Abstract: A coding and modulation apparatus and method are presented. The apparatus comprises an encoder that encodes input data into cell words, and a modulator that modulates said cell words into constellation values of a non-uniform constellation. The modulator is configured to use, based on the total number M of constellation points of the constellation and the code rate, a non-uniform constellation from one or several groups of constellations each comprising one or more constellations.

Abstract: Communication systems are described that use unequally spaced constellations that have increased capacity compared to conventional constellations operating within a similar SNR band.

Abstract: An apparatus and digital signal processing means are disclosed for excision of co-channel interference from signals received in crowded or hostile environments using spatial/polarization diverse arrays, which reliably and rapidly identifies communication signals with transmitted features that are self-coherent over known framing intervals due to known attributes of the communication network, and exploits those features to develop diversity combining weights that substantively excise that co-channel interference from those communication signals, based on differing diversity signature, timing offset, and carrier offset between the network signals and the co-channel interferers. In one embodiment, the co-channel interference excision is performed in an appliqué that can be implemented without coordination with a network transceiver.

Abstract: The present disclosure provides a method for transmitting and receiving in a wireless communication system and an apparatus therefore. Specifically, in a wireless communication system according to an embodiment of the present disclosure, there is provided a method for transmitting and receiving a signal by a receiving apparatus, the method includes receiving, from a transmitting apparatus, signals modulated based on a differential phase shift keying (DPSK) method through a plurality of reception paths, calculating a differential value in each reception path of the plurality of reception paths based on the received signals, and calculating reliability for the received signals, in which the reliability is proportional to a real value of a sum of the differential values in each reception path of the plurality of reception paths.

Abstract: Communication systems are described that use unequally spaced constellations that have increased capacity compared to conventional constellations operating within a similar SNR band.

Abstract: The present disclosure relates to a method (50) for transmitting a data stream from a transmitting device (30) to a receiving device (40), the data stream comprising m data sub-streams, said method (50) comprising: encoding (S51) the data sub-streams with respective polar codes, such as to produce m polar-encoded data sub-streams, modulating (S52) the m polar-encoded data sub-streams onto symbols of a multilevel modulation comprising m levels defining 2m different symbols, such as to produce a symbol stream, transmitting (S53) the symbol stream to the receiving device (40), wherein the 2m symbols of the multilevel modulation are distributed in the complex plane such that they are regularly spaced along the real axis and the complex axis by a spacing factor K, the predetermined labeling function Z being such that ?(Z)<1.7m×(0.0425×m?0.

Abstract: Systems and methods are provided for architectures for an analog feedback class D modulator that increase the power efficiency of the class D modulator. In particular, systems and methods are provided for an analog feedback class D modulator having a digital feed-forward loop. The digital feed-forward loop allows for removal of signal content from an input to an analog-to-digital converter, such that the ADC processes just noise and/or error. Using the techniques discussed herein, the loop filter is low power as it processes error content but not signal content.

Abstract: A transmission method includes mapping processing, phase change processing, and transmission processing. In the mapping processing, a plurality of first modulation signals and a plurality of second modulation signals are generated using a first mapping scheme, and a plurality of third modulation signals and a plurality of fourth modulation signals are generated using a second mapping scheme. In the phase change processing, a phase change is performed on the plurality of second modulation signals and the plurality of fourth modulation signals using all N kinds of phases. In the transmission processing, the first modulation signals and the second modulation signals are respectively transmitted at a same frequency and a same time from different antennas, and the third modulation signals and the fourth modulation signals are respectively transmitted at a same frequency and a same time from the different antennas.

Abstract: A Phase Locked Loop PLL circuit and method therein for generating multiphase output signals are disclosed. The PLL circuit includes a digitally controlled oscillator, a sample circuit, an analog to digital converter and a digital processing unit. The digital processing unit comprises a phase estimator configured to estimate a phase of the multiphase output signals, a differentiator configured to calculate a phase difference between a current phase and a previous phase, and an accumulator configured to accumulate the phase differences generated by the differentiator. The PLL circuit further comprises a loop filter configured to receive an output from the accumulator and generate a control signal to the digitally controlled oscillator to adjust frequency of the digitally controlled oscillator generating the multiphase output signals.

Abstract: Disclosed are a channel reciprocity-based precoding matrix configuration method and apparatus. The method includes: in downlink transmission, a network side separately sends, on each antenna port associated with each transmission layer, a CSI-RS subjected to beamforming to a terminal by using beams calculated according to angle information and delay information determined on the basis of uplink channel state information, and determines a precoding matrix for downlink transmission of the terminal according to beams sent on K0 antenna ports selected by the terminal on the basis of the CSI-RS, and a beam combination coefficient set.

Abstract: A wireless communication method in a wireless communication system which includes a radio transmitting station apparatus having a plurality of antennas and a radio receiving station apparatus having an antenna and which performs transmission and reception of a radio signal with a single carrier, the wireless communication method including: the radio receiving station apparatus or the radio transmitting station apparatus estimating a communication path matrix based on a training signal; the radio receiving station apparatus or the radio transmitting station apparatus transforming the communication path matrix into a frequency domain, calculating a pseudo inverse matrix for each frequency with respect to the transformed frequency domain communication path matrix, and transforming the calculated pseudo inverse matrix into a time domain and adopting as a transmission weight matrix; and the radio transmitting station apparatus forming a transmission beam based on the transmission weight matrix.

Abstract: Communication systems are described that use unequally spaced constellations that have increased capacity compared to conventional constellations operating within a similar SNR band.

Abstract: A method of encoding input data includes identifying an input packet of the input data, the input packet including a plurality of input words, each of the input words including pre bits, groupID bits, and post bits, organizing the plurality of input words into a plurality of groups based on groupID bits of the plurality of input words, identifying a key group of the plurality of groups based on a number of input words in each of the plurality of groups, determining a key value based on the pre bits, the groupID bits, and the post bits of one of the plurality of input words corresponding to the key group, and generating a plurality of coded words based on the key value and the plurality of input words.

Abstract: Communication systems are described that use unequally spaced constellations that have increased capacity compared to conventional constellations operating within a similar SNR band.

Abstract: Communication systems are described that use unequally spaced constellations that have increased capacity compared to conventional constellations operating within a similar SNR band.

Abstract: Communication systems are described that use unequally spaced constellations that have increased capacity compared to conventional constellations operating within a similar SNR band.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, an indication of a change in a non-linearity model associated with a power amplifier of the base station. The UE may update a model associated with the power amplifier based at least in part on the indication. The UE may further update at least one parameter associated with slicing received signals based at least in part on the indication. In some aspects, the UE may use at least two coefficients when slicing. Numerous other aspects are described.

Abstract: Communication systems are described that use unequally spaced constellations that have increased capacity compared to conventional constellations operating within a similar SNR band.

Abstract: Transmission of baseband and carrier-modulated vector codewords, using a plurality of encoders, each encoder configured to receive information bits and to generate a set of baseband-encoded symbols representing a vector codeword; one or more modulation circuits, each modulation circuit configured to operate on a corresponding set of baseband-encoded symbols, and using a respective unique carrier frequency, to generate a set of carrier-modulated encoded symbols; and, a summation circuit configured to generate a set of wire-specific outputs, each wire-specific output representing a sum of respective symbols of the carrier-modulated encoded symbols and at least one set of baseband-encoded symbols.

Abstract: Communication systems are described that use unequally spaced constellations that have increased capacity compared to conventional constellations operating within a similar SNR band.