National University of Defense Technology

Wenxiang Liu

Xinming Huang

Feixue Wang

Sixin Wang

Lei Chen

Ke Zhang

Baiyu Li

Zukun Lu

Zengjun Liu

Guangfu Sun

Zhibin Xiao

Rong Zhou

Jingyuan Li

Hang Gong

Mingzan Xie

Yuchen Xie

Wei Xiao

Pengpeng Li

Zongnan Li

Huan Liu

Shaojie Ni

Xiaomei Tang

Honglei Lin

Pengcheng Ma

Kuo Cao

Muzi Yuan

Zhicheng Lyu

Shuibin Zhong

Xiaozhou Ye

A design method for a satellite navigation signal system with mixed modulation of direct spread spectrum and frequency hopping includes: modulating the spread spectrum code sequence of multipath signal components; mixing and multiplexing with the signal components corresponding to the same frequency point; forming a baseband code sequence; separating signal components corresponding to the baseband code sequence to obtain separated radio frequency signals; recombining and modulating separated radio frequency signals; controlling the frequency hopping pattern by the frequency hopping code sequence if the separated radio frequency signals are authorized signals, and performing mixed frequency synthesis modulation; performing direct combined radio frequency modulation if the separated radio frequency signals are unauthorized signals, and obtaining the recombined signal component; amplifying the signal power to obtain the direct spread spectrum navigation signal.

Designed method for satellite navigation signal system with mixed modulation of direct spread spectrum and frequency hopping

A method and a device for joint suppression of narrowband and multiple access interference are provided. The method includes: performing time domain windowing processing on a received signal, and performing frequency domain interference processing on a signal after windowing processing to obtain a matched filter and a time domain signal; obtaining reconstructed baseband received data for a signal of each channel; obtaining reconstructed signals after matched filtering; accumulating the reconstructed signals of multiple channels to obtain a reconstructed accumulated value, obtaining a compensation value according to a difference between the time domain signal and the reconstructed accumulated value, and compensating the reconstructed signals with the compensation value to obtain an actual received signal of the each channel; and outputting a joint suppression result.

Method and device for joint suppression of narrowband and multiple access interference

A massive multiple-input multiple-output channel emulation method and a device based on optical matrix switching are provided. The method is realized based on a massive multiple-input multiple-output channel emulation system, which includes a plurality of channel preprocessing subsystems, an optical switching subsystem, a plurality of channel characteristic emulation subsystems, a self-checking and self-correcting subsystem, a mathematical simulation and monitoring subsystem and a time-frequency synthesis and distribution subsystem. All the subsystems are interconnected by various optical fiber connections, which are used to transmit high-speed data signals, communication information, control instructions, frequency, pulse and time signals, and have the centralized-distributed layout ability of various devices in the system based on long-distance transmission of optical fiber signals, and have the massive parallel expansion ability of the number of system signal input and output links.

Massive multiple-input multiple-output channel emulation method and device based on optical matrix switching

Growing community of inventors

Changsha, China

Wenxiang Liu