Charilaos I. Kourogiorgas

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A novel model based on the bivariate inverse Gaussian (IG) distribution is presented for the prediction of the outage performance of a dual site diversity Earth-space system. In the present paper, the exceeded rain attenuation induced on each Earth-space path is assumed that follows the IG distribution. The joint rain attenuation exceedance probability is(More)
Rain attenuation is the dominant fading mechanism for Future Broadband Satellite Communication Systems (operating at Ku band and above). In this paper, hitting time statistics of rain attenuation process are presented using a well accepted dynamic model. Hitting time gives the time needed for a stochastic process to exit an interval of thresholds given the(More)
Next generation communication networks incorporate Land Mobile Satellite (LMS) systems in order to provide greater areas of coverage and higher throughput for specific applications. Cooperation between satellite communication networks and terrestrial relays is or increasing the system’s performance and availability. In this paper, the outage performance of(More)
15-months of rain rate measured at two sites inside the NTUA campus in Greece are analyzed in this paper. The 1-min averaged rain rate time series are calculated through the processing of the tipping bucket measurements. Firstly, the 1<sup>st</sup> order statistics of rain rate are calculated. The experimental long-term Complementary Cumulative Distribution(More)
In this paper, we study the performance of satellite-based sensor networks. In particular, we consider dense networks of M2M sensor devices deployed in several geographical locations. The M2M sensor devices are locally grouped into clusters and communicate with a satellite gateway. The proposed network architecture is a potential solution for remote(More)
The problem of the calculation of the tropospheric effects on low elevation links has become important for the last few years. The limitations of the existing models are summarized and new models developed during COST IC0802 Action are presented. The necessity of making measurement campaigns for testing the models is stressed.
In this paper, a new rain-attenuation stochastic dynamic channel model for low Earth orbit (LEO) satellite links operating above 10 GHz is proposed, taking into account the time dependence of elevation angle and its impact on rain-attenuation dynamics. The new synthesizer is based on the first-order stochastic differential equations (SDEs) and extends the(More)
The ever growing demand for higher data rates in satellite based services along with the congestion of the lower part of the frequency spectrum has led to the migration of new services to higher bands, such as the Ka-, Q/V bands. However, propagation in these bands is more prone to the atmospheric impairments; thus, the effects of the various atmospheric(More)
The Land Mobile Satellite (LMS) channel at 2 GHz is examined and the first order statistics are modeled using experimental data for two tree shadowing scenarios. Considering that the first order statistics of the channel are used as input to channel models as well as for the calculation of the system margins, the modeling of the probability density function(More)
In this paper, a methodology based on Gaussian copulas is examined for generating rain attenuation time series. The methodology lies on the use of Gaussian copula for modeling the joint exceedance probability of rain attenuation for the temporal domain. In this paper, preliminary results for the validity of the use of Gaussian copula for modeling rain(More)