The Experts below are selected from a list of 63351 Experts worldwide ranked by ideXlab platform

G L Stuber - One of the best experts on this subject based on the ideXlab platform.

  • an efficient algorithm for estimating the signal to Interference Ratio in tdma cellular systems
    IEEE Transactions on Communications, 1998
    Co-Authors: M Turkboylari, G L Stuber
    Abstract:

    A new algorithm is proposed for estimating the signal-to-Interference plus noise Ratio S/(I+N) in time-division multiple-access (TDMA) cellular systems. The S/(I+N) estimator is evaluated for use in the IS-54/136 system and a GSM-like system, and compared with existing techniques. The algorithm has a mean square prediction error that is comparable to the best known S/(I+N) estimation schemes, but with a significantly reduced computational complexity.

M Turkboylari - One of the best experts on this subject based on the ideXlab platform.

  • an efficient algorithm for estimating the signal to Interference Ratio in tdma cellular systems
    IEEE Transactions on Communications, 1998
    Co-Authors: M Turkboylari, G L Stuber
    Abstract:

    A new algorithm is proposed for estimating the signal-to-Interference plus noise Ratio S/(I+N) in time-division multiple-access (TDMA) cellular systems. The S/(I+N) estimator is evaluated for use in the IS-54/136 system and a GSM-like system, and compared with existing techniques. The algorithm has a mean square prediction error that is comparable to the best known S/(I+N) estimation schemes, but with a significantly reduced computational complexity.

Timothy X Brown - One of the best experts on this subject based on the ideXlab platform.

  • Stochastic Ordering Based Carrier-to-Interference Ratio Analysis for the Shotgun Cellular Systems
    IEEE Wireless Communications Letters, 2012
    Co-Authors: Prasanna Madhusudhanan, Juan G Restrepo, Youjian Liu, Timothy X Brown, Kenneth R. Baker
    Abstract:

    An analytical tool based on usual stochastic ordering is developed to compare the distributions of carrier-to-Interference Ratio at the mobile station of cellular systems where the base stations are distributed randomly according to certain non-homogeneous Poisson point processes. The comparison is done by studying the base station densities without having to solve for the distributions of the carrier-to-Interference Ratio, which are often hard to obtain.

  • carrier to Interference Ratio analysis for the shotgun cellular system
    Global Communications Conference, 2009
    Co-Authors: Prasanna Madhusudhanan, Juan G Restrepo, Youjian Liu, Timothy X Brown
    Abstract:

    This paper analyzes the carrier-to-Interference Ratio of the so-called shotgun cellular system (SCS). In the SCS, base-stations are placed randomly according to a two-dimensional Poisson point process. Such a system can model a dense cellular or wireless data network deployment, where the base station locations end up being close to random due to constraints other than optimal coverage. The SCS is a simple cellular system where we can introduce several variations and design scenarios such as shadow fading, power control features, and multiple channel reuse groups, and assess their impact on the performance. We first derive an analytical expression for the characteristic function of the inverse of the carrier-to-Interference Ratio. Using this result, we show that the carrier-to-Interference Ratio is independent of the base station density and further, we derive a semi-analytical expression for the tail-probability. These results enable a complete characterization of the cellular performance of the SCS. Next, we incorporate shadow fading into the SCS and demonstrate that it merely scales the base station density by a constant. Hence, the cellular performance of the SCS is independent of shadow fading. These results are further used to analyze dense cellular scenarios.

  • GLOBECOM - Carrier to Interference Ratio Analysis for the Shotgun Cellular System
    GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference, 2009
    Co-Authors: Prasanna Madhusudhanan, Juan G Restrepo, Youjian Liu, Timothy X Brown
    Abstract:

    This paper analyzes the carrier-to-Interference Ratio of the so-called shotgun cellular system (SCS). In the SCS, base-stations are placed randomly according to a two-dimensional Poisson point process. Such a system can model a dense cellular or wireless data network deployment, where the base station locations end up being close to random due to constraints other than optimal coverage. The SCS is a simple cellular system where we can introduce several variations and design scenarios such as shadow fading, power control features, and multiple channel reuse groups, and assess their impact on the performance. We first derive an analytical expression for the characteristic function of the inverse of the carrier-to-Interference Ratio. Using this result, we show that the carrier-to-Interference Ratio is independent of the base station density and further, we derive a semi-analytical expression for the tail-probability. These results enable a complete characterization of the cellular performance of the SCS. Next, we incorporate shadow fading into the SCS and demonstrate that it merely scales the base station density by a constant. Hence, the cellular performance of the SCS is independent of shadow fading. These results are further used to analyze dense cellular scenarios.

Ghosheh Abed Hodtani - One of the best experts on this subject based on the ideXlab platform.

  • Carrier to Interference Ratio analysis in shotgun cellular systems over a generalized shadowing distribution
    Wireless Networks, 2019
    Co-Authors: Ali Mohammad Khodadoust, Ghosheh Abed Hodtani
    Abstract:

    Shotgun cellular systems (SCSs) are wireless communication systems with randomly placed base stations (BSs) over the entire plane according to a two-dimensional Poisson point process. Such a system can model a dense cellular or wireless data network deployment, where the BS locations end up being close to random due to constraints other than optimal coverage. SCSs have been studied by considering path-loss and independent shadowing paths between BS to mobile station (MS) pairs in the channel models. In this paper, we consider correlated shadowing paths between BS to MS pairs as a most important factor, and analyze the carrier to Interference Ratio (CIR), in a SCS over this correlation, and determine an expression for distribution of CIR, and obtain the tail probability of the CIR.

  • Carrier to Interference Ratio, rate and coverage analysis in shotgun cellular systems over composite fading channels
    Physical Communication, 2017
    Co-Authors: Asma Bagheri, Ghosheh Abed Hodtani
    Abstract:

    Abstract Wireless communication performance in shotgun cellular system (SCS: wireless communication system with randomly placed base stations) is analysed. Aiming at this analysis, (i) the carrier to Interference Ratio (CIR), as an important measure in a cellular network, is considered in the downlink (path-loss, shadowing and multi-path) fading channel. Since direct calculating of the distribution of CIR is complicated, a related mathematical equation is determined through which the probability density function (PDF) of CIR can be calculated. And then, as a special case, the tail probability of CIR is obtained. (ii) A normal approximation for inverse of CIR is proposed which is applicable for calculating a tractable PDF for the downlink CIR. The analytically calculated and the approximate PDFs of CIR are compared with numerical PDFs. (iii) The distribution of the downlink rate and a lower bound for the average rate; the analytical expression for coverage of a user in an SCS based on its received CIR, and an average value for coverage are calculated. (iv) Simulation results show that the closed form and approximate PDFs over different models are close to numerical ones.

John D. Kanellopoulos - One of the best experts on this subject based on the ideXlab platform.

  • A model for the estimation of the carrier‐to‐noise plus total Interference Ratio between two adjacent dual polarized satellite links sharing the same frequency band
    International Journal of Satellite Communications and Networking, 2004
    Co-Authors: Vasilios K. Katsambas, John D. Kanellopoulos
    Abstract:

    In modern satellite communications, matters such as frequency congestion, transmission of dual polarized carriers and increase of the number of geostationary satellites in use, necessitate the implementation of Interference analysis in neighbouring networks so as to ensure satisfactory quality of service. In this paper, a recently proposed model for the prediction of the degradation of the carrier-to-Interference Ratio due to differential rain attenuation and cross-polarization, which is applicable only for the noise-dominant case, has been properly modified to include the general case. The proposed model is based on the lognormal assumption for the point rainfall rate statistics and the convective raincell model. Due to complexity of the proposed analysis, some simple regression-derived formulas have been generated forming a very useful tool for the system engineer. The elaboRations of numerical results examine the influence of various parameters upon the total availability performance and the optimum utilization of the geostationary orbit. Copyright © 2005 John Wiley & Sons, Ltd.

  • Prediction of the degradation of the carrier‐to‐noise plus Interference Ratio concerning a site diversity system suffering from differential rain attenuation
    Radio Science, 2002
    Co-Authors: S. N. Livieratos, John D. Kanellopoulos
    Abstract:

    [1] Rain-induced attenuation is a factor of utmost importance in designing a satellite link since it can strongly deteriorate the availability and performance of an Earth-space path. Availability and performance are key criteria for the reliable design process. In the present paper the statistics of carrier-to-noise plus Interference Ratio under rain fade conditions are examined, given that the Interference is caused by an adjacent satellite operating at the same frequency, and taking also under consideRation double site diversity protection as a countermeasure technique. The method presented herein is based on a model of convective rain cells and the lognormal assumption for the point rainfall statistics. Numerical results have been obtained for heavy rain climatic regions and very large availability times, to examine how effective site diversity can be, not only for lowering fade margins but for compensating severe Interference effects. Moreover, the elaboRation of the numerical results has revealed how the optimum design of the satellite link can be achieved by selecting proper values for some critical parameters of the system.

  • Analysis of the Degradation of the Carrier-To-Noise Plus Total Interference Ratio Concerning a Dual Polarization Site Diversity System Suffering From Differential Rain Attenuation
    Journal of Electromagnetic Waves and Applications, 2002
    Co-Authors: John D. Kanellopoulos, S. N. Livieratos
    Abstract:

    For the modern satellite systems where frequency and orbital congestion will be an expectable fact the analysis of the Interference effects is considered to be of utmost importance. In this paper, the differential rain attenuation from an adjacent satellite system as well as the rain cross-polarization (valid for frequency re-use systems) are assumed to be the dominant Interference sources. A method to predict the carrier-to-noise plus total Interference Ratio statistics applied to a single-site system is extended to include systems operating under a site diversity protection scheme. The method is based on a model of convective raincells and the lognormal assumption for the point rainfall statistics. The numerical results examine the influence of various parameters upon the total availability performance and it is expected to be useful toward the optimum system design in the future.

  • Analysis of the Total Carrier-To-Noise Plus Interference Ratio Statistics Applied To Adjacent Satellite Interference Under the Presence of Rain
    Journal of Electromagnetic Waves and Applications, 1998
    Co-Authors: John D. Kanellopoulos, S. N. Livieratos
    Abstract:

    Interference effects are of utmost importance to the reliable design of satellite communication systems. In this paper, Interference caused by differential rain attenuation from an adjacent Earth-space system operating at the same frequency is considered as dominant. In particular, a method to predict rain differential attenuation statistics, used for noise-dominant systems, is extended to include the general case when the calculation of the degradation of the total carrier-to-noise plus Interference Ratio (CNIR) under the presence of rain fading conditions, is necessary. The method is again based on a model of convective raincells and on the lognormal assumption for point rainfall rate statistics. The numerical results are concentrated on the analytical examination of the influence of various opeRational parameters upon the CNIR statistics and the subsequent outage performance of the system.

  • Carrier-to-Interference Ratio statistics of an Earth-space system interfered by an adjacent satellite system and a point-to-point microwave system under rain fades
    IEEE AFRICON. 6th Africon Conference in Africa, 1
    Co-Authors: Athanasios D. Panagopoulos, M. Margoni, John D. Kanellopoulos
    Abstract:

    The purpose of this paper is to present an analytical propagation model dealing with the prediction of the degradation of the carrier-to-Interference Ratio (CIR) of an Earth-space system, operating at frequency above 10 GHz, interfered by an adjacent satellite system and a point-to-point microwave system under rain fades. The dominant source of Interference due to rain considered here is the differential rain attenuation.