变速率多带多路并行脉冲混沌超宽带系统设计及优化技术研究
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1.An Block Image Encryption Algorithm Based on Reversible Cellular Automata
- 关键词:
- Cellular automata;Cryptography;Wavelet transforms;Image compression;Frequency domain analysis;Iterative methods;Chaotic map;Chaotics;Encryption and decryption;Image blocks;Image encryption algorithm;Image encryption scheme;Images encryptions;Integer wavelet transforms;Preparation phasis;Reversible cellular automata
- Song, Xiaomeng;Shi, Mengna;Zhou, Yanqi;Wang, Erfu
- 《21st IEEE International Conference on Communication Technology, ICCT 2021》
- 2021年
- October 13, 2021 - October 16, 2021
- Tianjin, China
- 会议
This article proposed a block image encryption scheme based on reversible cellular automata (RCA) and chaotic systems in order to construct an image encryption scheme with great confidentiality effect and high encryption and decryption efficiency. In the preparation phase of this algorithm, the original image is transformed into the frequency domain using the method of integer wavelet transform (IWT). The IWT divides the plaintext image into four frequency blocks. The low-frequency image block containing critical information is treated differently from other high-frequency image blocks in the following procedure. In order to avoid direct processing of image blocks with visual significance, a combined one-dimensional chaotic map is used to rearrange the pixel positions within the image blocks respectively. The chaotic map is then used to acquire various RCA rules and iterations. According to the different importance of the information stored in the image block, the RCA evolution of the image block is carried out with different rules and different iteration times. Finally, the image is scrambled and diffused around the whole image to reduce the blocking effect. The algorithm blocks the images according to different importance and encrypts them at different levels. Avoiding the waste of time and resources caused by the same operation on the whole image.© 2021 IEEE....2.Analysis of TDOA Location Algorithm Based on Ultra-Wideband
- 关键词:
- Time of arrival;Mean square error;Ultra-wideband (UWB);Indoor positioning;Positioning system;Root mean square errors;TDOA location
- Li, Wenquan;Zhao, Bing
- 《8th International Conference on Communications, Signal Processing, and Systems, CSPS 2019》
- 2020年
- July 20, 2019 - July 22, 2019
- Urumqi, China
- 会议
Ultra-wideband has great advantages in indoor positioning. This paper introduces the TDOA technology commonly used in positioning systems. The two algorithms based on TDOA technology are emphasized: Chan and Taylor are described by mathematical modeling, and then simulated and compared. The algorithm localization results based on root mean square error are given. © 2020, Springer Nature Singapore Pte Ltd.
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