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.

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.

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.

A method based on orthogonal frequency division multiplexing (OFDM) called OFDM-subcarrier gap and index modulation (OFDM-SGIM) is proposed in which the gaps between the active subcarriers are exploited to transmit extra bits alongside the conventional QAM symbols. Thereafter, the index modulation is combined with the new proposed OFDM-based scheme to guarantee a fixed subblock size.

A method based on orthogonal frequency division multiplexing (OFDM) called OFDM-subcarrier gap and index modulation (OFDM-SGIM) is proposed in which the gaps between the active subcarriers are exploited to transmit extra bits alongside the conventional QAM symbols. Thereafter, the index modulation is combined with the new proposed OFDM-based scheme to guarantee a fixed subblock size.

A method based on orthogonal frequency division multiplexing (OFDM) called OFDM-subcarrier gap and index modulation (OFDM-SGIM) is proposed in which the gaps between the active subcarriers are exploited to transmit extra bits alongside the conventional QAM symbols. Thereafter, the index modulation is combined with the new proposed OFDM-based scheme to guarantee a fixed subblock size.

A method based on orthogonal frequency division multiplexing (OFDM) called OFDM-subcarrier gap and index modulation (OFDM-SGIM) is proposed in which the gaps between the active subcarriers are exploited to transmit extra bits alongside the conventional QAM symbols. Thereafter, the index modulation is combined with the new proposed OFDM-based scheme to guarantee a fixed subblock size.

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.

The invention discloses a method of conveying information from a sender to a receiver by use of various codeword patterns given in a mapping table and detection through decoding via the reverse mapping process. The codeword patterns may be selected as combinations of bits, frequencies, ports, or other elements as desired. Associated systems for carrying out the described encoding methods are also provided. The various methods may be applicable in low transmit power, energy-saving, secure, low latency, storage and in military, mobile, optical, deep space and fixed telecommunication systems for long range transmission and reliable information.

The invention discloses a method of conveying information from a sender to a receiver by use of various codeword patterns given in a mapping table and detection through decoding via the reverse mapping process. The codeword patterns may be selected as combinations of bits, frequencies, ports, or other elements as desired. Associated systems for carrying out the described encoding methods are also provided. The various methods may be applicable in low transmit power, energy-saving, secure, low latency, storage and in military, mobile, optical, deep space and fixed telecommunication systems for long range transmission and reliable information.