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29 results on '"Yan, Tianfeng"'

1. Interference Emitter Localization Based on Hyperbolic Passive Location in Spectrum Monitoring

Author

Wang, Yixuan, Yang, Zhifei, Gao, Rui, Yang, Jianhui, Yan, Tianfeng, Hu, Qinghua, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Liu, Qi, editor, Mısır, Mustafa, editor, Wang, Xin, editor, and Liu, Weiping, editor

Published
2020
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2. Research on GNSS Positioning Aided by SVR

Author

Yang, Zhifei, Yan, Tianfeng, Yang, Yifei, Qi, Jinping, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Liu, Qi, editor, Mısır, Mustafa, editor, Wang, Xin, editor, and Liu, Weiping, editor

Published
2020
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3. An Improved Propagation Prediction Model Based on Okumura-Hata Model

Author

Gao, Rui, Zhao, Yanan, Wang, Yixuan, Yan, Tianfeng, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Liu, Qi, editor, Mısır, Mustafa, editor, Wang, Xin, editor, and Liu, Weiping, editor

Published
2020
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4. An Improved Cyclostationary Feature Detection Algorithm

Author

Yan, Tianfeng, Xu, Fuxin, Wei, Nan, Yang, Zhifei, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Liu, Qi, editor, Mısır, Mustafa, editor, Wang, Xin, editor, and Liu, Weiping, editor

Published
2020
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5. TDOA Time Delay Estimation Algorithm Based on Cubic Spline Interpolation

Author

Yan, Tianfeng, Zhang, Yu, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Liu, Qi, editor, Mısır, Mustafa, editor, Wang, Xin, editor, and Liu, Weiping, editor

Published
2020
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6. A Low-Bit-Rate Image Semantic Communication System Based on Semantic Graph.

Author

Dong, Jiajun, Yan, Tianfeng, and Sun, Wenhao

Subjects
TELECOMMUNICATION systems, DEEP learning, BIT rate, FEATURE extraction, SIGNAL-to-noise ratio, COMMUNICATION models
Abstract

In the progress of research in the field of semantic communication, most efforts have been focused on optimizing the signal-to-noise ratio (SNR), while the design and optimization of the bit rate required for transmission have been relatively neglected. To address this issue, this study introduces an innovative low-bit-rate image semantic communication system model, which aims to reconstruct images through the exchange of semantic information rather than traditional symbol transmission. This model employs an image feature extraction and optimization reconstruction framework, achieving visually satisfactory and semantically consistent reconstruction performance at extremely low bit rates (below 0.03 bits per pixel (bpp)). Unlike previous methods that used pixel accuracy as the standard for distortion measurement, this research introduces multiple perceptual metrics to train and evaluate the proposed image semantic encoding model, aligning more closely with the fundamental purpose of semantic communication. Experimental results demonstrate that, compared to WebP, JPEG, and deep learning-based image codecs, our model not only provides a more visually pleasing reconstruction effect but also significantly reduces the required bit rate while maintaining semantic consistency. [ABSTRACT FROM AUTHOR]

Published
2024
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28. An Improved Propagation Prediction Model Based on Okumura-Hata Model

Author

Yan Tianfeng, Wang Yixuan, Rui Gao, and Yanan Zhao

Subjects
Computer engineering, Mathematical model, Computer science, business.industry, Electromagnetic environment, Path loss, Wireless, Terrain, Macrocell, Okumura model, business, Radio spectrum
Abstract

The explosive development of wireless communications has brought severe challenges to radio spectrum strategy and planning. In the complex electromagnetic environment, accurate spectrum availability estimation and simulation are playing an increasingly important role in economic development. In recent decades, many researchers and engineers presented a large number of mathematical models to attempt to solve this problem. Okumura-Hata model is one of the most popular models for predicting macrocell path loss in a general flat terrain, but is poor in the mountainous terrain. This paper proposes an improved propagation prediction model based on the Okumura-Hata model, considering the effect of ductile diffraction in the hilly terrain environment. Furthermore, we designed a comparative experiment to verify the effectiveness of improved propagation prediction model. Finally, the results of simulation analysis show that this improved propagation prediction model has high accuracy result in mountains terrain environment.

Published
2019

29. Interference Emitter Localization Based on Hyperbolic Passive Location in Spectrum Monitoring

Author

Yang Zhifei, Yan Tianfeng, Yang Jianhui, Wang Yixuan, Rui Gao, and Qinghua Hu

Subjects
Interference (communication), Computer science, Spectrum (functional analysis), Electronic engineering, Multilateration, Security token, Signal, Field (computer science), Common emitter
Abstract

Interference signals can always be found during spectrum monitoring, which has a serious impact in the regular use of radio business [1]. Sometimes is difficult to shied it by suppress signal, so it is becoming increasingly important to find the location of the interference emitter [2]. This paper proposed an effective technique in interference emitter localization based on intersections of hyperbolic curves defined by the time differences of arrival of a signal received at three monitoring stations. The approach is noniterative and gives an explicit solution. In the end, this paper token a field test based on the hardware platform, the final result is given.

Published
2019

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