Abstract: An antenna detection method, an apparatus, a device, and a storage medium are disclosed. The method includes: A first terminal device sends a first detection signal to a network device. The first detection signal is used to determine at least one first antenna sub-array corresponding to the first terminal device. A plurality of antenna sub-arrays of the network device includes the at least one first antenna sub-array. A time interval at which the first detection signal is sent is related to spatial non-stationary coherence time. The first terminal device obtains first information from the network device. The first information indicates to perform information transmission through the at least one first antenna sub-array corresponding to the first terminal device.

Abstract: A first terminal receives first information from a network device, and determines, based on the first information, a pilot used by the first terminal. The first terminal is a terminal in NU terminals, the first information is determined based on a joint matrix, the joint matrix includes transmit/receive full-dimensional statistical information of channels between the NU terminals and the network device, and the joint matrix is for determining pilots of the NU terminals.

Abstract: A reference signal sending method includes obtaining a frequency-domain cyclic shift factor and a time-domain cyclic shift factor, wherein the frequency-domain cyclic shift factor and the time-domain cyclic shift factor are useable to perform phase rotation on a reference signal sequence. A reference signal sending method further includes generating a second reference signal sequence based on a first reference signal sequence, the frequency-domain cyclic shift factor, and the time-domain cyclic shift factor. A reference signal sending method further includes sending the second reference signal sequence on an antenna port p, wherein p is an element in a set {0, 1, . . . , P?1}, and P is an integer greater than or equal to 1.

Abstract: This application provides communication methods and communications apparatuses. In an example method, a first communications apparatus determines whether a first channel learning model is applicable, where the first channel learning model is used to determine first channel information based on target channel information, and a data amount of the first channel information is less than a data amount of the target channel information. The first communications apparatus sends a first message in response to determining that the first channel learning model is not applicable, where the first message is used to indicate that the first channel learning model is not applicable. According to the example method, the first communications apparatus can determine applicability of the first channel learning model without assistance of a second communications apparatus.

Abstract: A method and an apparatus for measuring a frame error rate, reducing duration of measuring the frame error rate. A first device obtains an error frame, obtains channel information and/or interference information corresponding to the error frame, and determines a frame error rate based on the channel information and/or the interference information corresponding to the error frame. The method for determining the frame error rate based on the channel information and/or the interference information corresponding to the error frame can reduce a quantity of transmitted test frames. For example, a total quantity of frames needs to be only 1% or even less of a total quantity of frames required for a current MC method. Therefore, the measurement duration can be reduced, and measurement efficiency can be improved.

Abstract: This application provides a signal generation method and an apparatus. In the method, a first communication apparatus generates a first signal, and sends the first signal to a second communication apparatus, who receives the first signal, and then demodulates the first signal. A symbol included in the first signal is carried on K+2(M?1) subcarriers. Middle K subcarriers are valid subcarriers, start M?1 subcarriers and last M?1 subcarriers are redundant subcarriers, and a subcarrier spacing between adjacent subcarriers is related to a feature of a time domain pulse used to shape the subcarrier, wherein a width of each of some or all side lobes of a spectrum of the time domain pulse is equal to 1/M of a main lobe width of the time domain pulse, the subcarrier spacing is 1/M of the main lobe width. K is a positive integer, and M is a positive integer greater than 1.

Abstract: This application provides a communication method and apparatus, and relates to the field of communication technologies. In the method, a first communication apparatus determines a first index indicating a first precoding vector, and sends the first index to a second communication apparatus. The second communication apparatus receives the first index from the first communication apparatus, determines the first precoding vector based on the first index, and precodes data based on the first precoding vector. The first precoding vector includes spatial angle information and spatial depth information of a channel between the first communication apparatus and the second communication apparatus.

Abstract: A channel characteristic obtaining method includes generating, by a first communication apparatus, a first reference signal and a first notification message, sending, by the first communication apparatus, the first reference signal and the first notification message to a second communication apparatus, and receiving, by the first communication apparatus, channel characteristic information of a first channel type from the second communication apparatus. The first channel type corresponds to first channel state information (CSI) determined by the second communication apparatus based on the first reference signal. The first notification message is useable to request the channel characteristic information of the first channel type. A channel characteristic of the first channel type is from a channel characteristic library. The channel characteristic library comprises channel characteristics of one or more channel types.

Abstract: This application provides a signal generation method and an apparatus. In the method, a first communication apparatus generates a first signal, and sends the first signal to a second communication apparatus, who receives the first signal, and then demodulates the first signal. A symbol included in the first signal is carried on K+2(M?1) subcarriers. Middle K subcarriers are valid subcarriers, start M?1 subcarriers and last M?1 subcarriers are redundant subcarriers, and a subcarrier spacing between adjacent subcarriers is related to a feature of a time domain pulse used to shape the subcarrier, wherein a width of each of some or all side lobes of a spectrum of the time domain pulse is equal to 1/M of a main lobe width of the time domain pulse, the subcarrier spacing is 1/M of the main lobe width. K is a positive integer, and M is a positive integer greater than 1.

Abstract: This application provides an antenna detection method, an apparatus, a device, and a storage medium. The method includes: A first terminal device sends a first detection signal to a network device. The first detection signal is used to determine at least one first antenna sub-array corresponding to the first terminal device. A plurality of antenna sub-arrays of the network device include the at least one first antenna sub-array. A time interval at which the first detection signal is sent is related to spatial non-stationary coherence time. The first terminal device obtains first information from the network device. The first information indicates to perform information transmission through the at least one first antenna sub-array corresponding to the first terminal device.

Abstract: A first terminal receives first information from a network device, and determines, based on the first information, a pilot used by the first terminal. The first terminal is a terminal in NU terminals, the first information is determined based on a joint matrix, the joint matrix includes transmit/receive full-dimensional statistical information of channels between the NU terminals and the network device, and the joint matrix is for determining pilots of the NU terminals.

Abstract: A channel state information processing method and a communication apparatus.

Abstract: A communication method, device, and system belong to the field of communication technologies. A first device may determine a frame structure and perform communication based on the frame structure, so that the first device may receive, in a receiving time unit, a setting instruction indicating a first state, and reflect a signal based on the first state in a reflection time unit.

Abstract: This application provides a signal generation method and an apparatus. In the method, a first communication apparatus generates a first signal, and sends the first signal to a second communication apparatus, who receives the first signal, and then demodulates the first signal. A symbol included in the first signal is carried on K+2(M?1) subcarriers. Middle K subcarriers are valid subcarriers, start M?1 subcarriers and last M?1 subcarriers are redundant subcarriers, and a subcarrier spacing between adjacent subcarriers is related to a feature of a time domain pulse used to shape the subcarrier, wherein a width of each of some or all side lobes of a spectrum of the time domain pulse is equal to 1/M of a main lobe width of the time domain pulse, the subcarrier spacing is 1/M of the main lobe width. K is a positive integer, and M is a positive integer greater than 1.

Abstract: This application provides communication methods and communications apparatuses. In an example method, a first communications apparatus determines whether a first channel learning model is applicable, where the first channel learning model is used to determine first channel information based on target channel information, and a data amount of the first channel information is less than a data amount of the target channel information. The first communications apparatus sends a first message in response to determining that determining that the first channel learning model is not applicable, where the first message is used to indicate that the first channel learning model is not applicable. According to the example method, the first communications apparatus can determine applicability of the first channel learning model without assistance of a second communications apparatus.

Abstract: This application provides a reference signal sending method and a communication apparatus. In the method, a time-domain cyclic shift factor is introduced, and phase rotation is performed on a first reference signal sequence jointly by using a frequency-domain cyclic shift factor and the time-domain cyclic shift factor, to obtain the second reference signal sequence. Because the time-domain cyclic shift factor is introduced, different transmit ends have at least one of different values of the frequency-domain cyclic shift factor and different values of the time-domain cyclic shift factor, that is, orthogonal multiplexing of second reference signal sequences of different transmit ends can be implemented, so that a capacity of second reference signal sequences is increased.

Abstract: This application provides a communication method and apparatus, and relates to the field of communication technologies. In the method, a first communication apparatus determines a first index indicating a first precoding vector, and sends the first index to a second communication apparatus. The second communication apparatus receives the first index from the first communication apparatus, determines the first precoding vector based on the first index, and precodes data based on the first precoding vector. The first precoding vector includes spatial angle information and spatial depth information of a channel between the first communication apparatus and the second communication apparatus.

Abstract: A number K of N sub-channels that are defined by a code and that have associated reliabilities for input bits at N input bit positions, are to be selected to carry bits that are to be encoded. A localization area that includes multiple sub-channels and is located below fewer than K of the N sub-channels in a partial order of the N sub-channels is determined based on one or more coding parameters. The fewer than K sub-channels of the N sub-channels above the localization area in the partial order are selected, and a number of sub-channels from those in the localization area are also selected. The selected fewer than K sub-channels and the number of sub-channels selected from those in the localization area together include K sub-channels to carry the bits that are to be encoded.

Abstract: A number K of N sub-channels that are defined by a code and that have associated reliabilities for input bits at N input bit positions, are to be selected to carry bits that are to be encoded. A localization area that includes multiple sub-channels and is located below fewer than K of the N sub-channels in a partial order of the N sub-channels is determined based on one or more coding parameters. The fewer than K sub-channels of the N sub-channels above the localization area in the partial order are selected, and a number of sub-channels from those in the localization area are also selected. The selected fewer than K sub-channels and the number of sub-channels selected from those in the localization area together include K sub-channels to carry the bits that are to be encoded.

Abstract: Encoding of information bit sequences by use of an encoding device having more than two encoding entities is provided. Decoding of output codewords by a decoding device having more than two decoding entities is further provided. The encoding and the decoding are implemented through transmitting output codewords, generated by the encoding device, to the decoding device via a channel, wherein two or more user devices transmit the respective output codewords concurrently via the channel.