2022
DOI: 10.21203/rs.3.rs-1623887/v1
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Optimization of pre-equalized time reversal security transmission systems assisted with artificial noise

Abstract: Time reversal (TR) transmission technology can focus the power of a signal in both time and space domains and reduce signal energy leakage to unintended receivers, making it suitable for physical layer security systems. By adding a pre-equalizer to the transmitter and optimizing it, the performance of multi-antenna TR transmission system can be improved obviously with an acceptable optimization complexity. In this paper, the pre-equalizer and artificial noise (AN) are jointly optimized to enhance the security … Show more

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“…On the basis of China's traditional culture, the cultural connotation of jade is deeply excavated and developed, and the rich cultural connotation is the support to create jade carving artworks, which will be a direction with development prospects. Artists can combine the characteristics of jade with the characteristics of traditional culture, history and folk custom, and use modern techniques and thinking to present jade culture to more people [3]. At present, the country vigorously advocates the development of cultural industry, intangible cultural heritage technology is vigorously protected and carried forward, and the acceptance of intangible cultural heritage technology by the masses is also increasing.…”
Section: Background and Current Situationmentioning
confidence: 99%
“…On the basis of China's traditional culture, the cultural connotation of jade is deeply excavated and developed, and the rich cultural connotation is the support to create jade carving artworks, which will be a direction with development prospects. Artists can combine the characteristics of jade with the characteristics of traditional culture, history and folk custom, and use modern techniques and thinking to present jade culture to more people [3]. At present, the country vigorously advocates the development of cultural industry, intangible cultural heritage technology is vigorously protected and carried forward, and the acceptance of intangible cultural heritage technology by the masses is also increasing.…”
Section: Background and Current Situationmentioning
confidence: 99%
“…The main influence of spatial differentiation is the proportion of added value of secondary and tertiary industries in GDP [2]. Zou Lei, Liu Huiyuan, Wang Feiyu et al analyzed the characteristics of regional differences in the level of green development of city clusters in the middle reaches of the Yangtze River and its influencing factors from 2008 to 2018 by using the comprehensive indicator evaluation model, spatial autocorrelation analysis and geodetector [3]. Zhao Wei, Lin Jian, Wang Shufang and others considered 13 indicators of human activities in order to evaluate the impact of human activities on the groundwater environment in various subsystems of the groundwater in Beijing, and used the coefficient of variation method to determine the weights of the indicators for the comprehensive evaluation, and obtained the results that the impacts of human activities on the first aquifer group were greater than that of the second aquifer group, and that the impacts on the groundwater subsystems of the Yongding River and the Chaobai River were greater than that on other groundwater subsystems [4].…”
Section: Introductionmentioning
confidence: 99%