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On the Degrees-of-Freedom of the MIMO Three-Way Channel with Intermittent ConnectivityJan 27 2017The degrees-of-freedom (DoF) of the multi-antenna three-way channel (3WC) with an intermittent node is studied. Special attention is given to the impact of adaptation. A nonadaptive transmission scheme based on interference alignment, zero-forcing, and ... More

Spectrum Sharing Opportunities of Full-Duplex Systems using Improper Gaussian SignalingOct 10 2015Sharing the licensed spectrum of full-duplex (FD) primary users (PU) brings strict limitations on the underlay cognitive radio operation. Particularly, the self interference may overwhelm the PU receiver and limit the opportunity of secondary users (SU) ... More

A QoS-Oriented Trajectory Optimization in Swarming Unmanned-Aerial-Vehicles CommunicationsApr 16 2019This letter aims to present a novel approach for unmanned aerial vehicles (UAV)' path planning with respect to certain quality of service requirements. More specifically, we study the max-min fairness problem in an air-to-ground communication system where ... More

In-Band $α$-Duplex Scheme for Cellular Networks: A Stochastic Geometry ApproachSep 03 2015Jul 11 2016In-band full-duplex (FD) communications have been optimistically promoted to improve the spectrum utilization and efficiency. However, the penetration of FD communications to the cellular networks domain is challenging due to the imposed uplink/downlink ... More

In-Band Full-Duplex Communications for Cellular Networks with Partial Uplink/Downlink OverlapAug 12 2015Aug 25 2015In-band full-duplex (FD) communications have been optimistically promoted to improve the spectrum utilization in cellular networks. However, the explicit impact of spatial interference, imposed by FD communications, on uplink and downlink transmissions ... More

A Novel Error Performance Analysis Methodology for OFDM-IMFeb 17 2019Orthogonal frequency-division multiplexing with index modulation (OFDM-IM) has become a high-profile candidate for the modulation scheme in next generation networks, and many works have been published to analyze it in recent years. Error performance is ... More

Over-Sampling Codebook-Based Hybrid Minimum Sum-Mean-Square-Error Precoding for Millimeter-Wave 3D-MIMOMay 21 2018Hybrid precoding design is challenging for millimeter-wave (mmWave) massive MIMO. Most prior hybrid precoding schemes are designed to maximize the sum spectral efficiency (SSE), while seldom investigate the bit-error-rate (BER). Therefore, we propose ... More

Secure mmWave Communications in Cognitive Radio NetworksApr 12 2019In this letter, the secrecy performance in cognitive radio networks (CRNs) over fluctuating two-ray (FTR) channels, which is used to model the millimetre wave channel, is investigated in terms of the secrecy outage probability (SOP). Specifically, we ... More

Aeronautical Data Aggregation and Field Estimation in IoT Networks: Hovering & Traveling Time Dilemma of UAVsOct 18 2018The next era of information revolution will rely on aggregating big data from massive numbers of devices that are widely scattered in our environment. Most of these devices are expected to be of low-complexity, low-cost, and limited power supply, which ... More

Technical Report: Finger Replacement Schemes for RAKE Receivers in the Soft Handover Region with Multiple BSs over I.N.D. Fading ChannelsNov 28 2014A new finger replacement technique which is applicable for RAKE receivers in the soft handover (SHO) region has been proposed and studied in [1], [2] under the ideal assumption that the fading is both independent and identically distributed from path ... More

Communication Through Breath: Aerosol TransmissionNov 04 2018Exhaled breath can be used in retrieving information and creating innovative communication systems. It contains several volatile organic compounds (VOCs) and biological entities that can act as health biomarkers. For instance, the breath of infected human ... More

Well and ill-posedness issues for energy supercritical wavesJun 17 2009We investigate the initial value problem for some energy supercritical semilinear wave equations. We establish local existence in suitable spaces with continuous flow. We also obtain some ill-posedness/weak ill-posedness results. The proof uses the finite ... More

On Lattice Sequential Decoding for The Unconstrained AWGN ChannelOct 01 2012Apr 09 2013In this paper, the performance limits and the computational complexity of the lattice sequential decoder are analyzed for the unconstrained additive white Gaussian noise channel. The performance analysis available in the literature for such a channel ... More

The random matrix regime of Maronna's M-estimator for observations corrupted by elliptical noisesDec 29 2014This article studies the behavior of the Maronna robust scatter estimator $\hat{C}_N\in \mathbb{C}^{N\times N}$ of a sequence of observations $y_1,...,y_n$ which is composed of a $K$ dimensional signal drown in a heavy tailed noise, i.e $y_i=A_N s_i+x_i$ ... More

A Unified MGF-Based Capacity Analysis of Diversity Combiners over Generalized Fading ChannelsDec 12 2010Unified exact average capacity results for L-branch coherent diversity receivers including equal-gain combining (EGC) and maximal-ratio combining (MRC) are not known. This paper develops a novel generic framework for the capacity analysis of $L$-branch ... More

Novel Relations between the Ergodic Capacity and the Average Bit Error RateJan 05 2012Ergodic capacity and average bit error rate have been widely used to compare the performance of different wireless communication systems. As such recent scientific research and studies revealed strong impact of designing and implementing wireless technologies ... More

Secure Diversity-Multiplexing Tradeoff of Zero-Forcing Transmit Scheme at Finite-SNRDec 27 2011In this paper, we address the finite Signal-to-Noise Ratio (SNR) Diversity-Multiplexing Tradeoff (DMT) of the Multiple Input Multiple Output (MIMO) wiretap channel, where a Zero-Forcing (ZF) transmit scheme, that intends to send the secret information ... More

A Novel Unified Expression for the Capacity and Bit Error Probability of Wireless Communication Systems over Generalized Fading ChannelsJan 26 2011Analysis of the average binary error probabilities (ABEP) and average capacity (AC) of wireless communications systems over generalized fading channels have been considered separately in the past. This paper introduces a novel moment generating function ... More

Extended Generalized-K (EGK): A New Simple and General Model for Composite Fading ChannelsDec 12 2010In this paper, we introduce a generalized composite fading distribution (termed extended generalized-K (EGK)) to model the envelope and the power of the received signal in millimeter wave (60 GHz or above) and free-space optical channels. We obtain the ... More

New Results On the Sum of Two Generalized Gaussian Random VariablesMay 31 2015We propose in this paper a new method to compute the characteristic function (CF) of generalized Gaussian (GG) random variable in terms of the Fox H function. The CF of the sum of two independent GG random variables is then deduced. Based on this results, ... More

On the Capacity of Multiple Access and Broadcast Fading Channels with Full Channel State Information at Low SNROct 29 2013We study the throughput capacity region of the Gaussian multi-access (MAC) fading channel with perfect channel state information (CSI) at the receiver and at the transmitters, at low power regime. We show that it has a multidimensional rectangle structure ... More

A Novel Ergodic Capacity Analysis of Diversity Combining and Multihop Transmission Systems over Generalized Composite Fading ChannelsJul 07 2012Ergodic capacity is an important performance measure associated with reliable communication at the highest rate at which information can be sent over the channel with a negligible probability of error. In the shadow of this definition, diversity receivers ... More

On the Computation of the Higher Order Statistics of the Channel Capacity over Generalized Fading ChannelsApr 17 2012Jul 27 2012The higher-order statistics (HOS) of the channel capacity $\mu_n=\mathbb{E}[\log^n(1+\gamma_{end})]$, where $n\in\mathbb{N}$ denotes the order of the statistics, has received relatively little attention in the literature, due in part to the intractability ... More

Ergodic Capacity of Cognitive Radio under Imperfect Channel State InformationApr 10 2012A spectrum-sharing communication system where the secondary user is aware of the instantaneous channel state information (CSI) of the secondary link, but knows only the statistics and an estimated version of the secondary transmitter-primary receiver ... More

Exact Performance Analysis of Partial Relay Selection Based on Shadowing Side Information over Generalized Composite Fading ChannelsSep 29 2011Jul 10 2012Relay technology has recently gained great interest in millimeter wave (60 GHz or above) radio frequencies as a promising transmission technique improving the quality of service, providing high data rate, and extending the coverage area without additional ... More

On Low-Complexity Full-diversity Detection In Multi-User MIMO Multiple-Access ChannelsJan 20 2014Jun 20 2014Multiple-input multiple-output (MIMO) techniques are becoming commonplace in recent wireless communication standards. This added dimension (i.e., space) can be efficiently used to mitigate the interference in the multi-user MIMO context. In this paper, ... More

Limits on the Capacity of In-Band Full Duplex Communication in Uplink Cellular NetworksNov 17 2015Simultaneous co-channel transmission and reception, denoted as in-band full duplex (FD) communication, has been promoted as an attractive solution to improve the spectral efficiency of cellular networks. However, in addition to the self-interference problem, ... More

Harvesting Full-Duplex Rate Gains in Cellular Networks with Half-Duplex User TerminalsNov 01 2015Feb 28 2016Full-Duplex (FD) transceivers may be expensive in terms of complexity, power consumption, and price to be implemented in all user terminals. Therefore, techniques to exploit in-band full-duplex communication with FD base stations (BSs) and half-duplex ... More

On the Performance of Millimeter Wave-based RF-FSO Links with HARQ FeedbackMar 26 2016This paper studies the performance of hybrid radio-frequency (RF) and free-space optical (FSO) links in the cases with and without hybrid automatic repeat request (HARQ). Considering millimeter wave (mmwave) characteristics in the RF link and pointing ... More

Resource Allocation via Sum-Rate Maximization in the Uplink of Multi-Cell OFDMA NetworksOct 13 2010Sep 21 2011In this paper, we consider maximizing the sum-rate in the uplink of a multi-cell OFDMA network. The problem has a non-convex combinatorial structure and is known to be NP hard. Due to the inherent complexity of implementing the optimal solution, firstly, ... More

Performance Analysis of Hybrid ARQ with Incremental Redundancy over Amplify-and-Forward Dual-Hop Relay ChannelsApr 08 2014In this paper, we consider a three node relay network comprising a source, a relay, and a destination. The source transmits the message to the destination using hybrid automatic repeat request (HARQ) with incremental redundancy (IR). The relay overhears ... More

On the Secrecy Capacity of the Broadcast Wiretap Channel with Limited CSI FeedbackMar 22 2016Mar 23 2016In this paper, we investigate the problem of secure broadcasting over block-fading channels with limited channel knowledge at the transmitter. More particularly, we analyze the effect of having imperfect channel state information (CSI) via a finite rate ... More

Consumption Factor Optimization for Multihop Relaying over Nakagami-m Fading channelsNov 19 2014In this paper, the energy efficiency of multihop relaying over Nakagami-$m$ fading channels is investigated. The "consumption factor" is used as a metric to evaluate the energy efficiency, and it is derived in closed-form for both amplify-and-forward ... More

A Unified Framework for the Ergodic Capacity of Spectrum Sharing Cognitive Radio SystemsNov 28 2012We consider a spectrum sharing communication scenario in which a primary and a secondary users are communicating, simultaneously, with their respective destinations using the same frequency carrier. Both optimal power profile and ergodic capacity are ... More

MIMO Capacity with Reduced RF ChainsJan 12 2019Feb 07 2019This paper presents a remarkable advance for the understanding of MIMO capacity limits with insufficient RF chains. The capacity is characterized by the maximum mutual information given any vector inputs subject to not only an average power constraint ... More

High SNR BER Comparison of Coherent and Differentially Coherent Modulation Schemes in Lognormal Fading ChannelsJul 26 2014Using an auxiliary random variable technique, we prove that binary differential phase-shift keying and binary phase-shift keying have the same asymptotic bit-error rate performance in lognormal fading channels. We also show that differential quaternary ... More

Toward Spectral and Energy Efficient 5G Networks Using Relayed OFDM with Index ModulationApr 09 2019Next generation wireless networks are expected to provide much higher data throughput and reliable connections for a far larger number of wireless service subscribers and machine-type nodes, which result in increasingly stringent requirements of spectral ... More

Precoding design for single-RF massive MIMO systems: A large system analysisMay 15 2016Jun 01 2016This work revisits a recently proposed precoding design for massive multiple-input multiple output (MIMO) systems that is based on the use of an instantaneous total power constraint. The main advantages of this technique lie in its suitability to single ... More

Efficient Incremental RelayingDec 22 2012Jan 27 2013We propose a novel relaying scheme which improves the spectral efficiency of cooperative diversity systems by utilizing limited feedback from destination. Our scheme capitalizes on the fact that relaying is only required when direct transmission suffers ... More

Multiuser Switched Diversity Scheduling SchemesApr 12 2012Multiuser switched-diversity scheduling schemes were recently proposed in order to overcome the heavy feedback requirements of conventional opportunistic scheduling schemes by applying a threshold-based, distributed, and ordered scheduling mechanism. ... More

On The Construction of Capacity-Achieving Lattice Gaussian CodesFeb 03 2016In this paper, we propose a new approach to proving results regarding channel coding schemes based on construction-A lattices for the Additive White Gaussian Noise (AWGN) channel that yields new characterizations of the code construction parameters, i.e., ... More

On the Low SNR Capacity of Maximum Ratio Combining over Rician Fading Channels with Full Channel State InformationJan 04 2013In this letter, we study the ergodic capacity of a maximum ratio combining (MRC) Rician fading channel with full channel state information (CSI) at the transmitter and at the receiver. We focus on the low Signal-to-Noise Ratio (SNR) regime and we show ... More

Wireless Data Center Networks: Advances, Challenges, and OpportunitiesNov 28 2018Data center networks (DCNs) are essential infrastructures to embrace the era of highly diversified massive amount of data generated by emerging technological applications. In order to store and process such a data deluge, today's DCNs have to deploy enormous ... More

Rician $K$-Factor-Based Analysis of XLOS Service Probability in 5G Outdoor Ultra-Dense NetworksApr 22 2018Apr 29 2018In this report, we introduce the concept of Rician $K$-factor-based radio resource and mobility management for fifth generation (5G) ultra-dense networks (UDN), where the information on the gradual visibility between the new radio node B (gNB) and the ... More

Different Power Adaption Methods on Fluctuating Two-Ray Fading ChannelsNov 12 2018In this letter, we consider a typical scenario where the transmitter employs different power adaption methods, including the optimal rate and power algorithm, optimal rate adaption, channel inversion and truncated channel inversion, to enhance the ergodic ... More

Flexible Design for $α$-Duplex Communications in Multi-Tier Cellular NetworksNov 24 2015Apr 20 2016Backward compatibility is an essential ingredient for the success of new technologies. In the context of in-band full-duplex (FD) communication, FD base stations (BSs) should support half-duplex (HD) users' equipment (UEs) without sacrificing the foreseen ... More

On the Computation of the Higher-Order Statistics of the Channel Capacity for Amplify-and-Forward Multihop TransmissionJun 02 2012Aug 20 2012Higher-order statistics (HOS) of the channel capacity provide useful information regarding the level of reliability of the signal transmission at a particular rate. We propose in this letter a novel and unified analysis, which is based on the moment-generating ... More

Joint Filter Design of Alternate MIMO AF Relaying Networks with Interference AlignmentJul 16 2012We study in this paper a two-hop relaying network consisting of one source, one destination, and three amplify-and-forward (AF) relays operating in a half-duplex mode. In order to compensate for the inherent loss of capacity pre-log factor 1/2 in a half-duplex ... More

Well posedness and unconditional non uniqueness for a 2D semilinear heat equationAug 14 2010We investigate the initial value problem for a semilinear heat equation with exponential-growth nonlinearity in two space dimension. First, we prove the local existence and unconditional uniqueness of solutions in the Sobolev space $H^1(\R^2)$. The uniqueness ... More

Energy Critical NLS in two space dimensionsJun 18 2008We investigate the initial value problem for a defocusing nonlinear Schr\"odingerequation with exponential nonlinearity. We identify subcritical, critical and supercritical regimes in the energy space. We establish global well-posedness in the subcritical ... More

Optimal Transmit Power Allocation for MIMO Two-Way Cognitive Relay Networks with Multiple RelaysSep 29 2013Nov 04 2013In this letter, we consider a multiple-input multiple-output two-way cognitive radio system under a spectrum sharing scenario, where primary and secondary users operate on the same frequency band. The secondary terminals aims to exchange different messages ... More

Relay Selection and Resource Allocation for Two Way DF-AF Cognitive Radio NetworksMar 14 2013May 19 2013In this letter, the problem of optimal resource power allocation and relay selection for two way relaying cognitive radio networks using half duplex Decode and Forward (DF) and Amplify and Forward (AF) systems are investigated. The primary and secondary ... More

Energy scattering for 2D critical wave equationJun 19 2008We investigate existence and asymptotic completeness of the wave operators for nonlinear Klein-Gordon and Schr\"odinger equations with a defocusing exponential nonlinearity in two space dimensions. A certain threshold is defined based on the value of ... More

Improper Gaussian Signaling in Full-Duplex Relay Channels with Residual Self-InterferenceJan 04 2016Mar 02 2016We study the potential employment of improper Gaussian signaling (IGS) in full-duplex cooperative settings with residual self-interference (RSI). IGS is recently shown to outperform traditional proper Gaussian signaling (PGS) in several interference-limited ... More

Sharing the Licensed Spectrum of Full-Duplex Systems using Improper Gaussian SignalingOct 10 2015Sharing the spectrum with in-band full-duplex (FD) primary users (PU) is a challenging and interesting problem in the underlay cognitive radio (CR) systems. The self-interference introduced at the primary network may dramatically impede the secondary ... More

Improper Signaling in Two-Path Relay ChannelsDec 17 2016Mar 07 2017Inter-relay interference (IRI) challenges the operation of two-path relaying systems. Furthermore, the unavailability of the channel state information (CSI) at the source and the limited detection capabilities at the relays prevent neither eliminating ... More

Improper Signaling for Virtual Full-Duplex Relay SystemsFeb 14 2017Virtual full-duplex (VFD) is a powerful solution to compensate the rate loss of half-duplex relaying without the need to full-duplex capable nodes. Inter-relay interference (IRI) challenges the operation of VFD relaying systems. Recently, improper signaling ... More

Underlay Spectrum Sharing Techniques with In-band Full-Duplex Systems using Improper Gaussian SignalingJan 03 2016Sharing the spectrum with in-band full-duplex (FD) primary users (PU) is a challenging and interesting problem in the underlay cognitive radio (CR) systems. The self-interference introduced at the primary network may dramatically impede the secondary ... More

FSO-based Vertical Backhaul/Fronthaul Framework for 5G+ Wireless NetworksJul 06 2016The presence of a high-rate, but also cost-efficient and scalable, backhaul/fronthaul framework is essential in the upcoming fifth-generation (5G) wireless networks & beyond to facilitate the anticipated explosive growth in the number of various types ... More

FSO-based Vertical Backhaul/Fronthaul Framework for 5G+ Wireless NetworksJul 06 2016May 04 2017The presence of a super high rate, but also cost-efficient, easy-to-deploy, and scalable, backhaul/fronthaul framework is essential in the upcoming fifth-generation (5G) wireless networks \& beyond. Motivated by the mounting interest in the unmanned flying ... More

Transmit Antenna Selection in Underlay Cognitive Radio EnvironmentApr 20 2014Jul 30 2014Cognitive radio (CR) technology addresses the problem of spectrum under-utilization. In underlay CR mode, the secondary users are allowed to communicate provided that their transmission is not detrimental to primary user communication. Transmit antenna ... More

Unified Performance Analysis of Mixed Line of Sight RF-FSO Fixed Gain Dual-Hop Transmission SystemsMar 31 2014In this work, we carry out a unified performance analysis of a dual-hop fixed gain relay system over asymmetric links composed of both radio-frequency (RF) and unified free-space optics (FSO) under the effect of pointing errors. The RF link is modeled ... More

Power Allocation Strategies for Fixed-Gain Half-Duplex Amplify-and-Forward Relaying in Nakagami-m FadingNov 26 2012Dec 16 2012In this paper, we study power allocation strategies for a fixed-gain amplify-and-forward relay network employing multiple relays. We consider two optimization problems for the relay network: 1) optimal power allocation to maximize the end-to-end signal-to-noise ... More

An Intercell Interference Model based on Scheduling for Future Generation Wireless Networks (Part 1 and Part 2)Jun 11 2012Jun 13 2012This technical report is divided into two parts. The first part of the technical report presents a novel framework for modeling the uplink and downlink intercell interference (ICI) in a multiuser cellular network. The proposed framework assists in quantifying ... More

Towards the Internet of X-things: New Possibilities for Underwater, Underground, and Outer Space ExplorationMar 28 2019Apr 02 2019The rapid growth of the world's population demands more natural resources, food, and space. World-renowned physicist Stephan Hawking has argued that soon we will require another world to live on because we are running out of space and natural resources. ... More

Optimal Linear Precoding for Indoor Visible Light Communication SystemAug 06 2017Visible light communication (VLC) is an emerging technique that uses light-emitting diodes (LED) to combine communication and illumination. It is considered as a promising scheme for indoor wireless communication that can be deployed at reduced costs ... More

Optimal Design of the Adaptive Normalized Matched Filter DetectorJan 24 2015May 14 2015This article addresses improvements on the design of the adaptive normalized matched filter (ANMF) for radar detection. It is well-acknowledged that the estimation of the noise-clutter covariance matrix is a fundamental step in adaptive radar detection. ... More

Degrees-of-Freedom of the MIMO Three-Way Channel with Node-IntermittencyAug 28 2017The characterization of fundamental performance bounds of many-to-many communication systems in which participating nodes are active in an intermittent way is one of the major challenges in communication theory. In order to address this issue, we introduce ... More

Technical Report: Beaconless Geo-Routing Under The Spotlight: Practical Link Models and Application ScenariosJan 16 2013Analysis and simulation of beaconless geo-routing protocols have been traditionally conducted assuming equal communication ranges for the data and control packets. In reality, this is not true since the communication range is actually function of the ... More

Technical Report: Multi-Carrier Position-Based Packet Forwarding Protocol For Wireless Sensor NetworksAug 09 2011Sep 07 2011Beaconless position-based forwarding protocols have recently evolved as a promising solution for packet forwarding in wireless sensor networks. However, as the node density grows, the overhead incurred in the process of relay selection grows significantly. ... More

Eficient Monte Carlo Simulation of the Left Tail of Positive Gaussian Quadratic FormsJan 26 2019Estimating the left tail of quadratic forms in Gaussian random vectors is of major practical importance in many applications. In this paper, we propose an efficient and robust importance sampling estimator that is endowed with the bounded relative error ... More

On Achievable Accuracy of Localization in Magnetic Induction-Based Internet of Underground Things for Oil and Gas ReservoirsJan 28 2019Magnetic Induction (MI) is an efficient wireless communication method to deploy operational internet of underground things (IOUT) for oil and gas reservoirs. The IOUT consists of underground things which are capable of sensing the underground environment ... More

Towards the Internet of Underground Things: A Systematic SurveyFeb 11 2019This paper provides recent advances in the area of Internet of Underground Things (IoUT) with emphasis on enabling communication technologies, networking issues, and localization techniques. IoUT is enabled by underground things (sensors), communication ... More

To boldly go where no sensor has gone before: The movement to place IoT in radical new spacesMar 28 2019In this article, we have presented an overview on a unified framework which is called as the Internet of X-things (X-IoT) that will warrant the convergence of emerging use cases of the Internet of Things everywhere around us, i.e., under the ground and ... More

On the Performance of Millimeter Wave-based RF-FSO Multi-hop and Mesh NetworksMar 27 2017This paper studies the performance of multi-hop and mesh networks composed of millimeter wave (MMW)-based radio frequency (RF) and free-space optical (FSO) links. The results are obtained in cases with and without hybrid automatic repeat request (HARQ). ... More

Performance of Amplify-and-Forward Multihop Transmission over Relay Clusters with Different Routing StrategiesFeb 17 2012We Consider a multihop relay network in which two terminals are communicating with each other via a number of cluster of relays. Performance of such networks depends on the routing protocols employed. In this paper, we find the expressions for the average ... More

Ordered Sequence Detection and Barrier Signal Design for Digital Pulse Interval Modulation in Optical Wireless CommunicationsApr 12 2018Dec 26 2018This paper proposes an ordered sequence detection (OSD) for digital pulse interval modulation (DPIM) in optical wireless communications. Leveraging the sparsity of DPIM sequences, OSD shows comparable performance to the optimal maximum likelihood sequence ... More

Learn to Fly: A Distributed Mechanism for Joint 3D Placement and Users Association in UAVs-assisted NetworksOct 15 2018In this paper, we study the joint 3D placement of unmanned aerial vehicles (UAVs) and UAVs-users association under bandwidth limitation and quality of service constraint. In particular, in order to allow to UAVs to dynamically improve their 3D locations ... More

Secret-Key Agreement with Public Discussion subject to an Amplitude ConstraintApr 01 2016This paper considers the problem of secret-key agreement with public discussion subject to a peak power constraint $A$ on the channel input. The optimal input distribution is proved to be discrete with finite support. The result is obtained by first transforming ... More

An Improved Hazard Rate Twisting Approach for the Statistic of the Sum of Subexponential Variates (Extended Version)Nov 16 2014Apr 09 2015In this letter, we present an improved hazard rate twisting technique for the estimation of the probability that a sum of independent but not necessarily identically distributed subexponential Random Variables (RVs) exceeds a given threshold. Instead ... More

On the Efficient Simulation of the Left-Tail of the Sum of Correlated Log-normal VariatesMay 22 2017May 26 2017The sum of Log-normal variates is encountered in many challenging applications such as in performance analysis of wireless communication systems and in financial engineering. Several approximation methods have been developed in the literature, the accuracy ... More

Can Uplink Transmissions Survive in Full-duplex Cellular Environments?Apr 09 2016In-band full-duplex (FD) communication is considered a potential candidate to be adopted by the fifth generation (5G) cellular networks. FD communication renders the entire spectrum simultaneously accessible by uplink and downlink, and hence, is optimistically ... More

On the Capacity of Fading Channels with Peak and Average Power Constraints at Low SNRApr 18 2018Nov 19 2018The capacity of fading channels under peak and average power constraints in the low-SNR regime is investigated. We show that the capacity scales essentially as ${C \approx A \ \text{SNR} \int_{1- \frac{1}{A}}^1 F^{-1}\left(t\right)dt}$, where $A$ is the ... More

Energy-Efficient Cooperative Protocols for Full-Duplex Relay ChannelsOct 17 2013In this work, energy-efficient cooperative protocols are studied for full-duplex relaying (FDR) with loopback interference. In these protocols, relay assistance is only sought under certain conditions on the different link outages to ensure effective ... More

A Framework for Uplink Intercell Interference Modeling with Channel-Based SchedulingNov 19 2012This paper presents a novel framework for modeling the uplink intercell interference (ICI) in a multiuser cellular network. The proposed framework assists in quantifying the impact of various fading channel models and state-of-the-art scheduling schemes ... More

On the Sum of Squared η-μRandom Variates With Application to the Performance of Wireless Communication SystemsSep 29 2012The probability density function (PDF) and cumulative distribution function of the sum of L independent but not necessarily identically distributed squared \eta-\mu variates, applicable to the output statistics of maximal ratio combining (MRC) receiver ... More

New Results on the Sum of Gamma Random Variates With Application to the Performance of Wireless Communication Systems over Nakagami-m Fading ChannelsFeb 12 2012Jul 18 2012The probability density function (PDF) and cumulative distribution function of the sum of L independent but not necessarily identically distributed Gamma variates, applicable to the output statistics of maximal ratio combining (MRC) receiver operating ... More

An Accurate Sample Rejection Estimator for the Estimation of Outage Probability of EGC ReceiversMar 13 2019In this work, we evaluate the outage probability (OP) for L-branch equal gain combining (EGC) diversity receivers operating over fading channels, i.e. equivalently the cumulative distribution function (CDF) of the sum of the L channel envelopes. In general, ... More

Ergodic Capacity Under Power Adaption Over Fisher-Snedecor F Fading ChannelsFeb 07 2019In this letter, we consider a communication scenario, where the transmitter adopts different power adaption methods according to the instantaneous channel state to enhance the ergodic capacity (EC) over Fisher-Snedecor F fading channels. We derive closed-form ... More

Asymptotic Performance Analysis of Generalized User Selection for Interference-Limited Multiuser SecondaryJan 28 2019We analyze the asymptotic performance of a generalized multiuser diversity scheme for an interference-limited secondary multiuser network of underlay cognitive radio systems. Assuming a large number of secondary users and that the noise at each secondary ... More

Interference Statistics and Capacity Analysis for Uplink Transmission in Two-Tier Small Cell Networks: A Geometric Probability ApproachJan 22 2014Jan 30 2014Small cell networks are evolving as an economically viable solution to ameliorate the capacity and coverage of state-of-the-art wireless cellular systems. Nonetheless, the dense and unplanned deployment of the small cells (e.g., femtocells, picocells) ... More

Interference Management with Partial Uplink/Downlink Spectrum OverlapNov 19 2015Simultaneous reuse of spectral resources by uplink and downlink, denoted as in-band full duplex (FD) communication, is promoted to double the spectral efficiency when compared to its half-duplex (HD) counterpart. Interference management, however, remains ... More

Distributed Cloud Association in Downlink Multicloud Radio Access NetworksMar 01 2015This paper considers a multicloud radio access network (M-CRAN), wherein each cloud serves a cluster of base-stations (BS's) which are connected to the clouds through high capacity digital links. The network comprises several remote users, where each ... More

Tractable Stochastic Geometry Model for IoT Access in LTE NetworksJul 12 2016The Internet of Things (IoT) is large-scale by nature. This is not only manifested by the large number of connected devices, but also by the high volumes of traffic that must be accommodated. Cellular networks are indeed a natural candidate for the data ... More

Spatiotemporal Stochastic Modeling of IoT Enabled Cellular Networks: Scalability and Stability AnalysisSep 17 2016Oct 29 2016The Internet of Things (IoT) is large-scale by nature, which is manifested by the massive number of connected devices as well as their vast spatial existence. Cellular networks, which provide ubiquitous, reliable, and efficient wireless access, are natural ... More

Impact of Pointing Errors on the Performance of Mixed RF/FSO Dual-Hop Transmission SystemsFeb 18 2013In this work, the performance analysis of a dual-hop relay transmission system composed of asymmetric radio-frequency (RF)/free-space optical (FSO) links with pointing errors is presented. More specifically, we build on the system model presented in [1] ... More

On the Performance of Transmit Antenna Selection Based on Shadowing Side InformationSep 18 2012Sep 19 2012In this paper, a transmit antenna selection scheme, which is based on shadowing side information, is investigated. In this scheme, the selected single transmit antenna provides the highest shadowing coefficient between transmitter and receiver. By the ... More

Performance Analysis of Free-Space Optical Links Over Málaga ($\mathcal{M}$) Turbulence Channels with Pointing ErrorsMay 15 2018In this work, we present a unified performance analysis of a free-space optical (FSO) link that accounts for pointing errors and both types of detection techniques (i.e. intensity modulation/direct detection (IM/DD) as well as heterodyne detection). More ... More

Design and Provision of Traffic Grooming for Optical Wireless Data Center NetworksDec 03 2018Traditional wired data center networks (DCNs) suffer from cabling complexity, lack flexibility, and are limited by the speed of digital switches. In this paper, we alternatively develop a top-down traffic grooming (TG) approach to the design and provisioning ... More

Meta Distribution of Downlink Non-Orthogonal Multiple Access (NOMA) in Poisson NetworksNov 06 2018We study the meta distribution (MD) of the coverage probability (CP) in downlink non-orthogonal-multiple-access (NOMA) networks. Two schemes are assessed based on the location of the NOMA users: 1) anywhere in the network, 2) cell-center users only. The ... More