Huawei Technologies Co., Limited

Shenzhen Addx Innovation Technology Co., Ltd.

Southwest Jiaotong University

Xiaohu Tang

Li Pu

Yang Yang

Min Yan

Xianfu Lei

Xiaolu Sun

Bin Yu

Qian Wang

Wei Lin

Ming Gan

Jian Ding

Yalin Liu

Yong Qing Wang

Ting Xu

Wei Bin Lin

Jun Zhu

Dandan Liang

Chenchen Liu

Rui Ni

Xingchi Chen

Yanyan Wang

Zhi Gu

Zhengchun Zhou

Li Li

Qidi Li

Qiuping Yu

Camera

Embodiments of this application provide a method and an apparatus for transmitting a physical layer protocol data unit, to design a short training field sequence for a larger channel bandwidth. The short training field sequence designed in this application has a smaller peak-to-average power ratio PAPR and better performance. The method includes: generating a physical layer protocol data unit PPDU that complies with the 802.11be standard, where the PPDU includes a short training field, and a quantity of subcarriers of a frequency domain sequence of the short training field is greater than 2048; and sending the PPDU on a target channel, where a bandwidth of the target channel is greater than or equal to 160 MHz.

Method and apparatus for transmitting physical layer protocol data unit

Doorbell

Smart battery video doorbell

This application discloses a method including a transmit end that generates and sends a physical layer protocol data unit (PPDU), and a receive end that receives the PPDU and parses the PPDU. An enhanced directional multi-gigabit (EDMG) modulation field in the PPDU includes a channel estimation field (CEF), the CEF includes a CEF sequence, and a length of the CEF sequence is m, where m is determined based on a quantity of bonding channels and a quantity of subcarriers included on a channel. When a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) technology is introduced into a 60 GHz WLAN standard, an applied CEF sequence included in a CEF can be determined, and DFT-S-OFDM transmission is further performed by using the CEF sequence. In this way, a PAPR of a WLAN system can be reduced while frequency division multiplexing for a plurality of users is supported.

Data transmission method and apparatus

An angular domain channel estimation method based on matrix reconstruction for a symmetrical nonuniform array is a combined two-stage channel estimation and channel equalization scheme provided based on an SNLA model. In a first stage, a matrix reconstruction method is used to estimate a path AOA, and compared with traditional channel estimation based on ULA, the matrix reconstruction method achieves a higher resolution ratio. In a second stage, an LS method is used to obtain a path gain. According to the angular domain channel estimation method, a mean square error of channel estimation, a bit error of data transmission and complexity of a traditional scheme are significantly reduced. A simulation result indicates that compared with the traditional method, the angular domain channel estimation method can achieve a lower MSE and BER.

Angular domain channel estimation method based on matrix reconstruction for symmetrical nonuniform array

This application relates to the field of communications technologies, and discloses a data transmission method. The method includes: generating a PPDU; and transmitting the PPDU to at least one receive end. The PPDU includes a channel estimation field CEF, and the CEF includes a plurality of sub-sequences. For each of the plurality of sub-sequences, a part or all of elements in the sub-sequence are basic elements, and the basic elements are arranged into a Golay sequence or a ZC sequence in the sub-sequence. This application is used for data transmission.

Data transmission method, apparatus, and system

Photographic camera

In this application, a manner of generating a modulated field STF is enriched, so that a manner of generating a PPDU is enriched, thereby improving data transmission flexibility. The method includes: After generating a PPDU, a transmit end sends the PPDU to at least one receive end, where the PPDU includes at least one modulated field STF, the modulated field STF includes a plurality of zero elements and a plurality of non-zero elements, m1 zero elements are included before a first non-zero element, m2 zero elements are included after a last non-zero element, m1+m2 zero elements are included between any two adjacent non-zero elements, m1 and m2 both are positive integers, and the modulated field STF is mapped to a plurality of consecutive subcarriers for transmission. This application is used for data transmission.

A network service configuration method and a network management device, where the method includes obtaining, by a network management device, a terminal access port and an access parameter that is configured for the terminal access port and that is of a network service, determining a to-be-configured port according to the access parameter that is configured for the terminal access port and that is of the network service; generating a configuration instruction of the to-be-configured port, and sending the configuration instruction of the to-be-configured port to a to-be-configured network device. Hence, intervention from an administrator is not required, an error probability of network operation and maintenance may be reduced, efficiency of configuring a parameter of the network service is improved, and administrator time is saved.

Network service configuration method and network management device

Embodiments of the present invention provide a signal transmission method and apparatus, which can implement fast initial time synchronization. The method includes: generating, by a transmit-end device, an initial short training sequence, where the initial short training sequence includes M sub-sequences b, and the sub-sequence b includes N transmission sampling points; determining a quantity of reception sampling points used by a receive-end device when the receive-end device performs autocorrelation processing; generating a symbol sequence according to the quantity of the reception sampling points, and generating a target short training sequence according to the symbol sequence and the initial short training sequence; and sending a target signal to the receive-end device, where a short training sequence field of the target signal carries a short training sequence symbol, and the short training sequence symbol is used to indicate the target short training sequence.

Signal transmission method and apparatus

A loop avoidance method, device and system. The system includes a first network device and a second network device in an internal network, a first Ethernet port and a second Ethernet port of the two network devices are of a first type, and loop avoidance priorities of the Ethernet ports are different from each other; root media access control (MAC) addresses of the two network devices are the same, and are different from respective network bridge MAC addresses; the second network device receives a loop detection frame from the first Ethernet port through the second Ethernet port, where a source address of the loop detection frame is the root MAC address, and blocks the second Ethernet port according to the loop avoidance priority. A network device blocks, according to a loop avoidance priority, an Ethernet port connected to an external network to avoid changing a topology of an internal network.

Loop avoidance method, device and system

Growing community of inventors

Chengdu, China

Xiaohu Tang