Global ETD Search
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Showing 1 to 16 of 16 for “"Rician"”.
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Analysis on the use of EM algorithm for space time coding in fading channels
… is effective in reducing the BER performance in Rician fading channel. The EM algorithm receiver is studied in flat, fast fading channel for various pilot symbol configurations, Rayleigh, Rician and Nakagami fading channels, use of high energy pilots and different number of transmit antennas. The …
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Communication for wideband fading channels : on theory and practice
… channel models: the discrete-time memoryless Rician fading channel and the Rayleigh block fading channel. When the input is subject to an average power constraint. it is shown that the capacity-achieving input amplitude distribution for a Rician channel is discrete with a finite number of mass …
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Resource allocation in realistic wireless cognitive radios networks
… coefficients are modeled using Rayleigh and Rician distributions, and closed-form expressions are derived for the average utility functions. Furthermore, it is also shown that the strategy spaces of the users under realistic conditions must be modified to guarantee the existence of a unique …
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A comparison of two novel channel coding techniques for CDMA
… (AWGN) channels and frequency non-selective Rician Fading (FNRF) channels. The performance of coded CDMA systems in frequency selective Rayleigh fading channels is also analyzed using simulation techniques. Both analytic and simulation results show that by using trellis codes or very low rate …
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An Iterative Confidence Passing Approach for Parameter Estimation and Its Applications to MIMO Systems
… is formed by the coefficients of a Rayleigh or Rician fading channel. Application (a) is for interference-free, cooperative or macro, transmit or receive, diversity scenarios. Application (b) is for MIMO systems with interference-rich reception. Finally, application (c) is for an …
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Mobility Enhancement for Digital Video Broadcast Network Via Satellite
… was carried out using the statistical Rician model to simulate the DVB-S2 and DVB-S2X systems, with results used to quantify the impact of user terminal mobility on system performance. Higher order MODCODs, namely 16APSK, 32APSK, 64APSK, 128APSK, and 256 APSK, were implemented to …
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Topics in complex random matrices and information theory
… the multiple input, multiple output Rayleigh and Rician distributed channels are fully investigated. We consider both correlated and uncorrelated channels and derive the corresponding channel capacity formulas. These studies show how the channel correlations degrade the capacity of the …
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Diversity and MIMO for body-centric wireless communication channels
… analyses. The fast fading envelope best fits the Rician distribution, with moderate K-factor values, and the slow fading envelope best fits the Log-normal distribution. Diversity has been found effective in the BAN-BAN interference rejection and significant rejection gain values are achieved. A …
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Space -Time Transmit Precoding and Interference Suppression for a Wireless Downlink
… consistent with standard models of Rayleigh and Rician fading channels. Optimum strategies that maximize the long term information transfer rate are derived under a variety of assumptions regarding this distribution. It is shown that the simple strategy of beamforming is close to optimal in many …
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Space-Time Codes for High Data Rate Wireless Communications
… to derive performance bounds over Rayleigh, Rician and correlated fading environments. For block-type STC, an analytic framework that supports various complex orthogonal designs with arbitrary signal cardinalities and array configurations is developed. In the second part of the dissertation, …
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A variable-rate modulation and coding scheme for low earth orbit satellites
… gaussian noise conditions and various degrees of Rician and Rayleigh fading. In order to make use of the higher rate QAM constellations, it was necessary to provide the decoder with channel state information. The tested system achieved its purpose of providing a variable rate coding scheme …
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Interference Management in Heterogeneous Cellular Networks
… the interference and performance impact of Rician fading and lognormal shadowing are analytically investigated, first based on the Poisson point process (PPP) model where the locations of BSs in each tier are modeled as a PPP. Second, a hybrid model of HetNets is established which considers …
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Channel Propagation Model for Train to Vehicle Alert System at 5.9 GHz using Dedicated Short Range Communication
… metrics include large scale path loss, Rician small scale fading, Delay spread, and Doppler spread. An analysis of the DSRC performance based on Packet Error Rate is also included.
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Stochastic propagation and planning models for broadband fixed wireless access links
… signal strength, as well as the validity of a Rician distribution in describing the signal envelope variability for both the main and interference links in complex millimetre-wave propagation environments.<br/>
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A Propagation Simulator for Land Mobile Satellite Communications
The performance of a mobile satellite communications link can be determined by the propagation path between a satellite and mobile users. Some of the most important factors are multipath propagation and vegetative shadowing. System designers should have the most reliable information about the …
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Drone Cellular Networks: Fundamentals, Modeling, and Analysis
… channel between UAVs and a ground UE, using a Rician multi-path channel model. We consider two different scenarios for the number of UAVs: (i) single UAV scenario (SUS), and (ii) multiple UAV scenario (MUS). For each scenario, we model UAV wobbling by two random processes, i.e., the Wiener and …