Abstract: A method and system for selecting precoding matrix index are herein disclosed. The method includes determining a precoder and candidate beams, selecting base beams based on a correlation power between the determined precoder and determined candidate beams, and estimating amplitude coefficients and cophase coefficients by projecting a channel on the selected base beams.

Abstract: Design of precoding and feedback for user equipment (UE)—specific reference signals (UE-RS)—based open-loop and semi-open-loop multiple input, multiple output (MIMO) systems is discussed. Aspects of the present disclosure provide for sub-resource block (RB) random precoding that allows for greater diversity gain in a lower bandwidth. In addition, the precoding may be performed using resource element (RE)—level layer shifting that provides for a number of precoders to be assigned to a number of layers for every such continuous subcarrier. As such, two codewords may experience the same effective channel quality with channel quality indicators (CQI) being averaged across all of the layers.

Abstract: The embodiments described herein provide systems and methods for digital correction in low intermediate frequency (IF) receivers. Specifically, the embodiments described herein use digital correction techniques that can correct for signal distortions in low IF receivers caused by I-Q imbalance, including both I-Q magnitude imbalance and I-Q phase imbalance. In general, the embodiments described herein are implemented to at least partially cancel an image of a blocking signal in the complex digital signal. Such a cancellation can be implemented to at least partially cancel an image of blocking signal where that image occurs at or near the intermediate frequency. In one embodiment, a corrector is implemented in a low RF receiver and is configured to receive a complex digital signal that includes an image of a blocking signal. Such a low RF receiver can further include a trainer configured to train the corrector to generate the cancellation signal.

Abstract: Methods, systems, and storage media for providing multi-cell, multi-point single user (SU) multiple input and multiple output (MIMO) operations are described. In embodiments, an apparatus may receive and process a first set of one or more independent data streams received in a downlink channel from a first transmission point. The apparatus may receive and process a second set of one or more independent data streams received in a downlink channel from a second transmission point. The apparatus may process control information received from the first transmission point or the second transmission point. The control information may include an indication of a quasi co-location assumption to be used for estimating channel characteristics for reception of the first set of one or more independent data streams or the second set of one or more independent data streams. Other embodiments may be described and/or claimed.

Abstract: The embodiments described herein provide systems and methods for digital correction in low intermediate frequency (IF) receivers. Specifically, the embodiments described herein use digital correction techniques that can correct for signal distortions in low IF receivers caused by I-Q imbalance, including both I-Q magnitude imbalance and I-Q phase imbalance. In general, the embodiments described herein are implemented to at least partially cancel an image of a blocking signal in the complex digital signal. Such a cancellation can be implemented to at least partially cancel an image of blocking signal where that image occurs at or near the intermediate frequency. In one embodiment, a corrector is implemented in a low RF receiver and is configured to receive a complex digital signal that includes an image of a blocking signal. Such a low RF receiver can further include a corrector controller to selectively enable the corrector.

Abstract: A contactless payment device and method transmits a sequence of magnetic-field pulses directly to two or three magnetic-stripe read heads of a point-of-sale terminal. The baud rate at which the data is transmitted is modulated so that track data for one read head channel will be ignored by another read head channel, based on the change to the baud rate and/or the rate of change in the baud rate to improve acceptance of the transmitted pulses received by the read heads of the point-of-sale terminal.

Abstract: An apparatus configured to acquire S-parameters of a communications channel includes a physical interface configured to transmit and receive signals through a communications channel under test, a processor, configured to execute instructions that, when executed cause the processor to: send a first data pattern from the transmitter through the communications channel at a first data rate; acquire a first waveform corresponding to the first data pattern and determine a first pulse response; calculate a first transfer function from the first pulse response; send a second data pattern from the transmitter through the communications channel at a second data rate; acquire a second waveform corresponding to the second data pattern and determine a second pulse response; calculate a second transfer function from the second pulse response; and combine the first and second transfer functions to determine an S-parameter of the communications channel.

Abstract: Embodiments are disclosed for full-rate phase detection for a pulse amplitude modulation N (PAM-N) signal. The example method includes sampling an incoming signal in one or more sampling times. The example method further includes determining that an amplitude associated with a current sampling time is within an upper threshold and a lower threshold for each sampling time of the one or more sampling times. The example method further includes upon determining that the amplitude of the current sampling time is within the upper threshold and the lower threshold, determining an amplitude range associated with an immediately preceding sampling time and an amplitude range associated with an immediately subsequent sampling time. The example method further includes determining a transition status representing one of an upward transition, a downward transition, or no transition with respect to the current sampling time.

Abstract: The present invention provides a methods, apparatus and systems for improving a systems-level data rate on a communications link such the orthogonal frequency division multiplexed multiple access (OFDMA) downlink used in used in WiFi and LTE cellular/wireless mobile data applications. The present invention preferably uses a form of multilevel coding and decoding known as tiled-building-block encoding/decoding. With the present invention, different receivers coupled to different parallel downlink channels with different channel qualities decode different received signal constellations at different levels of resolution. This allows the downlink of the OFDMA system to operate with a significantly higher data rate, thus eliminating existing inefficiencies in the downlink and significantly increasing system level bandwidth efficiency.

Abstract: A bi-directional active combiner and splitter using bi-directional variable gain amplifiers (BD_VGAs) is proposed. Advantages of the proposed bi-directional active combiner and splitter includes the following 1) compact size—for each BD_VGA, cascode transistor pair is small and the same matching network is used by the cascode transistor pair for both directions; 2) high efficiency—no switching loss in signal path, only switched matching; 3) reduced passive trace loss and power consumption—simplified signal interconnection; 4) active current combining—eliminates large size in the passive combiner; 5) high input-output isolation—cascode and neutralization; 6) precise gain control and unequal combining or splitting—changing the gain of the BD_VGA; and 7) phase-invariant amplifier design.

Abstract: An apparatus to transmit and receive wireless communications is disclosed in which the transmit circuitry includes a square root raised cosine filter to pulse shape modulate signals and the receive circuitry includes a higher order Nyquist receive filter coupled to receive the input signals and remove the pulse shaping modulation. The cascaded combination of the transmit and receive filters has a frequency response equivalent to a higher order generalized raised cosine filter response.

Abstract: A wireless communication method for receiving an orthogonal time frequency space (OTFS) modulated signal includes receiving the OTFS signal over a wireless communication channel, dividing the receiving OTFS signal along a delay-dimension into a plurality of segments, performing, for each segment, channel estimation independent of channel estimation for other segments to generate a plurality of channel estimates, performing, for each segment, channel equalization using a corresponding channel estimate from the plurality of channel estimates to generate a channel-equalized symbol stream, and generating information bits from the channel-equalized symbol stream.

Abstract: Aspects of the subject disclosure may include, receiving a communication signal, and generating an electromagnetic wave that propagates along an outer surface of a dielectric layer environmentally formed on a cable. The dielectric layer can be a liquid disposed on an outer surface of the cable that enables the electromagnetic wave to propagate along the dielectric layer of the cable without an electrical return path, and conveys the communication signal. Other embodiments are disclosed.

Abstract: There is provided a decoder for decoding a data signal received through a transmission channel in a communication system, the decoder (310) comprising a symbol estimation unit (311) configured to determine estimated symbols representative of the transmitted symbols carried by the received signal, the estimated symbols being determined from nodes of a decoding tree based on a weight metric associated with each of the node. The decoder further comprises a termination alarm monitoring unit (312) for monitoring a termination alarm depending on the current decoding computation complexity, the termination alarm being associated with a metric parameter, the symbol estimation unit being configured to reduce the weight metric of each node of the decoding tree by a quantity corresponding to a function of the metric parameter associated with the termination alarm, in response to the triggering of the termination alarm.

Abstract: A multi-antenna signal encoding method comprises receiving an antenna signal and a reference signal a first mixer; producing, using the first mixer, a down-converted signal based on the antenna signal and the reference signal; receiving, at one or more second mixers, second antenna signals and second reference signals orthogonal to the first reference signal; producing one or more second down-converted signals based on the one or more second antenna signals and the one or more second reference signals; converting, using an analog-to-digital converter, a summation signal corresponding to a sum of the first down-converted signal and the one or more second down-converted signals, into a digital receive-signal; and extracting, at a processor, a plurality of digital signals from the digital receive-signal, wherein each of the plurality of digital signals corresponds to one of the first antenna signal and the one or more second antenna signals.

Abstract: A waveform shaping device that includes an adaptable surface, a controller, and a receiving device which measures a secondary wave following the reception of a primary wave by a receiver, the primary wave having been transmitted by a transmitter. Based on the measurement of the secondary wave, the controller determines an estimated value for optimization of the adaptable surface, without any connection to the receiver.

Abstract: Systems and methods are provided for dynamically determining antenna array mode assignment for transmission of downlink power to one or more wireless communication devices (WCD). The system comprises an access point that is configured to transmit wireless downlink signals to a WCD using a first communication protocol and a second communication protocol. A processor collects data over a predetermined time period, which may include sector load data and WCD location data. Then, the processor analyzes the data collected and based on such analysis, determines the antenna array mode assignment. In some aspects, the processor also determines whether there is MU-MIMO grouping between two or more WCDs.

Abstract: The present disclosure relates to a first radio node configured for orthogonal frequency division multiplexing (OFDM), comprising a receiver, a transmitter, a processor and a memory storing instructions executable by the processor for causing the transmitter in a first mode of operation with a first subcarrier spacing f1: to transmit a sequence of prefixed OFDM symbols, and in a second mode of operation with a second subcarrier spacing f2: to transmit a sequence of prefixed OFDM symbols, wherein the sequence of transmitted OFDM symbols is aligned with a predefined repeating radio frame, which is common to both the first and second modes of operation, or with an integer multiple of the predefined repeating radio frame; and the first and second subcarrier spacings are related by an integer factor, f1/f2=p or f1/f2=1/p, with p?1 integer.

Abstract: A data converter, a signal transmission method, and a signal transmission system for transmitting a signal to a programmable logic controller are provided. The data converter: performs sampling multiple times with respect to data detected by a sensor in one communication period of communication with a programmable logic controller; acquires statistical data by statisticizing a plurality of sampling data in the one communication period; and transmits the statistical data to the programmable logic controller when the one communication period is reached. Therefore, a signal sampling density is improved, and thus control accuracy can be enhanced. At the same time, a data transmission amount of a bus is reduced, a load on the programmable logic controller is reduced, and user convenience is improved.

Abstract: The present application provides a method and a device for transmitting feedback information. The method includes: determining, by a transmitting terminal, a first code book in accordance with a channel measurement result, precoding matrices included in the first code book being obtained through transformation of a same construction matrix; calculating, by the transmitting terminal, to obtain a first CQI in accordance with all or part of the precoding matrices in the first code book; and transmitting, by the transmitting terminal, first indication information for indicating the first code book and second indication information for indicating the first CQI to a receiving terminal.