Abstract: Some embodiments relate to systems and methods for communication of electronic signals. An example method includes receiving a first signal having a predetermined modulation. The example method includes generating a transmission for a second signal by superimposing the second signal on the modulation of the first signal by adjusting at least one of two phase states or two amplitude states of the modulation using a Reconfigurable Intelligent Surface (RIS). The example method also includes transmitting the second signal using hierarchical modulation, the predetermined modulation and the superimposed second signal on the predetermined modulation, wherein the first signal is transmitted at a higher data rate than the second signal.

Abstract: A method of transmission for increasing communication channel capacity comprising superposing a first signal on a second signal to form a combined signal, wherein allocation of users of the communication channel to the first and second signals is based dynamically on channel conditions.

Abstract: A method of transmission for increasing communication channel capacity comprising superposing a first signal on a second signal to form a combined signal, wherein allocation of users of the communication channel to the first and second signals is based dynamically on channel conditions.

Abstract: A method of transmission for increasing communication channel capacity comprising superposing a first signal on a portion of a second signal to form a combined signal, wherein the first signal comprises a repetition coded signal, and transmitting the combined signal. Also disclosed is a method of receiving a combined signal for increasing communication channel capacity comprising performing threshold detection on the combined signal wherein the combined signal comprises a first signal comprising a repetition coded signal superposed on a portion of a second signal and the threshold detection enables derivation of the second signal and the first signal prior to repetition coding.

Abstract: A method of transmission for increasing communication channel capacity comprising superposing a first signal on a portion of a second signal to form a combined signal, wherein the first signal comprises a repetition coded signal, and transmitting the combined signal. Also disclosed is a method of receiving a combined signal for increasing communication channel capacity comprising performing threshold detection on the combined signal wherein the combined signal comprises a first signal comprising a repetition coded signal superposed on a portion of a second signal and the threshold detection enables derivation of the second signal and the first signal prior to repetition coding.

Abstract: A method of spatially multiplexing data comprising a signal vector, the method comprising selecting first and second modulation schemes for the data transmission wherein the second modulation scheme is an interpolation in the plane of the first modulation scheme; and further wherein the modulation schemes are selected so as to maintain the same minimum Euclidean distance between vectors comprising the first and second modulation schemes as the minimum Euclidean distance within the first and second modulation schemes; and selecting a plurality of antennae, each of the plurality to concurrently transmit respective symbols of the signal vector.

Abstract: A method of spatially multiplexing data comprising a signal vector, the method comprising selecting first and second modulation schemes for the data transmission wherein the second modulation scheme is an interpolation in the plane of the first modulation scheme; and further wherein the modulation schemes are selected so as to maintain the same minimum Euclidean distance between vectors comprising the first and second modulation schemes as the minimum Euclidean distance within the first and second modulation schemes; and selecting a plurality of antennae, each of the plurality to concurrently transmit respective symbols of the signal vector.

Abstract: A method of transmitting data comprising choosing a transmit modulation scheme of the transmission, choosing a transmit parameter of the transmission, transmitting the data stream according to the chosen transmit modulation and transmit parameter such that data of the data stream is transmitted by the modulation scheme and the choice of transmit parameter.

Abstract: A method of transmitting data comprising choosing a transmit modulation scheme of the transmission, choosing a transmit parameter of the transmission, transmitting the data stream according to the chosen transmit modulation and transmit parameter such that data of the data stream is transmitted by the modulation scheme and the choice of transmit parameter.

Abstract: A method and apparatus are provided for transmission in a communication system. The system includes a transmitter having at least one first and second antenna and a receiver, which includes at least one receiving antenna. The method includes determining a transmit diversity scheme for at least one group of symbols from among a plurality of modulated symbols. This step includes at least one step of obtaining a phase shift of at least one symbol of the at least one group of symbols. The phase shift is based on: at least one phase shift parameter N; and responses (hk1, hk2), respectively, between the at least one first antenna and the at least one receiving antenna and between the at least one second antenna and the at least one receiving antenna. The method further includes a step of phase shifting, allowing rotation of said symbol at a multiple of a ?/N value.

Abstract: A method is provided for transmitting radio signals. Two channels are defined by two transmit antennas, having two orthogonal directions, together with two receive antennas, having two orthogonal directions. An optimal quality of one received signal is determined by signal processing, which emulates a rotation of the two orthogonal receive directions, and a mutual interference of the signals received on the two channels, due to a polarization mismatch, is cancelled, based on a corresponding optimal rotation angle.

Abstract: An embodiment of a method for transmitting a sequence of symbols through at least a channel in a wireless communication system includes: forming a coding matrix with the sequence of symbols, each component of the coding matrix being a linear combination of two symbols among a first, a second, a third, and a fourth symbol (s1, s2, s3 , s4), transmitting a first component and a second component of a first column and of a second column of the coding matrix through a first transmit antenna and a second transmit antenna at a first and a second time slot wherein the coding matrix is defined as ( as 1 + bs 3 - cs 2 * - ds 4 * as 2 + bs 4 cs 1 * + ds 3 * ) , a, b, c, d being complex numbers of modulus 1.

Abstract: The invention provides a device (D2) for reducing ingress noise in a digital signal, comprising a noise predictor (20) for predicting an amount of ingress noise in the digital signal (sn) based on past samples of the ingress noise, and a subtractor (21) for subtracting the predicted amount of ingress noise from the digital signal. Channel distortion is compensated for by a noise-independent equalizer (25), such as a ZF equalizer, placed upstream of the noise predictor (20). The device (D2) may be incorporated, for example, in a cable modem termination system (CMTS) of an hybrid fiber/coax (HFC) network.

Abstract: A method and apparatus are provided for transmission in a communication system. The system includes a transmitter having at least one first and second antenna and a receiver, which includes at least one receiving antenna. The method includes determining a transmit diversity scheme for at least one group of symbols from among a plurality of modulated symbols. This step includes at least one step of obtaining a phase shift of at least one symbol of the at least one group of symbols. The phase shift is based on: at least one phase shift parameter N; and responses (hk1, hk2), respectively, between the at least one first antenna and the at least one receiving antenna and between the at least one second antenna and the at least one receiving antenna. The method further includes a step of phase shifting, allowing rotation of said symbol at a multiple of a ?/N value.

Abstract: The invention provides a device (D2) for reducing ingress noise in a digital signal, comprising a noise predictor (20) for predicting an amount of ingress noise in the digital signal (sn) based on past samples of the ingress noise, and a subtractor (21) for subtracting the predicted amount of ingress noise from the digital signal. Channel distortion is compensated for by a noise-independent equalizer (25), such as a ZF equalizer, placed upstream of the noise predictor (20). The device (D2) may be incorporated, for example, in a cable modem termination system (CMTS) of an hybrid fiber/coax (HFC) network.

Abstract: An embodiment of a method for decoding a received signal function of at least a channel matrix B, and of a first and second symbols S1, and S2 belonging to a signal constellation. The method comprises the steps of: selecting a set of values of the first symbol S1 in the signal constellation; for each selected value of the first symbol S1: estimating the value of the second symbol S2 to generate an estimated value of the second symbol; calculating an Euclidean distance between the received signal and a noiseless signal defined by the first symbol with said selected value and by the second symbol with said estimated value; selecting the minimal Euclidean distance among the Euclidean distances respectively calculated for the different selected values of the set of possible values of the first symbol; and selecting decoded first and second symbols corresponding to the selected minimum Euclidean distance.

Abstract: The invention provides a device for reducing ingress noise in a digital signal, comprising a noise predictor for predicting an amount of ingress noise in the digital signal based on past samples of the ingress noise, and a subtractor for subtracting the predicted amount of ingress noise from the digital signal. Channel distortion is compensated for by a noise-independent equalizer, such as a ZF equalizer, placed upstream of the noise predictor. The device may be incorporated, for example, in a cable modem termination system (CMTS) of an hybrid fiber/coax (HFC) network.

Abstract: An embodiment of a method for transmitting a sequence of symbols through at least a channel in a wireless communication system comprises at least the steps of: forming a coding matrix (MC) with said sequence of symbols, each component of the coding matrix (MC) being a linear combination of two symbols among a first, a second, a third, and a fourth symbol (s1, s2, s3, s4), transmitting a first and a second components of a first column and of a second column of the coding matrix through a first and a second transmit antennas (Tx1, Tx2), at a first and a second time slot (T1, T2). The coding matrix (MC) is defined as: ( as 1 + bs 3 - cs 2 * - ds 4 * as 2 + bs 4 cs 1 * + ds 3 * ) , a, b, c, d being complex numbers of modulus 1.

Abstract: A method is provided for transmitting radio signals. Two channels are defined by two transmit antennas, having two orthogonal directions, together with two receive antennas, having two orthogonal directions. An optimal quality of one received signal is determined by signal processing, which emulates a rotation of the two orthogonal receive directions, and a mutual interference of the signals received on the two channels, due to a polarization mismatch, is cancelled, based on a corresponding optimal rotation angle.

Abstract: A peak power reduction method for wireless communication systems is proposed in which a constellation shaping is applied on input data symbols in order to reduce the peak power of the signal samples to be transmitted by the communication system. According to the invention, the symbols are modified using functions each representing the contribution of a symbol to the output signal samples of large magnitude.