A method by which a terminal performs a multi-dimensional modulation (MM)-based non-orthogonal multiple access (NOMA) communication can comprise the steps of: receiving, from a base station, control information indicating a terminal specific codebook for a terminal in a predefined codebook set for an MM-based encoder; and receiving a downlink data channel from the base station on the basis of the indicated terminal specific codebook, or performing MM-based encoding on the basis of the indicated terminal specific codebook and then transmitting an uplink data channel.

The present disclosure discloses a method and a system for providing a code cover to Orthogonal Frequency Division Multiplexing (OFDM) symbols in a multiple user system. A data sequence is received from each of a plurality of users. Further, a reference sequence is generated for the data sequence of each of the plurality of users. Each of the reference sequence is multiplied with a code cover which are orthogonal to each other. Each of the reference sequence is time-multiplexed with corresponding data sequence, to generate a corresponding multiplexed sequence. Further, a Discrete Fourier Transform (DFT) is performed on each of the multiplexed sequence to generate a corresponding DFT-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) symbol. Lastly, the corresponding DFT-s-OFDM symbol is processed for transmitting over corresponding one or more channels.

A multi-user access node for receiving concurrent signals which are carrying redundant chip sequences at a baseband rate, the access node including: a plurality of antennas organized in an antenna configuration; a main transceiver comprising an analog receiver and an ADC for converting an incoming signal into a digital signal which comprises the incoming chip sequences; a switch for switching the transceiver between the plurality of antennas; a controller configured for: initializing the multi-user access node by switching the transceiver between the plurality of antennas to capture a spatial character of the different users based on unique initialization chip sequences from the different users, separating collided chip sequences transmitted by different users by switching the transceiver between the plurality of antennas according to a scrambling sequence and by using the spatial character in combination with the applied scrambling sequence.

Methods, systems, and devices for wireless communications are described that provide sequences of spreading codes and hopping patterns that may be used in non-orthogonal multiple access (NOMA) communications between a user equipment (UE) and a base station. A codebook of spreading codes and the associated hopping patterns may be systematically constructed by closed form formulas or look up table. The base station may receive multiple concurrent transmissions from multiple different UEs, and the sequences of spreading codes and hopping patterns, may be used to identify a particular UE of the multiple UEs.

A communication device (20) includes a processing unit (232) that performs a NOMA transmission process on a partial range of transmission data to be transmitted to another communication device (40), the NOMA transmission process being signal processing for non-orthogonal multiple access, and a transmitting unit (235) that transmits data obtained after the NOMA transmission process to the another communication device.

There is provided a method for exchanging spatial information of signals received from a User Equipment (UE) between a radio unit and a baseband unit. The method comprises: determining a channel estimate based on signals received from a User Equipment (UE); selecting a spatial transformation to be applied to the received signals, based on the channel estimate; and sending a set of signals transformed by the selected transformation to a baseband unit. A radio unit for implementing this method is also provided.

A multi-user access node for receiving concurrent signals which are carrying redundant chip sequences at a baseband rate, the access node including: a plurality of antennas organized in an antenna configuration; a main transceiver comprising an analog receiver and an ADC for converting an incoming signal into a digital signal which comprises the incoming chip sequences; a switch for switching the transceiver between the plurality of antennas; a controller configured for: initializing the multi-user access node by switching the transceiver between the plurality of antennas to capture a spatial character of the different users based on unique initialization chip sequences from the different users, separating collided chip sequences transmitted by different users by switching the transceiver between the plurality of antennas according to a scrambling sequence and by using the spatial character in combination with the applied scrambling sequence.

An apparatus comprising: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform: receiving at least one signal comprising control information; determining data to transmit using grant-free data transmission; determining whether grant-free data transmission using time-frequency repetition is permitted for the grant-free data transmission in dependence on the received control information; if it is determined that use of time-frequency repetition for the grant-free data transmission is permitted, causing transmission of grant-free data transmission using time-frequency repetition; and if it is determined that use of time-frequency repetition for the grant-free data transmission is not permitted, causing transmission of grant-free data transmission without using time-frequency repetition.

Embodiments of the invention are directed to a cellular communication network that can determine whether communications between one base station-UE pair may interfere with another UE that is in the same cell or a different cell. The network identifies interference parameters associated with interference signals that may be received by a UE. The interference signals may be generated by the base station itself, such as communications with other UEs, or by a neighboring base station. The base station transmits the interference parameters to the UE. The UE receives the one or more parameters comprising information about signals expected to cause intra-cell or inter-cell interference. The UE then processes received signals using the one or more parameters to suppress the intra-cell or inter-cell interference.

The disclosed technology includes techniques for facilitating the operation of a multi-antenna communication system. The disclosed technology can be implemented to provide a method for wireless communications which includes receiving, by a user device, an indication about an association between multiple reference resources and a target resource at the user device. The association includes properties of a communication channel to and/or from the user device, and wherein at least one property of the communication channel is different among the multiple reference resources, and performing wireless communication using the indication.