In one example aspect, a method is provided of transmitting a plurality of data symbols. The method comprises transmitting a first on-off keyed signal corresponding to the data symbols, the first signal comprising a plurality of on periods and a plurality of off periods. Each on period comprises a first signal portion cyclically shifted within the on period by a respective random or pseudorandom factor.

In one example aspect, a method is provided of transmitting a plurality of data symbols. The method comprises transmitting a first on-off keyed signal corresponding to the data symbols, the first signal comprising a plurality of on periods and a plurality of off periods. Each on period comprises a first signal portion cyclically shifted within the on period by a respective random or pseudorandom factor.

Methods, systems, and devices for wireless communications are described. In one example, a transmitting device may identify first and second portions of data to include in a data transmission. The transmitting device may encode the second portion by a configuration of a first subset of resource elements. The transmitting device may transmit, via the data transmission, first signals representative of the first portion over the first subset and one or more second signals over a second subset of resource elements. A receiving device may receive the data transmission and may identify that the one or more second signals include content other than data of the data transmission. The receiving device may decode the first signals in order to identify the first portion and the configuration in order to identify the second portion. The receiving device may refrain from decoding the one or more second signals based on the identifying.

A method of transmitting a communication signal and electric power between two user stations of a bus system includes coupling the communication signal into a bus line via a low-pass filter that filters the communication signal, such that signal frequencies below a cut-off frequency of the low-pass filter are coupled into the bus line of the bus system. The method also includes coupling, using a power coupling device, electric power in the form of a high-frequency signal into the bus line, transmitting the communication signal and the electric power as a bus signal to an electrical load using the bus line, and decoupling the communication signal from the bus line via a low-pass filter that filters the bus signal, such that signal frequencies below the cut-off frequency of the low-pass filter are decoupled from the bus line of the bus system.

A method for audio transmission, the method may include receiving or generating a symbol of R bits; selecting a subset of K audio carrier frequencies that represent the symbol; wherein the subset is selected out of a set of N audio carrier frequencies; and concurrently transmitting the subset. (I); Floor is a floor function, and Log.sub.2 is a base two logarithm.

A method for audio transmission, the method may include receiving or generating a symbol of R bits; selecting a subset of K audio carrier frequencies that represent the symbol; wherein the subset is selected out of a set of N audio carrier frequencies; and concurrently transmitting the subset. (I); Floor is a floor function, and Log.sub.2 is a base two logarithm.

[Problem] To proposed a modulation mechanism for enabling achieving further enhancement in the resource efficiency.

[Solution] A transmission device includes a converting unit 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.

[Problem] To proposed a modulation mechanism for enabling achieving further enhancement in the resource efficiency.

[Solution] A transmission device includes a converting unit 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.

The present disclosure provides an uplink multiple access scheme and technique to enhance the overall spectral efficiency of wireless systems. The scheme and technique exploits an index modulation concept in orthogonal multiple access systems. A first subblock of transmitted data for a user is conventionally modulated, while a second subblock of the data determines the index of the active channel that will be used to communicate the modulated symbol. The scheme and technique enables all available orthogonal resources to be used for an arbitrary number of users as an extra source of information that is used to enhance the overall spectral efficiency in terms of error efficiency and energy efficiency.

Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different spatial location. Such methods and systems receive the plurality of transmitted signals at the plurality of receive elements to form a plurality of receive element signals, form a combined signal derived from the plurality of receive element signals, and detect each of the plurality of transmitted signals from the combined signal by its different spatial location. To achieve this, methods and systems consistent with this invention generate a plurality of arbitrary phase modulation signals, and phase modulate each of the plurality of receive element signals with a different one of the phase modulation signals to form a plurality of phase modulated signals. Such methods and systems then combine the plurality of phase modulated signals into a combined signal, generate expected signals, and cross-correlate the combined signal with the expected signals to form correlation signals. Such methods and systems then store the correlation signals in a correlation signal memory and analyze the correlation signals to extract information from the transmitted signals.