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Human activity recognition based on wireless signals emerges as a research hotspot recently. Though tremendous efforts have been devoted and significant progresses have been achieved, one fundamental issue still remains open, i.e., theoretical modeling between signal dynamics and human activities. This paper fills in the blank by addressing several theoretical issues and providing insightful mathematical...
This paper presents a receiver design for the VLC (Visible Light Communication) system using OFDM modulation. Based on this design specification of OFDM-based system, this receiver comprises of a time and frequency domain conversion, synchronization and equalization functions. The functions of OFDM synchronization contain boundary estimation and sampling clock offset estimation and compensation. Equalization...
The Global Navigation Satellite System (GNSS) is a high precision navigation system based on satellite, which implements worldwide, all-weather, real-time, continuous navigation and position. It is very necessary to establish a rational and flexible simulation system of GNSS, which can help to analyse the characteristics of GNSS and research on technologies of the GNSS receiver, jamming and anti-jamming...
According to the technology system and navigation principle of the microwave landing system (MLS), and according to the electromagnetic (EM) similitude theory, the scale model of the environment of an airport equipped with MLS was set up to simulate the real propagation situation of the navigation signal transmitted by the MLS by the propagation of the laser in the scale model of the airport. The...
The free-space ultraviolet non-line-of-sight communication system has become a hot research topic in the field of wireless communication system for its safety and efficiency. To study the feature of UVNLOS communication system, according to the classic Mie scattering theory, the single-scattering atmospheric channel model and the multi-scattering atmospheric channel model have been built in this paper...
GPS has been broadly applied in every fields of our social life, since the environment around us has been becoming more and more complicated, satellite navigation positioning technology under severe geometry, weather and jamming conditions gains more and more attention. However, It is well known that the GPS satellite navigation system lacks vertical information, which results in poor vertical accuracy...
In this paper the Duffing oscillator is applied to solve high transmitter power consumption and high probability of intercept of underwater mine. A chaotic oscillator has the property of being sensitive to weak signal and being immune to noise, which leads to a potential application in weak signal detection. The weak signals can be used as the outside periodic exciter and be brought in the Duffing...
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