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In this paper, we propose a statistical channel model to study the performance of a line-of-sight underwater wireless optical communication (UWOC) link in a data mulling environment. We optimize the range of geometric parameters including detector aperture diameter and field-of-view (FOV) to reduce the effect of excessive scattering on the optical signal. By considering geometric losses, we observe...
Signal source localization and separation are key tasks for many applications. In this paper, a new deterministic method is proposed for estimating the 3D location and separating multiple acoustic or vibration sources, simultaneously active. The method is based on TDOA measurements obtained via crosscorrelation. Then, with the information from the estimated locations, source separation is achieved...
In this paper, we propose a new positioning method by using wireless local area network systems based on a principle of the Real Time Kinematic-Global Positioning Systems (RTK-GPS). The proposed method collects observations of the carrier phase at access points for double phase difference of the RTK-GPS by following the point coordination function of the IEEE 802.11 standard. We show some numerical...
This paper evaluates the use of an intermediate coupler in a series-series resonant configuration under different magnetic coupler displacements via mathematical and simulation analysis. The circular design was selected and different intermediate coil arrangements were simulated using a 3D FEM software. A variable inductor (VI) is inserted in the transmitter circuit to compensate the extra reactance...
This paper introduces a new innovation for the analytical model to improve the throughput performance and energy efficiency for ideal channel conditions by the integration which challenges both fountain code and Markov chain modeling. In this context, the energy consumption is a critical resource that can be saved by minimizing the number of transmissions to be performed in the network. Channel contention...
In this paper, we show some experimental results of a proposed distance estimator based on the received signal strength indicator. We provide a fact that the proposed estimator outperforms the conventional one with respect to a theoretical analysis, computer simulations and experimental results.
A three dimensional (3-D) channel model including both stationary and moving scatterers for high altitude platforms (HAPs) multiple-input multiple-output (MIMO) communication systems is proposed in this paper. An M-step 2-state Markov process is incorporated into this model to depict the reappearance behavior of both scatterers. The survival probabilities of scatterers are derived by using Chapman-Kolmogorov...
For mainland-island communication applications, radio-over-fiber (RoF) links which have been commonly designated for short-reach access networks need to be re-designed due to the long geogrgphical distance nature. In this paper, we present a calculating model of long-distance RoF communication systems that connect mainland and islands using intensity modulation (IM) technique, two erbium-doped fiber...
This paper presents a secure image transmission based on a chaotic synchronization. Chaotic systems present unpredictable and complex behavior. These characteristics, together with the dependence on the initial conditions as well as the tolerance of this type of systems, make theme ideal for transmission. In this paper a system of encryption based on chaotic signal is proposed. This system is used...
The millimeter wave bands will be used for 5G or IoT to overcome frequency insufficiency. This paper shows relations of received power, multipath delay spread and distance in urban low-rise environments at both 28 and 38 GHz. The wideband characteristics had been measured with a channel sounder, a directional antenna for transmitter, and an omni-directional antenna for receiver in Daejeon area.
Chaotic modulation is a strong method of improving communication security. Analog and discrete chaotic systems are presented in actual literature. Due to the expanse of digital communication, discrete-time systems become more efficient and closer to actual technology. The present contribution presents a reliable design method for a discrete-time nonlinear emitter, based on an analogue prototype. The...
Safety and non-safety application services require a guarantee of network performance, mostly in terms of throughput and packet collision. The current radio propagation path loss models use mean additional attenuation sophisticated fading model and do not consider the obstacle caused due to obstacles of vehicles in LOS of transmitting and receiving vehicles. This affects the attenuation signal at...
Detection and repair of cycle slips is the prerequisite for high precision positioning. This paper proposes a method uses modified MW combination and ionospheric combination. The multipath of MW combination is filtered and then the ionospheric combination is used. This method is able to detect small cycle slips and various combinations of cycle slips. This paper takes experiment on three kinds of...
Lattice codes used under the Compute-and-Forward paradigm suggest an alternative strategy for the standard Gaussian multiple-access channel (MAC). It has been proven that decoding an integer linear combination of the transmitted codewords enables higher data rates compared to decoding the messages individually. Recent work of Gasptar et al. proposed a new multiple access channel technique that they...
This paper presents a solution to the problem of tracking multiple targets from multistatic Doppler measurements. To the best of our knowledge our solution is the first principled multitarget tracker for multistatic Doppler radar. The tracker is based on a closed form solution to the labeled multitarget Bayes filter, which can be implemented with linear complexity in the number of measurements. Numerical...
Accurate and reliable positioning of vehicles is a decisive factor for many Intelligent Transportation System (ITS) applications. Under the cooperative environment, the eco-driving at specific scenarios, like intersections, requires vehicle motion state information, which can be provided by Global Navigation Satellite System (GNSS) with an integrity monitoring capability. In order to provide effective...
An introduction to the study of the behavior of the acoustic wave propagation in a homogeneous dispersive medium is presented in this work. We consider the stationary problem for a two-fluid channel waveguide. The classical normal mode theory as a solution of the scalar wave equation for an idealized stratified fluid layer lying on a semi-half space is described. Graphical solution of the stationary...
In the integrated navigation system, the carrier phase has higher accuracy than the pseudo-range, but it has the problem of the solution of integer ambiguity. This paper proposes a GPS/INS integrated navigation algorithm based on the double-difference of time/inter-satellite with carrier phase. First, the algorithm is used to eliminate the influence of ambiguity by the simplified time-differenced...
In order to promote the popularization of BDS, the BDS / GPS dual-mode positioning is studied, and the pseudorange single point positioning algorithm of the dual-mode system is analyzed. On the basis of the least squares method, the weighted method is used to improve the accuracy of the positioning solution, and a fixed weight method combining the elevation angle model and posterior variance estimation...
This paper presents the key parameters of four different Series-Series Inductive Power Transmission (SS-IPT) configurations: (a) single phase with dual control, (b) single phase with primary side control, (c) three phase with dual control and (d) three phase with primary side control, considering two different control strategies; switching frequency and DC voltage regulations.
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