A repetition unit (212) performs a repetition for mapping a data signal and a demodulation reference signal (DMRS) repeatedly at a symbol level over a plurality of subframes. A signal allocation unit (213) maps, in the a plurality of subframes, the repeated DMRS to symbols other than symbols corresponding to an SRS resource candidate, which is a candidate for a resource to which a sounding reference signal (SRS) to be used to measure an uplink received signal quality is to be mapped. A transmission unit (216) transmits an uplink signal (PUSCH) including the DMRS and the data signal over the a plurality of subframes.

A system and method of DFT-S-OFDM modulation is provided that uses a set of frequency domain patterns. For a given transmitter, for a set of DFT-S-OFDM symbols, the frequency domain pattern changes according to a time domain hopping pattern. Advantageously, the time domain hopping patterns are defined to allow only a certain amount of overlap, for example for only one DFT-S-OFDM symbol, between any two time domain hopping patterns. This functions to reduce the effect of a collision, when two transmitters use the same frequency pattern, they will do so only for part of the overall transmission. Optionally, frequency domain spectral spreading is used in the transmitter. This can further reduce the PAPR. In the receiver, successive interference cancellation may be employed to reduce the effect of colliding transmissions.

A terminal device (2) according to the present disclosure includes a control unit (203). The control unit (203) acquires, from a base station apparatus (1), information about a signal waveform for use, of a plurality of signal waveforms including a single carrier signal, the signal waveform for use being used for downlink communication with the base station apparatus (1), the information being transmitted by using a predetermined signal waveform of the plurality of signal waveforms. The control unit (203) performs the downlink communication with the base station apparatus (1) by using the signal waveform for use, on the basis of the information.

Provided are a method and apparatus for transmitting data in a wireless communication system. The method, performed by a transmission apparatus, of transmitting data includes performing π/2-binary phase shift keying (BPSK) modulation on M symbols, performing a discrete Fourier transform (DFT) on the M symbols on which the π/2-BPSK modulation has been performed, performing an inverse fast Fourier transform (IFFT) on M/2 symbols among the M symbols on which the DFT has been performed, and transmitting, to a reception apparatus, the M/2 symbols on which the IFFT has been performed, wherein a constellation of the M symbols on which the π/2-BPSK modulation has been performed may have only real components or imaginary components.

The present disclosure relates to a communication technique for merging, with an IoT technology, a 5G communication system for supporting a higher data transmission rate than a 4G system, and a system therefor. The present disclosure can be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security- and safety-related services, and the like) on the basis of a 5G communication technology and an IoT-related technology. A terminal according to an embodiment of the present disclosure can prepare signal processing before receiving a data signal by storing, in a memory, information pre-configured from a base station and reconstruct a signal by sequentially and rapidly processing time symbols in sample units, thereby performing fast signal processing on a single carrier.

A method comprising transmitting, by a first communication node (101), a first communication; receiving, by a relay node (103; 503), the first communication and estimating a first communication channel (H.sub.k; H.sub.k.sup.(1)). Transmitting, by a second communication node (102), a second communication; receiving, by the relay node (103; 503), the second communication; and estimating a second communication channel (G.sub.k, G.sub.k.sup.(1)); generating a first transmission signal (x.sub.k; x.sub.1); transmitting, by the relay node (103; 503), the first transmission signal (x.sub.k; x.sub.1); generating, by the first communication node (101), a first instance of the encryption key (K.sub.A) based on a first received signal (r.sub.A); generating, by the second communication node (102), a second instance of the encryption key (K.sub.B) based on a second received signal (r.sub.B), wherein: the transmission signal (x.sub.k) is generated such that the first received signal (r.sub.A) is equal to the second received signal (r.sub.B).

Methods and apparatus are provided for switching a waveform for UL transmissions in a communication network to optimize power usage of the UE. In exemplary embodiments, the UE can use either CP-OFDM waveform or DFT-S-OFDM waveform for UL transmissions. A mechanism is provided to prevent excessive switching in environments where the channel conditions are rapidly changing Further, a signaling mechanism is provided for switching waveforms for UL transmissions using Layer 1 (L1) signaling to reduce the transmission time needed to switch between CP-OFDM and DFT-S-OFDM waveforms.

Various embodiments relate to a next generation wireless communication system for supporting a higher data transmission rate, etcetera, than a 4.sup.th generation wireless (4G) communication system. Provided in various embodiments are a method for transmitting and receiving a signal in a wireless communication system and an apparatus supporting same, and various other embodiments may be provided.

The present invention relates to a Vehicle-to-X (V2X) communication method performed by a terminal in a wireless communication system. The method comprises: determining priority of information related to the V2X communication; selecting a transmission time interval (TTI) on the basis of the priority; and transmitting the information on the basis of the selected TTI. If the information related to the V2X communication is information having high priority, a first TTI is selected, and if the information related to the V2X communication is information having relatively lower priority than the information having high priority, a second TTI is selected.

Aspects relate to implementing multiplexing with a single carrier waveform. In some examples, a total bandwidth may be divided into a plurality of bandwidth parts (BWPs), each including a plurality of tones. Each of the BWPs may further be divided into two or more interlaces, where each interlace includes a respective number of interleaved tones. A base station may assign each of a plurality of UEs a respective set of one or more interlaces within at least one BWP for multiplexing communication with the base station.