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11 results on '"Feng, Zhongxiu"'

4. Channel Coding for Satellite-Terrestrial Integrated Communication: Classic Applications, Key Technologies, and Challenges

Author

Liu, Yangyang, Xiao, Lixia, Liu, Weidan, Feng, Zhongxiu, and Jiang, Tao

Abstract

Satellite-terrestrial integrated communication constitutes an appealing paradigm for future wireless communication, and has been deemed inevitable in order to achieve seamless global coverage. It is foreseeable that satellite-terrestrial integrated communication will realize information transmission in a more complex space-time environment. Affected by fading, noise, and interference, the signal will be severely distorted. Channel coding is recommended as an essential step to improve the reliability of communication systems. Most existing channel coding schemes are designed for separate terrestrial or satellite communications, and there remains a great deal of uncharted territory in the study of new radio (NR) transmission consistency for integrated satellite-terrestrial architecture. Inspired by this, we provide an easy-reading overview of channel coding in terrestrial and satellite communication systems, highlighting novel technical challenges and potential research directions in response to the development trend of satellite-terrestrial integration.

Published
2024
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10. Low Power Structure Digital Up Converter Design for Software Radio System.

Author

Feng, Zhongxiu, Yao, Yafeng, and Gao, Di

Subjects
*SOFTWARE radio, *DESIGN software, *RADIO technology, *SOFTWARE architecture, *SYSTEMS software, *ANALOG-to-digital converters, *DIGITAL-to-analog converters
Abstract

The numerically controlled oscillator is often supposed to operate after interpolation in a conventional digital up converter, but such a converter works at quite high frequencies and consumes more power. In this paper, a type of low power structure digital up converter is proposed which carries out mixing and interpolating gradually, where the numerically controlled oscillator and the interpolation filter can both work at a lower frequency. Low power structure can move signal to any position within the whole Nyquist Band. Furthermore, the interpolation filter adopts a half-band filter with the structure of two parallel branches, which combines the functions of stuffing zero, filtering and modulation, and makes programmable modulation by exchanging input paths. A simulation is carried out on the Xilinx KC705 development kit, which indicates that its maximum work frequency of the low power structure reaches 392 MHz while its power consumption reduces by 33.3% compared to the conventional structure. [ABSTRACT FROM AUTHOR]

Published
2021
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