Browsing by Author "Ghrayeb A."
Now showing items 1-20 of 26
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Adaptive network coding for spectrum sharing systems
( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)In this paper, we propose an adaptive network coding scheme for cognitive relay networks comprising multiple secondary sources communicating with a common destination in the presence of multiple primary users. Conventional ... -
Bidirectional Optical Spatial Modulation for Mobile Users: Toward a Practical Design for LiFi Systems
( Institute of Electrical and Electronics Engineers Inc. , 2019 , Article)Among the challenges of realizing the full potential of light-fidelity (LiFi) cellular networks are user mobility, random device orientation, and blockage. In this paper, we study the impact of those challenges on the ... -
Controlling Error Propagation in Network-Coded Cooperative Wireless Systems
( IEEE , 2009 , Article)In cooperative communications, error propagation at relays degrades the diversity order of the system. To combat that effect, it has been suggested to implement a reliability threshold at the relay to control error ... -
Discrete Input Signaling for Secure MISO VLC Systems with Randomly Located Eavesdroppers
( Institute of Electrical and Electronics Engineers Inc. , 2018 , Conference Paper)We study in this paper the secrecy performance of the multiple-input single-output (MISO) visible light communication (VLC) channel in the presence of randomly located eavesdroppers. We consider a system model comprising ... -
Distributed turbo coding using log-likelihood thresholding for cooperative communications
( IEEE , 2009 , Article)In cooperative communications, error propagation at relays reduces the diversity order of the system. To combat that effect, we present a novel technique to control error propagation at the relays, which is presented in ... -
Iterative compressive estimation and decoding for network-channel-coded two-way relay sparse ISI channels
( IEEE , 2012 , Article)We propose an iterative compressive channel estimation and decoding scheme for network-channel-coded two-way relay sparse intersymbol interference channels. The underlying system model comprises two source nodes and one ... -
Joint optimal threshold-based relaying and ML detection in cooperative networks
( IEEE , 2012 , Article)This paper proposes two detection schemes for cooperative networks comprising a source, a relay and a destination. The relay is assumed to operate in a half-duplex mode and it employs decode-and-forward (DF) relaying. The ... -
Joint optimal threshold-based relaying and ml detection in network-coded two-way relay channels
( Institute of Electrical and Electronics Engineers Inc. , 2012 , Article)In this paper, we address the problem of joint optimal threshold-based relaying and maximum likelihood (ML) detection in network-coded cooperative systems. The purpose of using threshold-based relaying is to circumvent the ... -
Mitigating error propagation in two-way relay channels with network coding
( IEEE , 2010 , Article)In relay networks, error propagation at the relay nodes degrades the performance of the system. To combat that effect, it has been suggested to implement a reliability threshold at the relay to control error propagation. ... -
Modeling and analysis of an infrastructure service request queue in multichannel V2I communications
( Institute of Electrical and Electronics Engineers Inc. , 2014 , Article)This paper presents a concise yet comprehensive description of a multichannel vehicle-to-infrastructure communication system. Existing mathematical models for such a system overlook some of its essential behavioral ... -
Modeling and analysis of HetNet interference using Poisson Cluster Processes
( Institute of Electrical and Electronics Engineers Inc. , 2014 , Conference Paper)Future mobile networks are converging towards being heterogeneous, owing to the co-existence of multi-tier networks within the same geographical area, including macro, pico- and femto-cells. The deployment of such networks ... -
Modeling Heterogeneous Cellular Networks Interference Using Poisson Cluster Processes
( Institute of Electrical and Electronics Engineers Inc. , 2015 , Article)Future mobile networks are converging toward heterogeneous multitier networks, where macro-, pico-, and femto-cells are randomly deployed based on user demand. A popular approach for analyzing heterogeneous networks (HetNets) ... -
Modelling, analysis and performance improvement of an SRU's access request queue in multi-channel V2I communications
( Elsevier B.V. , 2015 , Conference Paper)This paper presents a concise yet comprehensive description of a multi-channel Vehicle-to-Infrastructure (V2I) communication system. Existing mathematical models for such a system overlook some of its essential behavioural ... -
Multi-resampling Doppler compensation in cooperative underwater OFDM systems
( IEEE , 2013 , Conference Paper)We consider a multi-carrier cooperative underwater acoustic communication (UWAC) system and investigate the Doppler scaling problem arising due to the motion of different nodes. Specifically, we assume an orthogonal frequency ... -
On hierarchical network coding versus opportunistic user selection for two-way relay channels with asymmetric data rates
( IEEE , 2013 , Article)We address in this paper the challenge of coping with asymmetric data rates in two-way relay channels. We consider a relay network comprising two sources and one relay. The sources communicate at different rates through ... -
On relay assignment in network-coded cooperative systems
( IEEE , 2011 , Article)We consider in this paper relay assignment for cooperative systems with multiple two-way relay channels. The nodes corresponding to one two-way relay channel (henceforth referred to as pair) communicate with each other ... -
On the Achievable Secrecy Diversity of Cooperative Networks with Untrusted Relays
( Institute of Electrical and Electronics Engineers Inc. , 2018 , Article)Cooperative relaying is often deployed to enhance the communication reliability (i.e., diversity order) and consequently the end-to-end achievable rate. However, this raises several security concerns when the relays are ... -
Performance analysis of relay assignment schemes for cooperative networks with multiple source-destination pairs
( IEEE , 2012 , Article)In this paper, we consider two relay assignment schemes for cooperative networks comprising multiple source-destination pairs. Both schemes are based on the max-min criterion and aim at achieving the maximum spatial diversity ... -
Precoding-Aided Spatial Modulation for the Wiretap Channel with Relay Selection and Cooperative Jamming
( Hindawi Limited , 2018 , Article)We propose in this paper a physical-layer security (PLS) scheme for dual-hop cooperative networks in an effort to enhance the communications secrecy. The underlying model comprises a transmitting node (Alice), a legitimate ... -
Priority-based zero-forcing in spectrum sharing cognitive systems
( IEEE , 2013 , Article)We consider a spectrum sharing scenario between cognitive radio (CR) users and a licensed primary user (PU), in which the PU is not able to successfully transmit data to its destined receiver. The cognitive base station ...