An extensible communication system is described herein. The system includes a first module for receiving a root index value and for generating a constant amplitude zero auto-correlation sequence based on the root value. The system further includes a second module for receiving a seed value and for generating a Pseudo-Noise sequence based on the seed value. The system further includes a third module for modulating the constant amplitude zero auto-correlation sequence by the Pseudo-Noise sequence and for generating a complex sequence. The system further includes a fourth module for translating the complex sequence to a time domain sequence, wherein the fourth module applies a cyclic shift to the time domain sequence to obtain a shifted time domain sequence.

This application discloses a synchronization signal sending method and a related device. The method includes: generating, a first synchronization signal sequence and a second synchronization signal sequence, where the first synchronization signal sequence is a sequence obtained based on a first m-sequence, the second synchronization signal sequence is a sequence obtained based on a Gold sequence, the Gold sequence is generated based on a second m-sequence and a third m-sequence, and a generator polynomial of the first m-sequence is the same as a generator polynomial of the second m-sequence; mapping, the first synchronization signal sequence onto M subcarriers in a first time unit to obtain a first synchronization signal, and mapping the second synchronization signal sequence onto M subcarriers in a second time unit to obtain a second synchronization signal, where M and N are positive integers greater than 1.

A method for selecting orthogonal cover codes repetition sequence for Physical Uplink Control Channel (PUCCH) transmission in a New Radio-Unlicensed (NR-U) network is provided. In embodiments disclosed herein, a set of time domain and/or frequency domain variables, , is first determined to be used in a function, (), that determines a selected PUCCH sequence, r.sub.l(m), among at least two PUCCH sequences to be repeated with Orthogonal Cover Codes (OCC). Accordingly, a subset of the selected PUCCH sequence, r.sub.l(m), is repeated with OCC. By employing the method disclosed herein to determine the selected PUCCH sequence, r.sub.l(m), for repetition with OCC, it is possible to satisfy the occupied bandwidth and the maximum Power Spectral Density (PSD) requirements mandated in the NR-U network.

A receiver that is a communication apparatus includes a plurality of receiving antennas that receives, as reception signals, interference signals and desired signals transmitted by a transmitting apparatus that performs sequence multiplication processing at the time of transmission, and an interference suppressor that generates, for each of the receiving antennas, a weight used when combining the reception signals received by the respective receiving antennas, and performs inter-antenna combining that is combining of the reception signals, using the weights, to perform interference suppression on the reception signals. The interference suppressor performs reverse sequence multiplication processing on the reception signals to vary interference forms in the reception signals, generates the weights differently for different combinations of the reception signals on which to perform the interference suppression, and performs the interference suppression using, from among the generated weights, the weights by which the desired signals strengthen each other.