Abstract: A decision-feedback equalizer for use in a receiver unit for receiving an incoming data stream and for providing a stream of bit data outputs includes a plurality of asynchronous comparators and a fastest decision detector unit operatively coupled with the asynchronous comparators. Each of the asynchronous comparators is configured to receive an input signal and to directly provide a comparison result output in an asynchronous manner. The fastest decision detector unit is configured for receiving at least a subset of the respective comparison result outputs of the asynchronous comparators and for forwarding the comparison result of one of the asynchronous comparators towards the output of the decision-feedback equalizer. The fastest decision detector unit is configured to select a given one of the asynchronous comparators as one which firstly provided its comparison result output.

Abstract: The present invention provides a method for transmitting a broadcast signal. The method for transmitting the broadcast signal according to the present invention may comprise the steps of: formatting input streams into multiple data pipes (DPs); encoding data of the multiple DPs according to a code rate for each DP; generating at least one signal frame by mapping the encoded data of the multiple DPs; and modulating data of the generated signal frame in an orthogonal frequency division multiplexing (OFDM) scheme, and transmitting the broadcast signal including data of the modulated signal frame.

Abstract: A nonbinary iterative detector-decoder (IDD) system. The IDD system comprises a detector, a decoder; and a nonbinary interface electrically connected between the detector and decoder. The interface is operative to convert a soft symbol and variance that is output by the detector into a corresponding nonbinary log likelihood ratio (LLR) vector that comprises one or more nonbinary LLRs, and to provide the LLR vector to the decoder. The interface is further configured to convert a nonbinary LLR vector comprised of one or more nonbinary LLRs that is output by the decoder into a corresponding soft symbol and variance, and to provide the soft symbol and variance to the detector.

Abstract: A system and method of adjusting an equivalent channel for a downlink in a multiple-antenna communication system is disclosed herein. The system includes at least one user device and a base station having a plurality of analog RF chains, each analog RF chain having a plurality of antennas. The method comprises the base station obtaining equivalent channel information and adjusting the phases of the antennas in order to modify equivalent channel gains from the analog RF chains to the at least one user device, based on the equivalent channel information.

Abstract: A communication device (alternatively, device) includes a processor configured to support communications with other communication device(s) and to generate and process signals for such communications. In some examples, the device includes a communication interface and a processor, among other possible circuitries, components, elements, etc. to support communications with other communication device(s) and to generate and process signals for such communications. A device directs an analog to digital converter (ADC) to perform a sample capture of a communication channel and processes that sample capture to generate a detected power. The device performs an integrate-and-dump (I&D) operation on the detected power over at least one time period to generate an integrated power and then generates an integrated power histogram of the communication channel that includes the integrated power.

Abstract: Embodiments are provided for cross-polarized antennas design with different down tilt angles that support versatile functionality, such as for MIMO or beamforming. An embodiment antenna circuit comprises a baseband signal processor, a pair of RF transmitters coupled to the baseband signal processor, a pair of PAs coupled to the RF transmitters, a 90°/180° hybrid coupler coupled to the RF transmitters, a pair of duplexers and two antennas coupled to the PAs. The two antennas are down tilted at different down tilt angles. A pair of signals is generated using the baseband signal processor, transmitted by the RF transmitters, and amplified using the PAs. Additionally, a 90° or 180° phase difference is introduced into the signals using the 90°/180° hybrid coupler. After the amplifying and introducing the phase difference, the signals are polarized at two different polarizations and down tilted at different down tilt angles using the two antennas.

Abstract: In a direct sequence spread-spectrum (DSSS) systems, such as CDMA, information is encoded in symbols using phase shift keying or quadrature amplitude modulation. Further, a transmitter applied a selected time shifted lag to each symbol to convey additional information. A receiver detects both the symbol data and the lag value. The receiver can use a hermetic matched filter matrix to identify the lag.

Abstract: A system includes a memory and an integrated circuit coupled to the memory. The integrated circuit is configured to communicate data in a channel characterized as a space having at least a frequency dimension. Anchor locations within the space correspond to respective regions of the space. The integrated circuit is further configured to determine a first inverse of a first matrix that corresponds to a first channel matrix for a first anchor location of the anchor locations. The first anchor location corresponds to a first region of the regions. The integrated circuit is further configured to perform an access link process for a second location other than the first anchor location but within the first region, the access link process using the first inverse determined for the first anchor location.

Abstract: A transceiver processing hardware (“TPH”) configured to process wireless bit stream(s) includes a minimum mean square error (“MMSE”), an inverse discrete Fourier transform (“IDFT”), a demapper, a descrambler, and a combiner. While MMSE estimates transmit the bit stream, IDFT generates samples associated with the frequency of the bit stream. The demapper, in one embodiment, is configured to discard one or more unused constellation points relating to the frequency of bit stream from the mapping rules. The demapper, in one aspect, includes one or more minimum function components (“MFCs”) and a special treatment component (“STC”). MFCs are able to receive and compare bit stream(s) representing a symbol which corresponds to a quadrature amplitude modulation (“QAM”). STC, in one aspect, is able to force infinity values to the MFCs when the bit stream or stream of bits is identified as ACK or RI with a predefined encoding category.

Abstract: An eNB is configured to perform a method for coordinating downlink power per layer at an eNB in a multiple-input, multiple-output (MIMO) network. The method includes receiving feedback from at least one UE; calculating a plurality of MIMO gradients based on the received feedback; changing a power per layer according to the calculated MIMO gradients; and exchanging gradient power information between the eNB and at least one neighboring eNB.

Abstract: The present invention relates to a wireless communication system. A method by which a base station transmits a downlink signal in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: receiving first and second precoding matrix indicators (PMIs) from a terminal; determining a first matrix (W1) from a first codebook on the basis of the first PMI, determining a second matrix (W2) from a second codebook on the basis of the second PMI, and determining a precoding matrix (W) on the basis of the first matrix (W1) and the second matrix (W2); performing precoding by using the determined precoding matrix (W) at two or more layers to which a downlink signal is mapped; and transmitting a precoded signal to the terminal, wherein all precoding vectors included in the precoding matrix (W) have linear phase increment properties and can be orthonormal to one another.

Abstract: A digital predistortion processing method and system comprises extracting from a predistortion coefficient parameter table a predistortion parameter corresponding to an input signal, so as to predistort the input signal and obtain a forward transmission signal; amplifying the power of the forward transmission signal to obtain an output signal; acquiring the output signal to obtain a feedback signal; delaying a predetermined number of sampling points so as to acquire the forward transmission signal and obtain a reference signal; conducting synchronization-related calculation on the reference signal and the feedback signal, and calibrating the feedback signal; training a predistortion coefficient according to the reference signal and the calibrated feedback signal; and forming the predistortion coefficient parameter table according to the predistortion coefficient and the amplitude of the input signal.

Abstract: A receiver that receives a reference symbol comprising a sequence of a plurality of synchronization repetition patterns, wherein each repetition pattern contains a predetermined number of samples. The reference symbol is part of a digital signal modulated by using OFDM modulation. An end synchronization repetition pattern in the reference symbol is phase-shifted by 180°, and the phase-shifted synchronization repetition pattern is positioned after the sequence of the number of synchronization repetition patterns. The receiver detects a timing of a correlation peak at the end of said reference symbol by performing a cross-correlation of the synchronization repetition patterns.

Abstract: The invention is a method and a system for updating pre-distortion coefficients, which is used to solve the problem of interference with neighbor cells due to the inferior pre-distortion coefficients. The method includes: presetting a primary table and a standby table, which store default and updated pre-distortion coefficients respectively; when a data source of a pre-distortion processor adopts the standby table, adopting the updated pre-distortion coefficients to perform parameter output processing to acquire pre-distortion parameters, and conveying the pre-distortion parameters and an input signal to the pre-distortion processor to process to acquire pre-distortion signals; conveying the pre-distortion signals through various signal processors to acquire a first signal, and determining the power data of the first signal; and based on the comparing result of the power data of the first signal and a setting range, there are different actions.

Abstract: A signal transmitting and receiving method and an apparatus for selecting an interference pattern from a security key and transmitting and receiving a signal based on the selected interference pattern are provided.

Abstract: A receiver that receives a reference symbol comprising a sequence of a plurality of synchronization repetition patterns, wherein each repetition pattern contains a predetermined number of samples. The reference symbol is part of a digital signal modulated by using OFDM modulation. An end synchronization repetition pattern in the reference symbol is phase-shifted by 180°, and the phase-shifted synchronization repetition pattern is positioned after the sequence of the number of synchronization repetition patterns. The receiver detects a timing of a correlation peak at the end of said reference symbol by performing a cross-correlation of the synchronization repetition patterns.

Abstract: Various embodiments include an apparatus to be employed by an enhanced Node B (eNB), the apparatus comprising communication circuitry to receive, from a user equipment (UE), feedback information and control circuitry, coupled with the communication circuitry, to identify a codeword from a three-dimensional codebook based on the feedback information received from the UE, wherein the communication circuitry is further to precode data to be transmitted to the UE based on the codeword. An apparatus to be employed by a UE and additional methods are described.

Abstract: A PLC network system and method operative with OFDM for generating MIMO frames with suitable preamble portions configured to provide backward compatibility with legacy PLC devices and facilitate different receiver tasks such as frame detection and symbol timing, channel estimation and automatic gain control (AGC), including robust preamble detection in the presence of impulsive noise and frequency-selective channels of the PLC network. A PLC device may include a delayed correlation detector and a cross-correlation detector operating in concert to facilitate preamble detection in one implementation.

Abstract: A received signal that includes a target signal and an interference signal is sampled in space and time and then filtered into a matched-filtered signal and into a mis-matched-filtered signal, which is orthogonal to, or nearly orthogonal to, the matched-filtered signal The interference signal is present in both the matched-filtered signal and the mis-matched-filtered signal, whereas the target signal is present in only the matched-filtered signal. In the mis-matched-filtered signal, the interference signal is different from the matched-filtered signal in the temporal property, but is the same as the matched-filtered signal in the spatial property. After the matched-filtered signal and the mis-match-filtered signals have been obtained for the signals received by each antenna element of an array of antenna elements, they are processed to obtain a result vector, W, that is a representation of the target signal without the interference.

Abstract: A method is disclosed. The method includes sampling a data signal having a voltage value at an expected edge time of the data signal. A first alpha value is generated, and a second alpha value generated in dependence upon the voltage value. The data signal is adjusted by the first alpha value to derive a first adjusted signal. The data signal is adjusted by the second alpha value to derive a second adjusted signal. The first adjusted signal is sampled to output a first data value while the second adjusted signal is sampled to output a second data value. A selection is made between the first data value and the second data value as a function of a prior received data value to determine a received data value.