Huawei Technologies Co., Limited

Ganghua Yang

Hongqiang Bao

Yi Bin Wang

Maosheng Huang

Yong Gen He

Yi Yuan

Hufei Zhu

Tengyue Li

Tao Tang

Ramin Khayatzadeh

Shengjun Ou

Zhipeng Zhao

Yonghui Peng

Zhunjiang Shi

Wei Zhang

Jian Li

Chenghui Peng

Wenliang Liang

Jian Ou

Yungang Li

Huijian Zhang

Enbo Wang

Wenyuan Yong

Liang Zhuang

A MIMO system comprises a remote radio unit (RRU) and central unit. The RRU comprises: a binary phase shift keying (BPSK) modulator, configured to modulate a BPSK waveform by a local oscillator (LO) signal to generate a stimulus signal, wherein the LO signal is derived from a downlink optical signal received via downlink radio over fiber (DL-ROF) from a central unit (CU); and an optical signal generator, in particular a laser, configured to generate an uplink optical signal based on the stimulus signal for transmission via uplink radio over fiber (UL-ROF) to the CU.

Remote radio unit and central unit for multiple-input multiple-output system

A remote radio unit is for a base transceiver station. The remote radio unit includes: a noise generator configured to provide a RF noise signal having predefined statistical properties; a communication interface configured to transmit the RF noise signal as a stimulus signal over a radio-over-fiber uplink channel between the remote radio unit and a central unit of the base transceiver station for determining a pre-distortion of a target signal to be transmitted by the remote radio unit. The communication interface is further configured to receive the pre-distorted target signal over a ROF downlink channel between the remote radio unit and the central unit of the base transceiver station. The remote radio unit also has an antenna for transmitting the pre-distorted target signal received by the communication interface.

Remote radio unit and a central unit for a base transceiver station

Embodiments of the present invention provide a signal processing method and apparatus. The method includes: performing M-way filtering on an input signal to obtain M filtered signals, performing extraction on M filtered signals separately to obtain M extracted signals, performing fast Fourier transform (FFT) on the M extracted signals separately to obtain M frequency-domain signals, and finally determining output signals according to the M frequency-domain signals. According to the embodiments of the present invention, signal filtering and extraction are performed and then FFT is performed.

Signal processing method and apparatus

The present disclosure discloses a method, an apparatus, a device, and a system for antenna alignment. The method includes: performing, according to a target preset condition, adjustment processing on a phase and an amplitude of a signal that is transmitted by each antenna unit of a first antenna, and the second antenna is located within a coverage scope of the target beam; and determining that a difference between a horizontal angle of the target beam and a mechanical horizontal angle of a current mechanical location of the first antenna is a horizontal angle, that needs to be adjusted, of the first antenna, adjusting the mechanical horizontal angle and the mechanical pitch angle of the first antenna according to the horizontal angle that needs to be adjusted and the pitch angle that needs to be adjusted.

Method, apparatus, device, and system for antenna alignment

Embodiments of the present invention disclose a data transmission method and a related apparatus, which are used to implement compression of data transmitted on a backhaul to increase throughput of the backhaul. The method in the embodiments of the present invention includes: parsing a received Internet Protocol (IP) data packet to obtain a transmission network protocol header, a transmission tunneling protocol header, a user data protocol header, and user application layer data; compressing the transmission tunneling protocol header, the user data protocol header, and the user application layer data to obtain a compressed transmission network protocol payload; using the transmission network protocol header to encapsulate the compressed transmission network protocol payload to obtain a compressed IP data packet; and sending the compressed IP data packet to a decoding device in a core network or in a base station.

Data transmission method and related apparatus to compress data to be transmitted on a network

A method for returning a base station signal and a base station for implementing the method. The base station includes a first return unit located in a radio frequency system and a second return unit located in a baseband processing system. The first return unit is configured to perform analog modulation on an uplink analog signal of a first bandwidth to obtain an uplink analog signal of a second bandwidth, and send the uplink analog signal of the second bandwidth to the second return unit, where the second bandwidth is larger than the first bandwidth. The second return unit is configured to receive the uplink analog signal of the second bandwidth, demodulate the uplink analog signal of the second bandwidth to obtain the uplink analog signal of the first bandwidth.

Base station, and method and device for returning signal

Embodiments of the present disclosure disclose a wireless transceiver. The wireless transceiver includes a second control switch, and the second control switch may selectively connect a signal output end of a coupler or a signal output end of a low noise amplifier LNA to a signal input end of the down converter. Therefore, when the signal output end of the coupler is connected to the down converter, the coupler, the down converter, and the analog-to-digital converter ADC form an observer; when the second control switch connects the signal output end of the low noise amplifier LNA to the signal input end of the down converter, a transceiver antenna, the low noise amplifier LNA, the down converter, and the analog-to-digital converter ADC form a receiver. Therefore, the embodiments of the present disclosure can greatly save hardware costs of a system for implementing an observer circuit.

Wireless transceiver

The present invention discloses a radio base station and a method for clock synchronization of the radio base station. The radio base station may include a base station outdoor apparatus including an adapter, a ground service antenna, and a satellite antenna. A base station indoor apparatus includes a satellite signal processing module configured to perform decoding processing on a satellite radio frequency signal received by the satellite antenna to obtain a satellite service signal. The satellite antenna and the ground service antenna are connected to the adapter. The adapter is configured to couple the signals received by the satellite antenna and ground service antenna, and transmit a coupled signal to the base station indoor apparatus through a first data cable.

Base station and method for clock synchronization of base station

The present invention provides a synchronization method of user equipment and user equipment, where the method includes: when the user equipment accesses a millimeter-wave band network, performing first synchronization in a cellular band by using a cellular band network that covers the millimeter-wave band network; and performing second synchronization in a millimeter-wave band by using the millimeter-wave band network. In the present invention, after the first synchronization in the cellular band is performed, the second synchronization in the millimeter-wave band is performed by using the millimeter-wave band network, which avoids a case in which the user equipment acquires a PSS in a PSS synchronization window that slides in the millimeter-wave band for a long time, thereby reducing overheads, narrowing a range of the synchronization window, and accelerating detection of a PSS in the millimeter-wave band, so that the user equipment quickly and accurately performs synchronization in the millimeter-wave band.

Synchronization method of user equipment and user equipment

An OFDM signal modulation method based on compressed sensing is provided, the method includes: acquiring a demodulation parameter of a receiver, where the demodulation parameter includes Tof a periodic square signal of the receiver in sampling, Tis a length of a minimum timeslot during which the periodic square signal maintains a high level or a low level; performing an OFDM modulation on an inputted information symbol to generate an OFDM baseband signal, and controlling a sampling interval T=T/k of the OFDM baseband signal to be integral multiple of T, where Tis a duration of valid data in the OFDM baseband signal, and k is the number of sub-carriers in the OFDM baseband signal; and up-converting the OFDM baseband signal and transmitting the processed signal to the receiver. Also provided are a demodulation method, device and system.

OFDM signal modulation-demodulation method, device and system based on compressed sensing

A method includes determining a correlation between a first residual error and multiple columns in a sensing matrix according to a measured value of an original signal and the sensing matrix, and determining a first array most correlative to the measured value of the original signal in the sensing matrix according to the correlation between the first residual error and the multiple columns; determining a correlation between a kresidual error and the multiple columns according to a correlation between a (k&#x2212;1)residual error and the multiple columns, and determining a karray most correlative to the measured value of the original signal according to the correlation between the kresidual error and the multiple columns in the sensing matrix, where 2&#x2266;k&#x2266;K; and recovering the original signal after determining a Karray most correlative to the measured value of the original signal.

Signal reconstruction method and apparatus

A radio frequency unit and an integrated antenna are provided. The radio frequency unit includes a duplexer, a power amplifier circuit board, and a transceiver circuit board. The duplexer connects to the power amplifier circuit board and the transceiver circuit board. The power amplifier circuit board connects to the transceiver circuit board. The power amplifier circuit board and the transceiver circuit board are respectively located at two end portions of the duplexer. The power amplifier circuit board and the transceiver circuit board are projected onto the same plane along a direction being vertical to the power amplifier circuit board with their projections on the same plane non-overlapped each other.

Growing community of inventors

Boulogne Billancourt, France

Ganghua Yang