National University of Defense Technology

Ke Zhang

Xinming Huang

Jingyuan Li

Rong Zhou

Zengjun Liu

Lei Chen

Wenxiang Liu

Feixue Wang

Sixin Wang

Guangfu Sun

Hang Gong

Yuchen Xie

Shaojie Ni

Gang Ou

Kuo Cao

Pengcheng Zhang

A Beidou short message communication method and a system for a low-power user terminal are provided. The method includes following steps: by a user terminal, receiving outbound signals broadcast by a central station and forwarded by a satellite transponder, and constructing a short message access frame with a fixed length for transmission; by the central station, receiving and parsing the short message access frame, so as to realize the allocation of time-frequency resource blocks and transmit the time-frequency resource blocks to the user terminal; by the user terminal, transmitting a short message communication frame with a fixed format to the central station; by a communication receiving device of the central station, receiving and sequentially carrying out sampling preprocessing, anti-interference processing, rapid capture and tracking demodulation on the short message communication frame to obtain communication service information, and pushing receipt information to the user terminal to complete an information push.

Beidou short message communication method and system for low-power user terminal

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

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Changsha, China

Ke Zhang