT) that couples between connections of a given trunk leg and crossover crosstalk that couples between one trunk leg and another. In addition, logic determines an amount of excess capacity available for each leg of the trunk and controls error correction based on the determined excess capacity.

Abstract: Systems and techniques relating to repeated signal detection are described. A described technique includes receiving a signal including a first portion and a second portion, the first portion including a first received symbol and a second received symbol; detecting whether the first received symbol is repeated as the second received symbol using a maximum a posterior decision metric including a first component and a second component, the first component contributing to the decision metric in accordance with the first received symbol being repeated as the second received symbol, and the second component contributing to the decision metric in accordance with the first received symbol not being repeated as the second received symbol; determining a format based on whether or not the first received symbol was repeated; and processing the second portion of the signal in accordance with the format, as determined.

Abstract: A control method for a decision feedback equalizer (DFE) includes: generating a channel impulse response (CIR) estimation vector according to an input signal at a CIR estimation frequency; generating an FFE coefficient according to the CIR estimation vector at a first frequency; generating an FBE coefficient according to the CIR estimation vector, and the FFE coefficient at a second frequency; generating a feed-forward equalization filtered result according to the input signal and the FFE coefficient; generating a feed-backward equalization filtered result according to a decision signal and the FBE coefficient; and generating an updated decision signal according to the feed-forward equalization filtered result and the feed-backward equalization filtered result. At least one of the first frequency and the second frequency is smaller than the CIR estimation frequency.

Abstract: A user apparatus for use in a radio communication system, including: an successive interference cancelling reception unit configured to obtain a desired signal by successively canceling an interference signal that becomes interference to the desired signal from a received signal that the user apparatus receives; and an ordering determination unit configured to determine an order of interference signals to be successively canceled by the successive interference cancelling reception unit, wherein the ordering determination unit determines the order based on reception quality for each interference signal.

Abstract: Embodiments of a master station and method for high-efficiency Wi-Fi (HEW) communication using a multi-device HEW preamble are generally described herein. In some embodiments, the master station may select a number of long-training fields (LTFs) to be included in the multi-device HEW preamble of an HEW frame. The HEW frame may comprise a plurality of links for transmission of a plurality of streams. The master station may transmit the selected number of LTFs sequentially as part of the HEW preamble and transmit a plurality of data fields to scheduled stations during an HEW control period. Each data field may correspond to one of the links and may comprise one or more streams. The selection of the number of LTFs to be included in the HEW preamble may be based on a maximum number of streams to be transmitted on a single link.

Abstract: A MIMO network system and an interference eliminating method thereof are provided. MIMO network system includes a first mobile station and a base station. The base station has a plurality of antennas which are used for transmitting data to the first mobile station and receiving data from a second mobile station at the same time. The first mobile station determines an interference quality value according to a signal from the second mobile station and transmits the interference quality value to the base station. The base station determines a first receiving performance of the first mobile station according to the interference quality value and adjusts an antenna setting of the antennas according to the first receiving performance.

Abstract: A method for associating signal sources and paths includes determining secondary paths of a signal received at a reception point, wherein the signal reflects off one or more reflective surfaces before being received at the reception point, determining mirror sources of the secondary paths in accordance with locations of the one or more reflective surfaces and a main source of the signal, determining associations between the secondary paths and the mirror sources based on cross points at which the signal reflected off the one or more reflective surfaces, thereby obtaining path-source associations, and instructing use of the path-source associations in multi-source channel estimation.

Abstract: Embodiments of the present invention relate to a method and an apparatus for processing signal interference, including: splitting a first self-interference signal into at least two same sub self-interference signals, adjusting amplitudes and phases of the sub self-interference signals to obtain adjusted sub-signals, superposing the adjusted sub-signals and received signals, to obtain superposed sub-signals, filtering the superposed sub-signals by using filters of corresponding channels, to obtain wanted sub-signals, and merging each of the wanted sub-signals to obtain a complete wanted signal. Because received signals are separately filtered by using n different channels, it can be implemented that a self-interference signal can be effectively filtered out on each frequency band.

Abstract: A wireless communication method between a plurality of end-points by a plurality of base stations, based on frames that have a CSS-modulated preamble followed by a data body modulated at a narrower bandwidth, either by CSS or by a UNB modulation. The system permit to avoid or mitigate collision between packets and to increase the network capacity, maintaining the simplicity of detection inherent of CSS modulation.

Abstract: A transceiver arrangement (200) for a fixed point-to-point radio link. The transceiver arrangement (200) comprising a transceiver (215) connected to a first antenna (210) and to a second antenna (220). The transceiver (215) being arranged to transmit a first transmit signal (211) via the first antenna (210) in a first frequency band (f1), the transceiver (215) also being arranged to receive a first receive signal (212) via the first antenna (210) in a second frequency band (f2), the transceiver (215) further being arranged to transmit a second transmit signal (221) via the second antenna (220) in the second frequency band (f2), the transceiver (215) also being arranged to receive a second receive signal (222) via the second antenna (220) in the first frequency band (f1).

Abstract: For small cells, transceivers demand high performance while maintaining system efficiency. The present disclosure describes a highly integrated cellular transceiver that offers such features by providing one or more digital functions on-chip, onto the same die in the cellular transceiver. Effectively, the scope and boundary of the cellular transceiver is expanded to move beyond the data converters of the transceiver to include a variety of digital functions, thus integrating more of the signal chain in the cellular transceiver. Integration can greatly reduce complexity for the baseband processing, lower the cost of the overall transceiver system, reduce power consumption, and at the same time, benefit from improvements on the digital functions through integration.

Abstract: A clock generation circuit may include a reference clock generator configured to generate a pair of first reference clocks in an offset code generation mode, a triggering unit configured to generate a pair of second reference clocks from the pair of first reference clocks, a pulse detector configured to generate a duty detection signal based on a phase difference between the pair of second reference clocks, a correction code generator configured to generate a reference correction code based on the duty detection signal, and an offset code generator configured to generate an offset code based on the reference correction code and a preset reference code.

Abstract: A cable modem termination system (CMTS) may communicate with a plurality of cable modems using a plurality of orthogonal frequency division multiplexed (OFDM) subcarriers. The CMTS may determine a performance metric of each of the cable modems. For each of the OFDM subcarriers and each of the cable modems, the CMTS may select physical layer parameters to be used for communication with that cable modem on that OFDM subcarrier based on a performance metric of that cable modem. The parameters may be selected for each individual modem and/or each individual subcarrier, or may be selected for groups of modems and/or groups of subcarriers. The parameters may include, for example, one or more of: transmit power, receive sensitivity, timeslot duration, modulation type, modulation order, forward error correction (FEC) type, and FEC code rate.

Abstract: A receiver applies a calibration method to compensate for skew between input channels. The receiver skew is estimated by observing the coefficients of an adaptive equalizer which adjusts the coefficients based on time-varying properties of the multi-channel input signal. The receiver skew is compensated by programming the phase of the sampling clocks for the different channels. Furthermore, during real-time operation of the receiver, channel diagnostics is performed to automatically estimate differential group delay and/or other channel characteristics based on the equalizer coefficients using a frequency averaging or polarization averaging approach. Framer information can furthermore be utilized to estimate differential group delay that is an integer multiple of the symbol rate. Additionally, a DSP reset may be performed when substantial signal degradation is detected based on the channel diagnostics information.

Abstract: A method and an apparatus for receiving broadcast signals thereof are disclosed. The apparatus for receiving broadcast signals, the apparatus comprises a receiver to receive the broadcast signals, a demodulator to demodulate the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplex) scheme, a frame parser to parse a signal frame from the demodulated broadcast signals, a decoder to decode data in the parsed signal frame and an output-processor to output-process the decoded data.

Abstract: A communication system includes a transmitter, a first transmission line, and a second transmission line. The transmitter includes a modulation circuit, a carrier generator, and a pulse generator. The modulation circuit is configured to modulate a first data stream based on a first carrier signal, thereby generating a modulated signal. The carrier generator is configured to generate the first carrier signal and a reference clock signal. The pulse generator is configured to generate a pulse train signal based on the reference clock signal. The first transmission line is configured to carry the modulated signal. The second transmission line is configured to carry the pulse train signal.

Abstract: Embodiments of the present invention provide a method for signal compensation, including: receiving, by a receiver via N receiving antennas, a plurality of channel estimation preamble signals sent by M transmitting antennas of a remote transmitter; determining, by the receiver, channel estimation parameters according to the first pilot signals of the M transmitting antennas contained in the plurality of channel estimation preamble signals; receiving, by the receiver, data signals and second pilot signals sent on a first data symbol by the M transmitting antennas; determining, by the receiver, channel phase shift parameters according to signals arrived at the N receiving antennas which come from the second pilot signals; and determining, by the receiver according to the channel estimation parameters and the channel phase shift parameters, signal compensation for the data signals arrived at the N receiving antennas. Accuracy of demodulation for transmitted data to a certain extent is improved.

Abstract: A spintronic wireless communication system for simultaneously modulating multiband frequencies and amplitudes includes a plurality of spin-torque transfer devices which have different frequency characteristics from each other, and OOK modulate or multi-level ASK modulate input data to thereby output a multiband OOK modulation signal or a multiband, multi-level ASK modulation signal; a plurality of matching networks which match individual impedances of the plurality of spin-torque transfer devices; and a broadband antenna which receives the multiband OOK modulation signal or the multiband, multi-level ASK modulation signal from ends of the plurality of matching networks and simultaneously transmits the signals to the outside.