A transceiver system includes a signal generator and controller circuit, a first signal converter circuit, an attenuator circuit, and a second signal converter circuit. Signal generator and controller circuit generates a transmitting baseband signal. First signal converter circuit generates a transmitting radio frequency signal according to transmitting baseband signal. Attenuator circuit generates an attenuated radio frequency signal according to transmitting radio frequency signal. Second signal converter circuit generates an attenuation range baseband reference signal according to attenuated radio frequency signal. Signal generator and controller circuit determines a first attenuation range for attenuator circuit according to attenuation range baseband reference signal when transmitting baseband signal is a dual-tone signal, and determines a second attenuation range from first attenuation range for attenuator circuit according to attenuation range baseband reference signal when transmitting baseband signal is a single-tone signal, and second attenuation range is for a pre-distortion process.

There is disclosed a method for operating a wireless device in a wireless communication network, the method comprising modulating a plurality of input bits (N), wherein modulating comprises choosing a first number (k) of frequencies from a predetermined set of a total number (NF) of frequencies, the first number (k) being larger than 1, and performing quadrature amplitude modulation to a second number (NQ) on each of the first number (k) of frequencies. There are further disclosed related methods and devices.

Aspects of the present disclosure provide techniques for receiving and detecting short multi-user feedback in null data packets (NDPs). An example method generally includes receiving a first packet from a first wireless device, the first packet transmitted using resources spanning at least 106 tones and allocated to the first wireless device for conveying feedback bits, and detecting the feedback bits based on a difference in receive energy on different sets of tones.

Methods, systems, and devices for wireless communication are described that provide for generating a multicarrier wakeup signal that is modulated using multiple on-off keying (OOK) patterns. In some cases, the OOK pattern may be constructed using one or more of the following techniques: forward error correction (FEC) coding, spreading, encoding (e.g., DC balance encoding such as Manchester encoding), and orthogonal frequency division multiplexing (OFDM) overlay mapping. The resulting signal may serve to increase the sensitivity of the receiver. The OOK patterns may include on portions and off portions that are indicative of different bit values, such as a one bit or a zero bit. The multicarrier wakeup signal may be decoded by a first radio of a wireless device that compares the energy of the signal over different time periods to determine the bit value. Once determined, the wireless device may choose to activate a second radio for communication.

Techniques for sending signaling messages in a wireless communication network are described. In an aspect, a signaling message (e.g., a reduce interference request) may be sent by mapping it to at least one specific subcarrier among a set of subcarriers reserved for sending the signaling message. The at least one subcarrier may be selected based on the message value. A signal may be sent on the at least one subcarrier in multiple symbol periods to convey the signaling message. In another aspect, a reduce interference request may be sent based on an orthogonal resource among orthogonal resources available for sending reduce interference requests. In one design, an orthogonal sequence may be selected based on the request and may be spread across a resource segment. In another design, the reduce interference request may be processed to obtain modulation symbols, and each modulation symbol may be spread across multiple subcarriers in one symbol period.

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.

A simultaneous wireless information and power transmission method includes: transmitting an energy transfer signal comprising a peak-to-average power ratio (PAPR) corresponding to information to be transmitted at a first side; measuring the PAPR by receiving the energy transfer signal at a second side; and recovering the information from the measured PAPR at the second side.

Various aspects described herein relate to distinguishing frequency shift keying (FSK) signals transmitted by each user of multiple users in a wireless communications system. One or more symbols for transmitting in an FSK-modulated signal can be obtained by a user. The one or more symbols can be encoded based on a tone location assignment corresponding to a unique spreading code associated with the user. Quadrature amplitude modulation (QAM) and/or phase-shift keying (PSK) can be performed over at least one tone associated with the encoded symbols. Each user can transmit the encoded symbols to a receiving entity, where the receiving entity can decode each symbol received from the plurality of users to produce a distinguishable symbol for each user based on the unique spreading codes associated with each user.

Various aspects described herein relate to distinguishing frequency shift keying (FSK) signals transmitted by each user of multiple users in a wireless communications system. One or more symbols for transmitting in an FSK-modulated signal can be obtained by a user. The one or more symbols can be encoded based on a tone location assignment corresponding to a unique spreading code associated with the user. Quadrature amplitude modulation (QAM) and/or phase-shift keying (PSK) can be performed over at least one tone associated with the encoded symbols. Each user can transmit the encoded symbols to a receiving entity, where the receiving entity can decode each symbol received from the plurality of users to produce a distinguishable symbol for each user based on the unique spreading codes associated with each user.