Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may generate multiple orthogonal demodulation reference signal (DMRS) sequences associated with multiple orthogonal DMRS ports based at least in part on a pi/2 binary phase shift keying (BPSK) based DMRS base sequence and based at least in part on utilizing at least one of a frequency-domain comb structure or a time-domain orthogonal cover code (OCC), wherein the multiple orthogonal DMRS ports are associated with different UEs; determine a DMRS port, of the multiple orthogonal DMRS ports, to be used in association with a transmission of pi/2 BPSK modulated data; and transmit the pi/2 BPSK modulated data and a DMRS sequence, of the multiple orthogonal DMRS sequences, associated with the DMRS port. Numerous other aspects are provided.

A communication circuit supports a first communication protocol and a second communication protocol that is different from the first communication protocol. A number of signals include first signals conveying first information messages and second signals conveying second information messages. The first information messages include a repetitive message having fixed repeated content and the second information messages include a non-repetitive message having variable content. The first signals and the second signals are transmitted via the communication circuit using the first communication protocol for the first signals and the second communication protocol for the second signals.

A method for mapping, by a base station, a channel state information (CSI)-reference signal (RS) in a wireless communication system, includes mapping the CSI-RS, for at least one antenna port, to at least one pair of resource elements (REs) per physical resource block (PRB) pair in consecutive orthogonal frequency division multiplexing (OFDM) symbols in a subframe, wherein the subframe includes two slots, and each slot includes six OFDM symbols based on an extended cyclic prefix (CP), and transmitting the CSI-RS to a user equipment (UE) via the at least one antenna port in the subframe.

A repeater generates repetition signals by repeating an uplink signal over a plurality of subframes. If the plurality of subframes do not include a transmission candidate subframe of a sounding reference signal used to measure uplink reception quality, a controller sets a first transmission format to all the plurality of subframes, and if the plurality of subframes include the transmission candidate subframe, the controller sets a second transmission format to all the plurality of subframes. A transmitter transmits the repetition signals using the set transmission format.

A wireless transmission device includes a repetition coding unit that prepares a basic waveform having a length less than a frequency conversion length that is used in a wireless reception device, generates a repetition waveform having a length greater than or equal to the frequency conversion length by repeating the basic waveform a plurality of times, and generates a data frame including the repetition waveform and a known signal.

A communication circuit supports a first communication protocol and a second communication protocol that is different from the first communication protocol. A number of signals include first signals conveying first information messages and second signals conveying second information messages. The first information messages include a repetitive message having fixed repeated content and the second information messages include a non-repetitive message having variable content. The first signals and the second signals are transmitted via the communication circuit using the first communication protocol for the first signals and the second communication protocol for the second signals.

A repeater generates repetition signals by repeating an uplink signal over a plurality of subframes. If the plurality of subframes do not include a transmission candidate subframe of a sounding reference signal used to measure uplink reception quality, a controller sets a first transmission format to all the plurality of subframes, and if the plurality of subframes include the transmission candidate subframe, the controller sets a second transmission format to all the plurality of subframes. A transmitter transmits the repetition signals using the set transmission format.

A method (700) includes receiving (701) a receive signal (x[n]) comprising a periodic data signal component (r[n]) and a periodic interference signal component (s[n]); determining (702) an average value by averaging over sub-samples of the receive signal (x[n]), wherein the average value is independent of at least one sub-sample of the receive signal (x[n]) having a same phase as a particular sample ([n]) of the receive signal (x[n]); and determining (703) for the particular sample ([n]) of the receive signal (x[n]) an estimate ([n]) of the interference signal component (s[n]) based on the average value.

A repeater generates repetition signals by repeating an uplink signal over a plurality of subframes. If the plurality of subframes do not include a transmission candidate subframe of a sounding reference signal used to measure uplink reception quality, a controller sets a first transmission format to all the plurality of subframes, and if the plurality of subframes include the transmission candidate subframe, the controller sets a second transmission format to all the plurality of subframes. A transmitter transmits the repetition signals using the set transmission format.

A bit-level operation may be implemented prior to modulation and resource element (RE) mapping in order to generate a NoMA transmission using standard (QAM, QPSK, BPSK, etc.) modulators. In this way, the bit-level operation is exploited to achieve the benefits of NoMA (e.g., improved spectral efficiency, reduced overhead, etc.) at significantly less signal processing and hardware implementation complexity. The bit-level operation is specifically designed to produce an output bit-stream that is longer than the input bit-stream, and that includes output bit-values that are computed as a function of the input bit-values such that when the output bit-stream is subjected to modulation (e.g., m-ary QAM, QPSK, BPSK), the resulting symbols emulate a spreading operation that would otherwise have been generated from the input bit-stream, either by a NoMA-specific modulator or by a symbol-domain spreading operation.