A base station may include one or more processors to receive repetitive data transmitted using a set of subcarriers of a physical resource block (PRB); apply a first orthogonal pattern, assigned to a first user equipment (UE), to a segment of subframes of the received repetitive data; apply a second orthogonal pattern, assigned to a second UE, to the segment of subframes of the received repetitive data, the second orthogonal pattern being different from the first orthogonal pattern; determine first repetitive data, transmitted by the first UE using the set of subcarriers, based on applying the first orthogonal pattern to the segment of subframes of the received repetitive data; and/or determine second repetitive data, transmitted by the second UE using the set of subcarriers, based on applying the second orthogonal pattern to the segment of subframes of the received repetitive data.

A communication system includes a repetitive orthogonal frequency-division multiplexing (ROFDM) transmitter communicating with an ROFDM receiver. The ROFDM transmitter includes an ROFDM modulator, which includes a K-point Fast Fourier Transform receiving a block of time-domain data symbols and generating an initial orthogonal frequency-division multiplexing symbol. The initial orthogonal frequency-division multiplexing symbol is based on a block of frequency-domain data symbols corresponding to the block of time-domain data symbols. The initial orthogonal frequency-division multiplexing symbol includes an ending part. The ROFDM modulator includes an orthogonal frequency-division multiplexing symbol repeater generating a repetitive orthogonal frequency-division multiplexing symbol by repeatedly reproducing the initial orthogonal frequency-division multiplexing symbol. The modulator includes a cyclic prefix adder prepending a cyclic prefix to the repetitive orthogonal frequency-division multiplexing symbol to generate a baseband transmitted signal. The cyclic prefix includes the ending part of the initial orthogonal frequency-division multiplexing symbol. The ROFDM receiver includes an ROFDM demodulator.

There is provided a method for limiting a spurious emission, the method performed by a user equipment (UE) and comprising: configuring a transceiver of the UE to use an operating band 71; and determining at least one operating band to be protected among a plurality of operating band, wherein if the determined operating band to be protected is an operating band 29, a maximum level of spurious emission is limited to 38 dBm for protecting other UE using the operating band 29.

A communication system includes a repetitive orthogonal frequency-division multiplexing (ROFDM) transmitter communicating with an ROFDM receiver. The ROFDM transmitter includes an ROFDM modulator, which includes a K-point Fast Fourier Transform receiving a block of time-domain data symbols and generating an initial orthogonal frequency-division multiplexing symbol. The initial orthogonal frequency-division multiplexing symbol is based on a block of frequency-domain data symbols corresponding to the block of time-domain data symbols. The initial orthogonal frequency-division multiplexing symbol includes an ending part. The ROFDM modulator includes an orthogonal frequency-division multiplexing symbol repeater generating a repetitive orthogonal frequency-division multiplexing symbol by repeatedly reproducing the initial orthogonal frequency-division multiplexing symbol. The modulator includes a cyclic prefix adder prepending a cyclic prefix to the repetitive orthogonal frequency-division multiplexing symbol to generate a baseband transmitted signal. The cyclic prefix includes the ending part of the initial orthogonal frequency-division multiplexing symbol. The ROFDM receiver includes an ROFDM demodulator.

A wireless telecommunications system that mitigates infrasymbol interference due to Doppler-shift and multipath and enables multiple access in one radio channel. Embodiments of the present invention are particularly advantageous for wireless telecommunications systems that operate in high-mobility environments, including high-speed trains and airplanes.

The present disclosure relates to a method for controlling the power of a terminal in device-to-device (D2D) communication and, particularly, to a device and a method for supporting Type 1 discovery or Mode 2 D2D communication. The present disclosure relates to a method for controlling the transmission power of a terminal performing D2D communication, and the terminal, the method comprising the steps of: selecting an arbitrary resource in a discovery period for D2D resource selection; determining whether the selected resource satisfies a preset transmission power control condition; and transmitting information for the D2D communication through the selected resource, by using the power determined according to the determination result. The present disclosure relates to a communication scheme for fusing IoT technology with a 5G communication system for supporting a data rate higher than that of a 4G system and subsequent systems thereafter. The present disclosure can be applied to intelligent services (for example, a smart home, a smart building, a smart city, a smart or connected car, healthcare, digital education, retail business, security and safety related services, and the like) on the basis of the 5G communication technology and IoT related technology.

A transmission method is provided for a communication system in which communications using a plurality of communication methods having different transmission parameters are performed at the same frequency (in frequency bands that at least partially overlap with each other). The transmission method includes: generating a first symbol group that includes a control symbol for causing a communication partner apparatus to recognize that communication using a first communication method is to be performed and a second symbol group that includes a data symbol for the first communication method; transmitting the first symbol group at a first transmit power; and transmitting the second symbol group at a second transmit power that is smaller than the first transmit power.

Interleaving aspects in the case of Signal Space Diversity (SSD) are considered here, in particular when the SSD transmission is expected to be overlapped by a colliding non-orthogonal Ultra Reliable & Low Latency Communication (URLLC). The interleaver's depth when interleaving I and Q components of a rotated modulated symbol is chosen such that a gap of at least an expected maximum size, measured in transmission units, of a possible colliding wireless signal, is generated between a respective In and Qn component of a same symbol n.

A data alignment method capable of preventing degradation in demodulation performance due to variation in signal qualities when a data signal to which a Turbo code is applied is transmitted simultaneously from a plurality of cells. The method divides signal components to be used for data alignment into resources common to all the cells and resources dependent on the cells and transmits encoded and rate-matched data with the first half thereof aligned to the resources common to all the cells and the second half thereof aligned to the resources dependent on the cells.

A transmitting apparatus includes a first signal generating unit that generates, on the basis of data a first signal transmitted by single carrier block transmission; a second signal generating unit that generates, on the basis of an RS, a second signal transmitted by orthogonal frequency division multiplex transmission; a switching operator that selects and outputs the second signal in a first transmission period and selects and outputs the first signal in a second transmission period; an antenna that transmits the signal output from the switching operator; and a control-signal generating unit that controls the second signal generating unit such that, in the first transmission period, the RS is arranged in a frequency band allocated for transmission of the RS from the transmitting apparatus among frequency bands usable in OFDM.