نتایج جستجو برای: fading
تعداد نتایج: 19732 فیلتر نتایج به سال:
In this paper the receiver for demodulation of M-FSK signals in the presence of Gaussian noise, intersymbol interference and Rice fading will be considered. Probability density function (PDF) of M-ary FSK signals in the presence of noise, interference and fading will be derived. Key-words: M-ary Frequency Shift Keying, Probability Density Function, Gaussian noise, Intersymbol Interference, Rice...
We obtain the Shannon capacity of a fading channel with channel side information at the transmitter and receiver, and at the receiver alone. The optimal power adaptation in the former case is “water-pouring” in time, analogous to water-pouring in frequency for time-invariant frequency-selective fading channels. Inverting the channel results in a large capacity penalty in severe fading.
Several theoretical and experimental based models have been proposed to predict the fading envelope of the received signal in multipath condition. In this paper, we considered a model named Nakagami-m model. Nakagami-m can model a variety of fading environments, where it closely approximates the Nakagami-q (Hoyt) and the Nakagami-n (Rice) models, and has the Rayleigh and one sided Gaussian mode...
We consider -ary communication with users over a space diversity channel, consisting of a single transmit antenna for each user and multiple receive antennas. We examine two different flat fading models, namely, phase coherent wavefront fading and noncoherent element-to-element fading. In the case of wavefront fading, the fade is constant across the face of the receive antenna and we can associ...
In this paper, we analyse the performance of dense small cell network (SCNs). We derive analytical expressions for both their coverage probability and their area spectral efficiency (ASE) using a path loss model that considers both line-of-sight (LOS) and non-LOS (NLOS) components. Due to the close proximity of small cell base stations (BSs) and user equipments (UEs) in such dense SCNs, we also...
The capacity of regular noncoherent fading channels grows like log log SNR + χ at high signal-to-noise ratios (SNR). Here, χ, denoted fading number, is a constant independent of the SNR, but dependent on the distribution of the fading process. Recently, an expression of the fading number has been derived for the situation of general memoryless multiple-input multiple-output (MIMO) fading channe...
In this Paper the exact expressions for the Symbol Error Probability (SEP) of Hybrid Selection/Maximal Ratio Combining wireless systems for M-ary QAM are derived and analyzed in multipath fading environment. Independent Rayleigh fading diversity branch is assumed for analysis with equal Signal-to-Noise Ratio averaged over the fading channels and coherent detection of M-ary Quadrature amplitude ...
The average of integer powers of the Gaussian Q-function over fading distributions is commonly found in the evaluation of the average error performance of wireless communication systems over fading channels. Expressions known in the literature for η-μ and κ-μ fading channels only include solutions for the average of one Gaussian Q-function and the product of two Gaussian Q-functions. This Lette...
The ergodic capacity of various fading channels such as Rayleigh and Rician fading channels has been studied for a long time [1], [2]. Some closed-form expressions of the fading channel capacity have been obtained in terms of a higher transcend function of Meijer’s G function [3] or triple summations of the Poisson distribution [2]. Unfortunately, those representations are somewhat complex and ...
We consider a game-theoretic power control algorithm for wireless data realistic channels. We study the performance of the algorithm for wireless data in the fast, flat-fading channel mobile users encounter in accessing the cellular system. The game-theoretic power control algorithm depends on an average utility function that assigns a numerical value to the quality of service (QoS) of users. T...
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