Abstract: A communication method and apparatus. A plurality of signals included in a first sequence to M subcarrier blocks used to transmit a reference signal are mapped, where an mth subcarrier block includes Qm subcarriers, and a plurality of signals mapped to a plurality of consecutive subcarriers at a rear location in the mth subcarrier block are the same as a plurality of signals mapped to a plurality of consecutive subcarriers at a front location in a (mod(m, M)+1)th subcarrier block. Signals transmitted on a plurality of reference signal subcarrier blocks are jointly designed, and a cyclic redundancy characteristic is formed in the plurality of reference signal (for example, PTRS) subcarrier blocks.

Abstract: A method includes a transmitting end sending a first signal that includes a data signal and a reference signal. A first imaginary reference signal in the reference signal is located at a real signal location of the first signal, and/or a first real reference signal in the reference signal is located at an imaginary signal location of the first signal; and the reference signal is used for phase noise estimation.

Abstract: A multi-user communication method includes obtaining first information indicating channel information of a first channel on a first frequency domain resource and second information indicating channel information of a second channel on the first frequency domain resource. The method also includes determining phase precoding information based on the first information and the second information. The first channel and the second channel overlap with each other on the first frequency domain resource. Phases of signals transmitted on symmetric subcarriers of the first channel are opposite. Phases of signals transmitted on symmetric subcarriers of the second channel are opposite. After precoding is performed based on the phase precoding information, channel correlation between an equivalent channel of the second channel and an equivalent channel of the first channel is less than channel correlation between the second channel and the first channel.

Abstract: Embodiments of this application provide a communication method and apparatus. In the method, the first communication apparatus may receive a first message, where the first message includes information about an expansion factor. The first communication apparatus determines a quantity of information bits based on the expansion factor, generates a to-be-sent signal based on the quantity of information bits; and transmits the to-be-sent signal. During communication, the communication apparatus uses the expansion factor in transmission, so that the quantity of information bits transmitted in a filter can be increased, to ensure high spectrum utilization and high data transmission efficiency.

Abstract: Aspects of the present application provide methods and devices for a phase tracking reference (PT-RS) scheme for use by a single carrier Offset QAM (SC-OQAM) transmitter and receiver to estimate, and correct, phase errors that occur over the communication link between the SC-OQAM transmitter and receiver. A transmitter may set the sign (positive or negative) of PT-RS symbols dynamically allowing the transmitter to better utilize IQ interference caused by data symbols and other PT-RS symbols. Another aspect of the present disclosure provides a receiver that can estimate phase error due to phase noise without knowing the sign of PT-RS symbol or the sign of IQ interference. This type of phase error estimation improves the phase noise estimation performance, and thus may improve the overall block error rate (BLER) performance at the receiver.

Abstract: Systems and methods of the present disclosure generally relate to a partitioned stator. The stator includes a plurality of partitioned iron cores that are identical in shape and connected to each other. Windings are wrapped around the partitioned iron cores. Each partitioned iron core includes a yoke and a tooth. End-face enlargements are symmetrically arranged on two end-faces of the yoke. The yoke is of an arc-shaped structure, and the end-face enlargements extend in a radial direction of the arc-shaped structure.