Systems and methods for transpositional modulation and demodulation are provided. One such method for generating a signal includes the steps of providing a look-up table having a plurality of quarter-cycle waveforms, each of said quarter-cycle waveforms associated with a respective input level; receiving an input signal; and outputting quarter-cycle waveforms associated with levels of the received input signal. Systems for transpositional modulation are also provided. One such system for generating a signal includes a look-up table having a plurality of quarter-cycle waveforms. Each of the quarter-cycle waveforms are associated with a respective input level, and the look-up table is configured to receive an input signal, and output quarter-cycle waveforms associated with levels of the received input signal.

Systems and methods for transpositional modulation and demodulation are provided. One such method for generating a signal includes the steps of providing a look-up table having a plurality of quarter-cycle waveforms, each of said quarter-cycle waveforms associated with a respective input level; receiving an input signal; and outputting quarter-cycle waveforms associated with levels of the received input signal. Systems for transpositional modulation are also provided. One such system for generating a signal includes a look-up table having a plurality of quarter-cycle waveforms. Each of the quarter-cycle waveforms are associated with a respective input level, and the look-up table is configured to receive an input signal, and output quarter-cycle waveforms associated with levels of the received input signal.

Methods, systems, and devices for wireless communications are described for optimizing index modulated (IM) communications between a user equipment (UE) and a base station. The UE may identify a quantity of subcarriers for IM communications and transmit a message including an indication of the quantity of subcarriers to the base station. In some examples, the UE may transmit an indication of one or more subcarriers to exclude from IM communications. The base station may receive the indication of the quantity of subcarriers and/or the indication of the blacklisted subcarrier(s) and may determine a number of active subcarriers to be used based on at least the indication of the quantity of subcarriers. The base station may transmit an indication of the number of active subcarriers to the UE. The UE may process one or more received IM downlink signals based on the quantity of subcarriers.

Methods and apparatuses for providing control signals for a transmission from a transmitting device to a receiving device using a mobile communication connection that comprises a voice channel are described. The control signals are used for controlling the operation of the receiving device.

Methods and apparatuses for providing control signals for a transmission from a transmitting device to a receiving device using a mobile communication connection that comprises a voice channel are described. The control signals are used for controlling the operation of the receiving device.

A multi-tone communication system, a multi-tone signal demodulation device and a method thereof are provided. The multi-tone communication system includes a modulation device and a demodulation device. The modulation device can generate and broadcast a multi-tone audio signal corresponding to a control command. The demodulation device includes a sound receiving module, a data processor and a controller. The sound receiving module can receive the multi-tone audio signal. The data processor can process the multi-tone audio signal to obtain at least two tones carried on the multi-tone audio signal, and determine whether frequency drifts of the at least two tones are consistent, and if yes, the data processor decodes the at least two tones to generate an execution command. The controller executes the execution command.

A transmission device includes a transmitter having circuitry that converts a first-type bit sequence and a second-type bit sequence into a complex signal point sequence. Each of a plurality of complex signal points included in the complex signal point sequence represents an element of one of a plurality of complex signal point sets. In the complex signal point sequence, the applicable patterns of the plurality of complex signal point sets correspond to the first-type bit sequence in a plurality of predetermined combinations of candidates for the first-type bit sequence and the applicable patterns. Each complex signal point included in the complex signal point sequence corresponds to the second-type bit sequence.

A transmission device includes a transmitter having circuitry that converts a first-type bit sequence and a second-type bit sequence into a complex signal point sequence. Each of a plurality of complex signal points included in the complex signal point sequence represents an element of one of a plurality of complex signal point sets. In the complex signal point sequence, the applicable patterns of the plurality of complex signal point sets correspond to the first-type bit sequence in a plurality of predetermined combinations of candidates for the first-type bit sequence and the applicable patterns. Each complex signal point included in the complex signal point sequence corresponds to the second-type bit sequence.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration signal indicating a codebook construction configuration for constructing a codebook of sequences for conveying a first type of uplink payload in a resource block that is orthogonal to a second type of uplink payload transmitted from a second UE in the resource block. The UE may construct the codebook of sequences for the first type of uplink payload according to the codebook construction configuration. The UE may generate the first type of uplink payload for transmission using a first sequence from the codebook of sequences. The UE may transmit the first type of uplink payload in the resource block, wherein the first type of uplink payload is multiplexed in the resource block with the second type of uplink payload from the second UE.

The present disclosure relates to methods and devices for wireless communication including an apparatus, e.g., a UE and/or base station. The apparatus can select one or more rows or one or more columns in a DFT matrix, the one or more rows being even-numbered rows in the DFT matrix and the one or more columns being even-numbered columns in the DFT matrix. The apparatus can also determine an orthogonal matrix based on the one or more rows or the one or more columns in the DFT matrix, the orthogonal matrix having a size of (M×N)×(M×N) with M×N rows and M×N columns. Also, the apparatus can determine a codebook based on the orthogonal matrix, the codebook including a plurality of codepoints. The apparatus can also transmit at least one signal including a first codepoint of the plurality of codepoints in the codebook.