The Experts below are selected from a list of 60510 Experts worldwide ranked by ideXlab platform
Peter Constantinou - One of the best experts on this subject based on the ideXlab platform.
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Capacity results from short range fixed MIMO measurements at 5.2 GHz in urban Propagation Environment
2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004Co-Authors: N. Skentos, G. Pantos, Athanasios G. Kanatas, Peter ConstantinouAbstract:In this paper, wideband MIMO channel measurements conducted in Athens, Greece are described. Short range scenarios with fixed transmitter and receiver, in urban like Environments under LOS Propagation conditions have been measured, using an 8/spl times/8 vector channel sounder operating at 5.2 GHz. Based on the measured MIMO channel matrices, results of mean and outage normalized capacity calculations are presented. These results correspond to systems with various numbers of antenna elements and various ULA antenna configurations.
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ICC - Capacity results from short range fixed MIMO measurements at 5.2 GHz in urban Propagation Environment
2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004Co-Authors: N. Skentos, G. Pantos, Athanasios G. Kanatas, Peter ConstantinouAbstract:In this paper, wideband MIMO channel measurements conducted in Athens, Greece are described. Short range scenarios with fixed transmitter and receiver, in urban like Environments under LOS Propagation conditions have been measured, using an 8/spl times/8 vector channel sounder operating at 5.2 GHz. Based on the measured MIMO channel matrices, results of mean and outage normalized capacity calculations are presented. These results correspond to systems with various numbers of antenna elements and various ULA antenna configurations.
G. Pantos - One of the best experts on this subject based on the ideXlab platform.
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Capacity results from short range fixed MIMO measurements at 5.2 GHz in urban Propagation Environment
2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004Co-Authors: N. Skentos, G. Pantos, Athanasios G. Kanatas, Peter ConstantinouAbstract:In this paper, wideband MIMO channel measurements conducted in Athens, Greece are described. Short range scenarios with fixed transmitter and receiver, in urban like Environments under LOS Propagation conditions have been measured, using an 8/spl times/8 vector channel sounder operating at 5.2 GHz. Based on the measured MIMO channel matrices, results of mean and outage normalized capacity calculations are presented. These results correspond to systems with various numbers of antenna elements and various ULA antenna configurations.
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ICC - Capacity results from short range fixed MIMO measurements at 5.2 GHz in urban Propagation Environment
2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004Co-Authors: N. Skentos, G. Pantos, Athanasios G. Kanatas, Peter ConstantinouAbstract:In this paper, wideband MIMO channel measurements conducted in Athens, Greece are described. Short range scenarios with fixed transmitter and receiver, in urban like Environments under LOS Propagation conditions have been measured, using an 8/spl times/8 vector channel sounder operating at 5.2 GHz. Based on the measured MIMO channel matrices, results of mean and outage normalized capacity calculations are presented. These results correspond to systems with various numbers of antenna elements and various ULA antenna configurations.
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Performance evaluation of OFDM transmission over a challenging urban Propagation Environment
IEEE Transactions on Broadcasting, 2003Co-Authors: G. Pantos, Athanasios G. Kanatas, Philip ConstantinouAbstract:The paper introduces a performance evaluation of orthogonal frequency division multiplexing (OFDM) transmission schemes over a challenging urban Propagation Environment, considering 3D scattering, providing also a comparison with 2D considerations. After an analytic calculation of the power of received signal components (faded useful signal, intercarrier interference, intersymbol interference and noise) the authors present results of system performance evaluation under different Propagation conditions (e.g., various Doppler shift values) and various values of key system parameters. BER (bit error rate) calculations are provided for a 16-QAM OFDM transmission scheme over Rayleigh fading channels, with and without Reed-Solomon coding techniques. Finally, the influence of carrier offset on the system performance is examined.
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PIMRC - Delay spread measurements and characterization in a special Propagation Environment for PCS microcells
The 13th IEEE International Symposium on Personal Indoor and Mobile Radio Communications, 1Co-Authors: Nektarios Moraitis, G. Pantos, Athanasios G. Kanatas, Philip ConstantinouAbstract:This paper reports the measurement and analysis of a wideband radio channel at 1900 MHz within a special Propagation Environment such as the Olympic Stadium of Athens. RMS delay spread values are evaluated as well as the coherence bandwidth of the channel is derived by the frequency correlation function. The mean delay spread is found to be 0.314 /spl mu/s and 0.731 /spl mu/s for LOS and NLOS conditions respectively. The mean coherence bandwidth that characterizes the entire area reaches 3.463 MHz providing wide transmission data rates. The correlation bandwidth is found to be inversely proportional to the RMS delay spread and modeled in a minimum mean square error sense.
Athanasios G. Kanatas - One of the best experts on this subject based on the ideXlab platform.
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Capacity results from short range fixed MIMO measurements at 5.2 GHz in urban Propagation Environment
2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004Co-Authors: N. Skentos, G. Pantos, Athanasios G. Kanatas, Peter ConstantinouAbstract:In this paper, wideband MIMO channel measurements conducted in Athens, Greece are described. Short range scenarios with fixed transmitter and receiver, in urban like Environments under LOS Propagation conditions have been measured, using an 8/spl times/8 vector channel sounder operating at 5.2 GHz. Based on the measured MIMO channel matrices, results of mean and outage normalized capacity calculations are presented. These results correspond to systems with various numbers of antenna elements and various ULA antenna configurations.
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ICC - Capacity results from short range fixed MIMO measurements at 5.2 GHz in urban Propagation Environment
2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004Co-Authors: N. Skentos, G. Pantos, Athanasios G. Kanatas, Peter ConstantinouAbstract:In this paper, wideband MIMO channel measurements conducted in Athens, Greece are described. Short range scenarios with fixed transmitter and receiver, in urban like Environments under LOS Propagation conditions have been measured, using an 8/spl times/8 vector channel sounder operating at 5.2 GHz. Based on the measured MIMO channel matrices, results of mean and outage normalized capacity calculations are presented. These results correspond to systems with various numbers of antenna elements and various ULA antenna configurations.
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Performance evaluation of OFDM transmission over a challenging urban Propagation Environment
IEEE Transactions on Broadcasting, 2003Co-Authors: G. Pantos, Athanasios G. Kanatas, Philip ConstantinouAbstract:The paper introduces a performance evaluation of orthogonal frequency division multiplexing (OFDM) transmission schemes over a challenging urban Propagation Environment, considering 3D scattering, providing also a comparison with 2D considerations. After an analytic calculation of the power of received signal components (faded useful signal, intercarrier interference, intersymbol interference and noise) the authors present results of system performance evaluation under different Propagation conditions (e.g., various Doppler shift values) and various values of key system parameters. BER (bit error rate) calculations are provided for a 16-QAM OFDM transmission scheme over Rayleigh fading channels, with and without Reed-Solomon coding techniques. Finally, the influence of carrier offset on the system performance is examined.
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PIMRC - Delay spread measurements and characterization in a special Propagation Environment for PCS microcells
The 13th IEEE International Symposium on Personal Indoor and Mobile Radio Communications, 1Co-Authors: Nektarios Moraitis, G. Pantos, Athanasios G. Kanatas, Philip ConstantinouAbstract:This paper reports the measurement and analysis of a wideband radio channel at 1900 MHz within a special Propagation Environment such as the Olympic Stadium of Athens. RMS delay spread values are evaluated as well as the coherence bandwidth of the channel is derived by the frequency correlation function. The mean delay spread is found to be 0.314 /spl mu/s and 0.731 /spl mu/s for LOS and NLOS conditions respectively. The mean coherence bandwidth that characterizes the entire area reaches 3.463 MHz providing wide transmission data rates. The correlation bandwidth is found to be inversely proportional to the RMS delay spread and modeled in a minimum mean square error sense.
N. Skentos - One of the best experts on this subject based on the ideXlab platform.
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Capacity results from short range fixed MIMO measurements at 5.2 GHz in urban Propagation Environment
2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004Co-Authors: N. Skentos, G. Pantos, Athanasios G. Kanatas, Peter ConstantinouAbstract:In this paper, wideband MIMO channel measurements conducted in Athens, Greece are described. Short range scenarios with fixed transmitter and receiver, in urban like Environments under LOS Propagation conditions have been measured, using an 8/spl times/8 vector channel sounder operating at 5.2 GHz. Based on the measured MIMO channel matrices, results of mean and outage normalized capacity calculations are presented. These results correspond to systems with various numbers of antenna elements and various ULA antenna configurations.
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ICC - Capacity results from short range fixed MIMO measurements at 5.2 GHz in urban Propagation Environment
2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004Co-Authors: N. Skentos, G. Pantos, Athanasios G. Kanatas, Peter ConstantinouAbstract:In this paper, wideband MIMO channel measurements conducted in Athens, Greece are described. Short range scenarios with fixed transmitter and receiver, in urban like Environments under LOS Propagation conditions have been measured, using an 8/spl times/8 vector channel sounder operating at 5.2 GHz. Based on the measured MIMO channel matrices, results of mean and outage normalized capacity calculations are presented. These results correspond to systems with various numbers of antenna elements and various ULA antenna configurations.
Bernard Henri Fleury - One of the best experts on this subject based on the ideXlab platform.
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cluster characteristics in a mimo indoor Propagation Environment
IEEE Transactions on Wireless Communications, 2007Co-Authors: Nicolai Czink, Xuefeng Yin, H Ozcelik, M Herdin, E Bonek, Bernard Henri FleuryAbstract:Essential parameters of physical, Propagation-based MIMO channel models are the fading statistics and the directional spread of multipath clusters. In this paper we determine these parameters in the azimuth-of-arrival/azimuth-of-departure (AoA/AoD) domain based on comprehensive indoor MIMO measurements at 5.2 GHz in a cluttered office Environment using the SAGE algorithm for parameter estimation. Due to cluster identification in AoA/AoD-domain we found a greater number of clusters than those reported in previous publications. Regarding the fading statistics of clusters, so far not studied, strong (obstructed-)line-of-sight clusters show Rician fading, corresponding to few dominant Propagation paths, whereas most clusters exhibit Rayleigh fading, corresponding to many paths with approximately equal powers and uncorrelated phases. Root-mean-square cluster azimuth spreads (CASs) were estimated with a novel method by appropriately restricting the support of the cluster azimuth distribution. We found that the estimated CASs are different when seen from transmitter or receiver, i.e. their ranges are from 2deg to 9deg and from 2deg to 7deg at the transmitter side and the receiver side, respectively
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performance of a high resolution scheme for joint estimation of delay and bidirection dispersion in the radio channel
Vehicular Technology Conference, 2002Co-Authors: Bernard Henri Fleury, K G Rohbrandt, P Jourdan, A StuckiAbstract:This contribution presents results from an application of the SAGE (space-alternating generalized expectation-maximization) algorithm published in Fleury et al. (2002) to measurement data collected in a selected Propagation Environment. The scheme jointly estimates the delay, the direction (i.e. azimuth and coelevation) of departure, the direction of incidence, as well as the Doppler frequency of waves propagating from the transmitter to the receiver. An improved initialization and search procedure is proposed which enhances the probability of identifying weak paths and therefore allows for a more comprehensive and detailed characterization of the Propagation mechanisms. In order to relate the estimated waves to the Propagation Environment, a simple method based on ray tracing attempts to reconstruct the Propagation paths based on the estimated wave parameters while assuming oneand two-bounce scattering. Significant objects can be identified in the Environment that coincide with the interaction points of the calculated paths. The same conclusions can be drawn from similar analyses of other Environments. The presented results demonstrate the high potential of high-resolution estimation techniques performing true joint estimation of delay, direction of departure, and direction of incidence for detailed investigations of dispersion in the radio channel jointly in delay and in direction at both transmitter and receiver sites. These studies are of paramount importance for an accurate characterization of MIMO (multiple-input multiple-output) systems operating in these channels.
