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Mobile Healthcare Networks (MHN) continuouslycollect the patients' health data sensed by wearable devices, andanalyze the collected data pre-processed by servers combinedwith medical histories, such that disease diagnosis and treatmentare improved, and the heavy burden on the existing healthservices is released. However, the network is vulnerable to Sybilattacks, which would degrade network performance,...
Based on the public key compressing technique and the Chinese Remainder Theorem, an efficient somewhat homomorphic encryption (SWHE) scheme is proposed, whose security can be reduced to the approximate greatest common divisor problem. Then the fully homomorphic encryption scheme is obtained by using Gentry's squashing decryption circuit technique, which could resist chosen plaintext attacks. The efficiency...
This paper studied the problem of cooperative trajectory planning integrated target assignment for multiple unmanned combat aerial vehicles, servicing multiple targets. The problem is formulated as a dynamics-constrained, multiple depot, multiple traveling salesman problem with neighborhoods (DC_MDMTSPN), which is a variant of the multiple traveling salesman problem (MTSP). Then, the entire process...
The problem of generating a robust attack position plan for multi-UCAV cooperative attacking the moving target on the sea area is studied. There are many kinds of uncertain factors in the execution of multi-UCAV cooperative attack task, and the hostile target's maneuverability plays an important role. In order to handle the uncertainties in the cooperative attack mission well, a new approach based...
Fully homomorphic encryption has been viewed as a mechanism that enables to do arbitrary computations on encrypted data, without ever decrypting it. So fully homomorphic encryption owns great value in cloud computing, secure multiparty computation and so on. To obtain a leveled fully homomorphic encryption scheme, we present a comparatively simple and natural method, that is the approximate eigenvector...
The decentralized H∞ control problem for discrete-time large-scale overlapping systems is considered in this paper. Based on the founded stability theorem of discrete-time systems, a sufficient condition for the existence of a decentralized H∞ two-parts-controller for discrete-time large-scale overlapping systems is presented in terms of the solvability to a certain discomposed system of matrix inequalities,...
The proposed routing protocol BQAODV considers link stability, available bandwidth estimation, direction conformity and delay constraint based on AVAODV routing protocol. It selects a highest link stability route which meets available bandwidth, direction conformity and delay constraint during the search for a new route. The simulation results show that BQAODV's data packet loss rate and average end-to-end...
A novel photonic approach for the instantaneous microwave frequencies measurement (IFM) using microfiber ring resonator (MRR)-based photonic differentiator is proposed and experimentally demonstrated. A square and monotonic relationship between the amplitude comparison function (ACF) and the frequency of the incoming microwave signal is established and used for the microwave frequency estimation,...
This paper innovatively proposes an indoor wireless propagation model in WiFi radio-over-fiber network architecture for received signal strength (RSS) based localization in the Internet of Things. The proposed model adds attenuation terms of obstacles in each sub-space by dividing the room into several sub-spaces according to the obstacles' distribution. The influence of obstacles in sub-space on...
A photonic approach for microwave frequency measurement was proposed based on incoherent microwave photonic filters. The fiber employed is short that performs good real-time response and the implementation owns the stability and tunable measurement range.
Coherence multiplexing (CM) based Radio-over-Fiber (RoF) system is experimentally investigated for the first time for both single tone RF signal and ultra-wideband orthogonal frequency division multiplexing (UWB-OFDM) signal. The impact of received optical power, linewidth of the optical source, input RF power and fiber length are considered. It is found that the system is seriously limited by beat...
A compact single-ended setup for stimulated Brillouin scattering (SBS) spectra characterization is proposed based on microwave modulated optical sidebands and Fresnel reflection in optical fibers. The measured spectra agree well with the theoretical Lorentzian profile.
This paper presents our recent progress on advanced radio-over-fiber (ROF) technologies for in-building optical-wireless access networks, including multi-service, full duplex and polarization diversity ROF systems design, and experimental delivery of uncompressed HDTV signals. The novel polarization diversity technique is proposed to improve receiving sensitivity and increase anti-interference capacity...
A novel scheme of 2.5 Gb/s optical PSK signals transmission and ASK wireless signals generation with 15 GHz carrier based on heterodyne detection is demonstrated, which can realize polarization diversity and provide 1.3 Gb/s HDTV applications.
A photonic subcarrier BPSK modulator with optical SSB format is proposed based on a frequency discriminator using a phase modulator loop mirror filter. The generation of 18-GHz WDM subcarrier conveying BPSK signal is experimentally demonstrated.
In this paper, an OFDM-ROF communication system is designed and simulated. Special attention has been paid on chromatic dispersion and nonlinear effect brought by fiber transmission. The simulation results of the fiber transmission part are obtained based on spilt-step Fourier method and nonlinear Schrodinger equation. The theory of pulse compression is utilized which would greatly improve the system...
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