An embodiment of the present invention provides a method for generating a device-to-device (D2D) signal by a terminal in a wireless communication system, the method for generating a D2D signal comprising: a step of mapping, onto one or more resource block (RB) groups, each of one or more modulation symbol groups generated from one or more transmission blocks; and a step for applying different beam vectors to each of the one or more RB groups, wherein the number of beam vectors is determined according to a channel state.

Systems, methods, and computer-readable media are described herein which dynamically provide an optimized mechanism for switching uplink waveforms within a cellular network. An uplink profile generally indicates a number of transmission ports and what uplink waveform is used by a user device to transmit to a base station. A power headroom, channel conditions, and signal to interference plus noise ratio are used to modify the uplink profile. These inputs may be compared to upper and lower threshold values to provide optimal conditions to switch from a Cyclic Prefix Orthogonal Frequency Division Multiplexing waveform (CP-OFDM) to a Direct Fourier Transform Spread Orthogonal Frequency Division Multiplexing waveform (DFT-s-OFDM).

A method of transmitting demodulation reference signals (DMRS) over one, three or five resource blocks (RBs) with Interleaved Frequency Division Multiple Access (IFDMA) from a wireless device to a wireless network node in a wireless network wherein Single Carrier Frequency Division Multiple Access (SC-OFDMA) is deployed in uplink, is provided. At least one of: a set of base sequences including thirty quadrature phase shifting keying, QPSK, sequences of length 6, 18 or 30 is determined, a demodulation reference signal sequence is derived from the determined set of base sequences, the demodulation reference signal sequence is multiplexed, and the multiplexed demodulation reference signal sequence is transmitted, by the wireless device, to the wireless network node.

Systems and methods are disclosed for producing a cyclically generated, continuous-phase, frequency-shift keying (CG-CPFSK) waveform which may be used for wired and/or wireless communication systems. Such waveforms may have a substantially constant modulus and have an underlying cyclic phase structure. Systems and methods are also disclosed for generating a waveform based on a cyclically continuous signal which may be subsequently translated into a radio frequency for transmission.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transfer rate beyond a 4G communication system, such as LTE. A method by a base station in a communication system according to an embodiment may include: determining the number of DFT-precoding chunks on which DFT precoding is performed; determining a power backoff value of a power amplifier (PA) of the base station; transmitting information indicating the number of DFT-precoding chunks to a terminal; transmitting downlink control information (DCI) including a resource allocation field, configured based on the number of DFT-precoding chunks, to the terminal; and transmitting data to the terminal according to the resource allocation field included in the DCI.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control signaling identifying a configuration for a reference signal comprising a single carrier waveform and associated with single carrier signals for a plurality of symbol periods, the configuration indicating a plurality of channels associated with the reference signal and a set of functions associated with the reference signal. The UE may receive, according to the configuration, the reference signal in a first one or more symbol periods of the plurality of symbol periods and the single carrier signals on the plurality of channels in a second one or more symbol periods of the plurality of symbol periods. The UE may perform the set of functions on the received single carrier signals based at least in part on the received reference signal.

A terminal transmits and receives a slot configured with a plurality of symbols. The terminal sets a length of a cyclic prefix added to each symbol based on a degree of compression of each symbol in time domain.

A method for reducing a peak to average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal. A first signal in the frequency domain is processed to generate a second signal by performing a modular permutation on the first signal according to a modular permutation index, and/or by performing a cyclic shift on the first signal according to a cyclic shift parameter. The second signal is then mapped to a number of tones, and transformed into a time-domain signal for transmission. The modular permutation index and/or the cyclic shift parameter are selected so that the signal for transmission has a PAPR that satisfies a predefined PAPR criteria.

An apparatus for communication in a wireless communication network comprises a coder that encodes a set of data symbols to produce a set of coded symbols; a modulator that modulates the coded symbols onto a set of subcarrier frequencies to generate a time-domain signal comprising a sum of a set of modulated pulse waveforms; and a transmitter configured for transmitting the time-domain signal in the wireless communication network. The coder employs a matrix of spreading codes, wherein each column of the matrix multiplies a different one of the data symbols, which causes the modulator to produce a corresponding one of the set of modulated pulse waveforms. Each column of the matrix of spreading codes comprises a set of linearly increasing phases, which provides a time offset to the corresponding modulated pulse waveforms.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may obtain an indication to switch from a first waveform to a second waveform based at least in part on a condition. The UE may communicate with a base station using the second waveform. Numerous other aspects are described.