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On the maximum and minimum of two modified Gamma-Gamma variates with applications

On the maximum and minimum of two modified Gamma-Gamma varia...

引用

IEEE Conference on Wireless Communications and Networking

作者： Hessa AlQuwaiee Imran Shafique Ansari Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Kingdom of Saudi Arabia

In this work, we derive the statistical characteristics of the maximum and the minimum of two modified 1 Gamma-Gamma variates in closed-form in terms of Meijer's G-function and the extended generalized bivariate Meijer's G-function. Then, we rely on these new results to present the performance analysis of (i) a dual-branch free-space optical selection combining diversity undergoing independent but not necessarily identically distributed Gamma-Gamma fading under the impact of pointing errors and of (ii) a dual-hop free-space optical relay transmission system. computer-based Monte-Carlo simulations verify our new analytical results.

关键词： Radio frequency Signal to noise ratio Bit error rate Relays Diversity reception Optical transmitters

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On the symbol error rate of M-ary MPSK over generalized fading channels with additive Laplacian noise

On the symbol error rate of M-ary MPSK over generalized fadi...

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IEEE International Symposium on Information Theory

作者： Hamza Soury Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Kingdom of Saudi Arabia

This paper considers the symbol error rate of M-ary phase shift keying (MPSK) constellations over extended Generalized-K fading with Laplacian noise and using a minimum distance detector. A generic closed form expression of the conditional and the average probability of error is obtained and simplified in terms of the Fox's H function. More simplifications to well known functions for some special cases of fading are also presented. Finally, the mathematical formalism is validated with some numerical results examples done by computer based simulations.

关键词： Detectors Rayleigh channels Probability density function Signal to noise ratio Information theory

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On the low SNR capacity of log-normal turbulence channels with full CSI

On the low SNR capacity of log-normal turbulence channels wi...

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International Workshop on Optical Wireless Communications

作者： Fatma Benkhelifa Abdoulaye Tall Zouheir Rezki Mohamed-Slim Alouini Computer Electrical and Mathematical Science and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Saudi Arabia Orange Labs France

In this paper, we characterize the low signal-to-noise ratio (SNR) capacity of wireless links undergoing the log-normal turbulence when the channel state information (CSI) is perfectly known at both the transmitter and the receiver. We derive a closed form asymptotic expression of the capacity and we show that it scales essentially as λ SNR where λ is the water-filling level satisfying the power constraint. An asymptotically closed-form expression of λ is also provided. Using this framework, we also propose an on-off power control scheme which is capacity-achieving in the low SNR regime.

关键词： Signal to noise ratio Integrated optics Tin Reactive power

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Performance of BICM-T transceivers over Gaussian mixture noise channels

Performance of BICM-T transceivers over Gaussian mixture noi...

引用

IEEE Conference on Wireless Communications and Networking

作者： Muhammad Talha Malik Md. Jahangir Hossain Mohamed-Slim Alouini School of Engineering The University of British Columbia Kelowna BC Canada Computer Electrical and Mathematical Science and Engineering (CEMSE) Division King Abdullah University of Science & Technology (KAUST) Makkah Saudia Arabia

Experimental measurements have shown that the noise in many communication channels is non-Gaussian. Bit interleaved coded modulation (BICM) is very popular for spectrally efficient transmission. Recent results have shown that the performance of BICM using convolutional codes in non-fading channels can be significantly improved if the coded bits are not interleaved at all. This particular BICM design is called BICM trivial (BICM-T). In this paper, we analyze the performance of a generalized BICM-T design for communication over Gaussian mixture noise (GMN) channels. The results disclose that for an optimal bit error rate (BER) performance, the use of an interleaver in BICM for GMN channels depends upon the strength of the impulsive noise components in the Gaussian mixture. The results presented for 16-QAM show that the BICM-T can result in gains up to 1.5 dB for a target BER of 10 -6 if the impulsive noise in the Gaussian mixture is below a certain threshold level. The simulation results verify the tightness of developed union bound (UB) on BER performance.

关键词： Noise Bit error rate Receivers Decoding Noise measurement Constellation diagram

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BICM-Based Cooperative Communication Systems with Relay Selection: Constellation and Multiplexer Design

BICM-Based Cooperative Communication Systems with Relay Sele...

引用

IEEE Conference on Vehicular technology (VTC)

We propose a new bit-interleaved coded modulation (BICM)-based cooperative communication system where different BICM modules can be optimized jointly considering the average signal to noise ratios of the direct and the two-hop Rayleigh fading channels. As such, the full benefit of BICM can be exploited in the context of cooperative communication. Our design considers cooperative communication systems with so called max-min relay selection scheme that has no loss in performance in terms of diversity-multiplexing trade off in orthogonal cooperation. The presented numerical results for rate 1/2 convolutional code with 8-ary pulse amplitude modulation equivalently 64-ary quadrature amplitude modulation show that the proposed design can offer gains up to 1.4 dB over the traditional BICM design for a target bit error rate of 10 -6 . Moreover the results show that the amount of gain depends on the relays' positions and increases with the number of relays available for selection.

关键词： Relays Bit error rate Cooperative communication Multiplexing Signal to noise ratio Optimization Modulation

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On the low SNR capacity of MIMO fading channels with imperfect channel state information

On the low SNR capacity of MIMO fading channels with imperfe...

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International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt)

ISBN: (纸本)9781479953059

The capacity of Multiple Input Multiple Output (MIMO) Rayleigh fading channels with full knowledge of channel state information (CSI) at both the transmitter and the receiver (CSI-TR) has been shown recently to scale at low Signal-to-Noise Ratio (SNR) essentially as SNR log(1=SNR), independently of the number of transmit and receive antennas. In this paper, we investigate the ergodic capacity of MIMO Rayleigh fading channel with estimated channel state information at the transmitter (CSI-T) and possibly imperfect channel state information at the receiver (CSI-R). Our framework can be seen as a generalization of previous works as it can capture the perfect CSI-TR as a special case when the estimation error variance goes to zero. In our work, we mainly focus on the low SNR regime and we show that the capacity scales as (1-α) SNR log(1=SNR), where α is the estimation error variance. This characterization shows the loss of performance due to error estimation over the perfect channel state information at both the transmitter and the receiver. As a by-product of our new analysis, we show that our framework can also be extended to characterize the capacity of MIMO Rician fading channels at low SNR with possibly imperfect CSI-T and CSI-R.

关键词： Signal to noise ratio Fading Noise measurement Rician channels

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Mobile Sensor Networks for Leak and Backflow Detection in Water Distribution Systems

Mobile Sensor Networks for Leak and Backflow Detection in Wa...

引用

IEEE International Conference on Advanced Information Networking and Applications

作者： M. Agumbe Suresh L. Smith A. Rasekh R. Stoleru M. K. Banks B. Shihada Department of Computer Science and Engineering Texas A&M University Department of Civil Engineering Texas A&M University Department of Computer Science King Abdullah University of Science and Technology

ISBN: (纸本)9781479936311

Leak and backflow detection are essential aspects of Water Distribution System (WDS) monitoring. Most existing solutions for leak/backflow detection in WDSs focus on the placement of expensive static sensors located strategically. In contrast to these, we propose a solution whereby mobile sensors (i.e., their movement aided only by the inherent water flow in the system) detect leaks/backflow. Information about the leaks/backflow is collected from the sensors either by physically capturing them, or through wireless communication. Specifically, we propose models to maximize leak/backflow detection given a cost constraint (a limit on the number of sensors). Through extensive simulations, we demonstrate the superior performance of our proposed solution when compared with the state of the art solutions (e.g., algorithms/protocols and analysis).

关键词： Backflow Water WDS

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A discontinuous galerkin time domain-boundary integral method for analyzing transient electromagnetic scattering

A discontinuous galerkin time domain-boundary integral metho...

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Antennas and Propagation Society International Symposium

作者： Ping Li Li Jun Jiang Yifei Shi Hakan Bağcı Dept. of Electrical and Electronic Engineering The University of Hong Kong Hong Kong China Dept. of Computer Electrical King Abdullah University of Science and Technology Thuwal Saudi Arabia

This paper presents an algorithm hybridizing discontinuous Galerkin time domain (DGTD) method and time domain boundary integral (BI) algorithm for 3-D open region electromagnetic scattering analysis. The computational domain of DGTD is rigorously truncated by analytically evaluating the incoming numerical flux from the outside of the truncation boundary through BI method based on the Huygens' principle. The advantages of the proposed method are that it allows the truncation boundary to be conformal to arbitrary (convex/ concave) scattering objects, well-separated scatters can be truncated by their local meshes without losing the physics (such as coupling/multiple scattering) of the problem, thus reducing the total mesh elements. Furthermore, low frequency waves can be efficiently absorbed, and the field outside the truncation domain can be conveniently calculated using the same BI formulation. Numerical examples are benchmarked to demonstrate the accuracy and versatility of the proposed method.

关键词： Bismuth Time-domain analysis Method of moments Electromagnetic scattering Equations Mathematical model

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A FMM-FFT accelerated hybrid volume surface integral equation solver for electromagnetic analysis of re-entry space vehicles

A FMM-FFT accelerated hybrid volume surface integral equatio...

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USNC-URSI Radio science Meeting (Joint with AP-S Symposium)

作者： Abdulkadir C. Yücel Luis J. Gomez Yang Liu Hakan Bağcı Eric Michielssen University of Michigan Ann Arbor MI US Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA King Abdullah University of Science and Technology Thuwal SA

Summary form only given. Space vehicles that re-enter the atmosphere often experience communication blackout. The blackout occurs when the vehicle becomes engulfed in plasma produced by interactions between the vehicle surface and the atmosphere. The plasma often is concentrated in a relatively thin shell around the vehicle, with higher densities near its nose than rear. A less structured, sometimes turbulent plasma wake often trails the vehicle. The plasma shell severely affects the performance of side-mounted antennas as it alters their characteristics (frequency response, gain patterns, axial ratio, and impedance) away from nominal, free-space values, sometimes entirely shielding the antenna from the outside world. The plasma plume/turbulent wake similarly affect the performance of antennas mounted at the back of the vehicle. The electromagnetic characteristics of the thin plasma shell and plume/turbulent wake heavily depend on the type of re-entry trajectory, the vehicle's speed, angles of attack, and chemical composition, as well as environmental conditions. To analyze the antennas' performance during blackout and to design robust communication antennas, efficient and accurate simulation tools for charactering the antennas' performance along the trajectory are called for.

关键词： Antennas Plasmas Surface impedance Space vehicles Computational modeling

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Transmit power optimization for green multihop relaying over Nakagami-m fading channels

Transmit power optimization for green multihop relaying over...

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International Conference on Communications and Networking, ComNet

作者： Itsikiantsoa Randrianantenaina Mustapha Benjillali Mohamed-Slim Alouini Computer Electrical and Mathematical Science and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia Communication Systems Department INPT Rabat Morocco

In this paper, we investigate the optimal transmit power strategy to maximize the energy efficiency of a multihop relaying network. Considering the communication between a source and a destination through multiple Amplify-and-Forward relays, we first give the expression of the total instantaneous system energy consumption. Then, we define the energy efficiency in our context and obtain its expression in closed-form when the communication is over Nakagami-m fading channels. The analysis yields to the derivation of a global transmit power strategy where each individual node is contributing to the end-to-end overall energy efficiency. Numercial results are presented to illustrate the analysis. Comparison with Monte Carlo simulation results confirms the accuracy of our derivations, and assesses the gains of the proposed power optimization strategy.

关键词： Relays Fading Energy consumption Wireless communication Signal to noise ratio Resource management Green products

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