Salama S. Ikki

Lakehead University Orillia Campus, Орилија, Ontario, Canada

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Publications (37)34.43 Total impact

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    ABSTRACT: In this paper, we focus on the systematic optimization of power allocation in a selective relaying scheme with imperfect channel estimation in a multi-relay decode-and-forward cooperative network in which the relays have the flexibility to employ a modulation level different than that of the source, whenever there is a merit. First, we obtain an asymptotic expression for the error probability in the presence of Gaussian imperfect channel estimations. Then, by using this expression, we derive the power allocation scheme that minimizes the asymptotic error probability. We show that the power allocation problem can suitably be presented as a geometric programming problem that is solved by an efficient convex programming technique. Finally, the derivations are confirmed through Monte Carlo simulations.
    IEEE Communications Letters 05/2015; 19(5):867-870. DOI:10.1109/LCOMM.2015.2408596 · 1.46 Impact Factor
  • Raed Mesleh, Salama S. Ikki, Hadi M. Aggoune
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    ABSTRACT: In this paper, a new multiple-input multiple-output transmission technique called quadrature spatial modulation (QSM) is proposed and analyzed in the presence of imperfect channel estimation at the receiver. In QSM, conventional spatial constellation diagram of spatial modulation (SM) system is expanded to include both in-phase and quadrature components. As such, significant enhancement in the overall spectral efficiency is achieved while retaining all inherent advantages of SM technique, such as inter-channel interference avoidance, single radio frequency chain transmitter and low receiver complexity. It is shown that significant performance enhancements can be achieved as compared with SM, Alamouti, and spatial multiplexing systems. Besides, the impact of Gaussian imperfect channel estimation on the performance of QSM system is studied. A closed-form expression for the pairwise error probability of generic QSM system is derived and used to calculate a tight upper bound of the average bit error probability over Rayleigh fading channels with perfect and imperfect channel knowledge. Also, simple asymptotic expression is derived and analyzed. Obtained Monte Carlo simulation results highlight the accuracy of the conducted analysis. Copyright © 2014 John Wiley & Sons, Ltd.
    11/2014; DOI:10.1002/ett.2905
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    ABSTRACT: In this letter, the performance of space shift keying (SSK) modulation for multiple-input multiple-output (MIMO) systems with imperfect channel knowledge and in the presence of co-channel interference (CCI) and Rayleigh fading is investigated. In particular, closed-form expressions of the average bit error probability (ABEP) for an arbitrary number of transmit antennas are obtained. To gain further insight on the system performance, simple asymptotic expressions of the ABEP for high Signal-to-Noise Ratio (SNR) are computed, which provide information on the achievable diversity order and coding gain. Numerical results are shown to substantiate mathematical frameworks and findings.
    IEEE Communications Letters 09/2014; 18(9):1587-1590. DOI:10.1109/LCOMM.2014.2347289 · 1.46 Impact Factor
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    EUSIPCO2014; 09/2014
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    ABSTRACT: This letter investigates the error performance for the space shift keying (SSK) system under spectrum sharing environments. The secondary network under consideration is equipped with multiple antennas at the transmitter and receiver. The primary network is composed of $L$ primary users (PUs) equipped with multiple antennas. For the underlay spectrum sharing transmission with SSK modulation, the transmit power condition of our proposed spectrum-sharing system is governed by the interference temperature limit on the primary network and the maximum transmission power at the secondary network. In particular, expressions for exact and asymptotic error probability are derived. Simulation results and intuitive discussions are provided to show the correctness of our derived analytical results.
    IEEE Communications Letters 09/2014; 18(9):1503-1506. DOI:10.1109/LCOMM.2014.2340877 · 1.46 Impact Factor
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    K.B. Fredj, Salama S. Ikki, Sonia Aïssa
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    ABSTRACT: This paper studies the performance of a two-way relay-based communication system with opportunistic relay selection in Nakagami-m fading environments. The authors consider a two-way wireless communication system where two nodes, acting as sources and using different modulation schemes for transmission, are unable to exchange data because of deep fading on their direct link and proceed via L relay terminals. They provide closed-form expression for the probability density function of the link between the 'selected' best relay and each source, and use this result to derive a closed-form expression for the average symbol error probability which, to the best knowledge of the authors, has never been done before. This result is further approximated for the high signal-to-noise ratio regions and used to develop closed-form expressions for the optimised power allocated to each node involved in the communication process. The authors asset their formulae with numerical results and interpretations to complete this work.
    IET Communications 06/2014; 8(9):1626-1636. DOI:10.1049/iet-com.2013.0596 · 0.74 Impact Factor
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    ABSTRACT: Despite the rich literature on cooperative networks, employment of different modulation levels by the source and relay terminals has not been investigated thoroughly from the physical layer perspective. In this paper, we investigate the bit error rate (BER) performance of selective relaying in a multi-relay decode-and-forward cooperative network where the source and the relays transmit using different modulation levels. Specifically, we derive a closed form expression for the end-to-end (uncoded) BER. To draw further insights on the BER performance, we also provide a simpler approximate BER expression that is accurate in the high signal-to-noise ratio regime. Finally, simulation results are presented to verify the analytical results. The derived BER expressions can be utilized in various other scenarios in which the destination selects the best signal (in terms of minimizing BER) among a set of signals which use different modulation levels. The set of signals to choose from may have already been received through orthogonal channels (selection combining), or this signal set may correspond to a set of “candidate” transmissions. The latter scenario is often referred to as selective transmission; applications of this scenario include selective relaying (the setting in this paper), fast base-station selection, and coordinated multipoint transmission and reception (CoMP).
    ICC 2014 - 2014 IEEE International Conference on Communications; 06/2014
  • Raed Mesleh, Salama S. Ikki, Osama Amin
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    ABSTRACT: Performance analysis of multi-hop wireless networks with non-regenerative relays over Nakagami-m fading channels in the presence of co-channel interference is presented in this paper. In the analysis, an arbitrary number of independent and identically distributed Nakagami-m interferers will be considered. Closed-form expression for the cumulative distribution function (CDF) of the upper bounded end-to-end signal-to-interference-plus-noise ratio (SINR) at the destination is given. The obtained CDF is then considered to study the average bit error probability (ABEP). Furthermore, an approximate expression for the CDF of the instantaneous end-to-end SINR is derived, based on which simple and general asymptotic expression for the error probability is presented and discussed. The derived asymptotic equation is shown to reduce to the already published equation in Rayleigh fading, which corroborate the exactness of the derived analysis. Besides, analytical comparison between amplify-and-forward and decode-and-forward multi-hop systems in terms of ABEP is provided. Optimisation of the power allocation at the network's transmit nodes and the positioning of the relays are studied as well. It is shown that optimum power allocation achieves only coding gain, whereas optimising relay locations yields diversity gains as well as coding gain.
    IET Communications 03/2014; 8(4):483-491. DOI:10.1049/iet-com.2013.0659 · 0.74 Impact Factor
  • Salama S. Ikki
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    ABSTRACT: We consider power allocation (PA) and relay positioning in a dual-hop amplify-and-forward relaying system over Nakagami-m fading channels. We investigate adaptive PA with fixed relay location, optimal relay location with fixed PA, and joint optimisation of the PA and relay location under transmit power constraint in order to minimise average error probability and outage probability. Analytical results are validated by numerical simulations and comparisons between the different optimisation schemes and their performance are provided. Results show that optimum PA brings only coding gain, whereas optimum relay location yields, in addition to the latter, diversity gains as well. Also, joint optimisation improves both, the diversity gain and coding gain. Furthermore, results illustrate that the analysed adaptive algorithms outperform uniform schemes. Copyright © 2012 John Wiley & Sons, Ltd.
    03/2014; 25(3). DOI:10.1002/ett.2571
  • Raed Mesleh, Salama S. Ikki, Hadi M. Aggoune
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    ABSTRACT: This paper proposes a new multiple-input–multiple-output (MIMO) technique called quadrature spatial modulation (QSM). QSM enhances the overall throughput of conventional SM systems by using an extra modulation spatial dimension. The current SM technique uses only the real part of the SM constellation, and the proposed method in this paper extends this to in-phase and quadrature dimensions. It is shown that significant performance enhancements can be achieved at the expense of synchronizing the transmit antennas. Additionally, a closed-form expression for the pairwise error probability (PEP) of generic QSM system is derived and used to calculate a tight upper bound of the average bit error probability (ABEP) over Rayleigh fading channels. Moreover, a simple and general asymptotic expression is derived and analyzed. Obtained Monte Carlo simulation results corroborate the accuracy of the conducted analysis and show the significant enhancements of the proposed QSM scheme.
    IEEE Transactions on Vehicular Technology 01/2014; 64(6):1-1. DOI:10.1109/TVT.2014.2344036 · 2.64 Impact Factor
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    Yanju Gu, Salama S. Ikki, Sonia Aissa
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    ABSTRACT: This paper investigates the impacts of co-channel interference and outdated channel state information (CSI), two main issues in practical operating environment, on the performance of opportunistic decode-and-forward cooperative networks. First, the distribution function of the effective signal-to-interference-plus-noise ratio at the end receiver is derived. Then, exact closed-form expressions for the error and outage probabilities are obtained. Furthermore, simple asymptotic expressions for the error probability, which explicitly show the coding and the diversity gains, are derived and discussed. In particular, it is demonstrated that the diversity order of the system is reduced to unity when CSI is outdated, and to zero when the ratio of the interference energy to the signal energy is constant.
    IEEE Communications Letters 10/2013; 17(10):1948-1951. DOI:10.1109/LCOMM.2013.090213.131493 · 1.46 Impact Factor
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    A.H. Forghani, Salama S. Ikki, Sonia Aissa
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    ABSTRACT: In this paper, we study the performance of opportunistic amplify-and-forward (AF) multihop multibranch relaying networks operating in the presence of cochannel interference (CCI). We obtain exact and upper bound expressions for the end-to-end signal-to-interference-plus-noise ratio (SINR), assuming transmissions over independent nonidentical Rayleigh fading channels. Afterward, the cumulative distribution function (cdf) and the probability density function (pdf) of the upper bound end-to-end SINR are investigated. According to these statistics, we obtain a lower bound closed-form expression for the outage probability. Furthermore, an approximate expression for the pdf of the end-to-end SINR is derived. Subsequently, simple expressions for the approximate error and outage probabilities are provided. These expressions deliver more understanding on the effect of the system parameters. Moreover, we address the optimization of the power allocation among the transmit nodes to enhance the overall system performance. As an optimal solution for the resource-allocation problem at hand, the adaptive power allocation minimizes the error probability under constraint on the aggregate power over the branch with the maximum SINR. It is shown that by applying the energy obtained through the optimization process, the performance of the network is improved significantly. Eventually, the accuracy of the analysis is validated by comparing the numerical results with Monte Carlo simulations, and insightful discussions are provided.
    IEEE Transactions on Vehicular Technology 09/2013; 62(7):3437-3443. DOI:10.1109/TVT.2013.2256806 · 2.64 Impact Factor
  • Raed Mesleh, Salama S. Ikki
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    ABSTRACT: Spatial modulation (SM) is a multiple-input multiple-output (MIMO) transmission scheme that draws momentous attention lately due to its reported performance enhancements over other MIMO techniques. However, a major drawback of SM system is that the achieved diversity gain is limited to the number of receive antennas and poor performance is reported for small number of receive antennas. Therefore, it is the aim of this paper to study the performance of SM with multiple decode and forward (DF) relays in which the relays that correctly detect the source signal forward the decoded message to the destination in pre-determined orthogonal channels. A closed form expression of the pair wise error probability (PEP) is obtained for a system consisting of two transmit antennas, multiple DF relays and single receive antenna. As well, asymptotic expression for the PEP at high signal to noise ratio (SNR) is derived. It is shown that significant performance enhancements can be achieved and the derived analysis is validated through Monte Carlo simulation results.
    IEEE Wireless Communication Letters 08/2013; 2(4):423-426. DOI:10.1109/WCL.2013.051513.130256
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    Salama S. Ikki, P. Ubaidulla, Sonia Aissa
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    ABSTRACT: A study of the effects of co-channel interference on a multirelay system with decode-and-forward (DF) protocol is presented. Orthogonal relaying is considered, and all relays that correctly decode the message in the broadcasting phase participate in the adaptive relaying phase. First, the effective signal-to-interference-plus-noise ratio (SINR) at the receiver is derived. Then, considering outage as the performance metric, we obtain exact closed-form expression for the outage probability. Simple and general asymptotic expressions for the outage probability, which explicitly show the coding and the diversity gains, are also derived and discussed. Furthermore, we present optimal energy-allocation schemes for minimizing outage under different resource constraints. Monte Carlo simulations are further provided to confirm the analytical results and illustrate the outage performance for different interference conditions and optimization schemes.
    IEEE Transactions on Vehicular Technology 02/2013; 62(2):896-902. DOI:10.1109/TVT.2012.2224679 · 2.64 Impact Factor
  • Raed Mesleh, Salama S. Ikki
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    ABSTRACT: Space shift keying (SSK) is a multiple-input, multiple-output system where the indices of the transmit antennas form the constellation symbols and no other data symbol is transmitted. In this paper, amplify-and-forward (AF) multiple-input, multiple-output relaying techniques with an SSK system are proposed and analysed. Single and multiple relays are located between the source and the destination and used to forward the transmitted messages from the source to the destination. Conventional AF relaying in which all relays amplify their received signal and forward it to the destination at specific time slot and opportunistic AF relaying where only the best relay is activated and all other relays are kept silent are considered. The receiver, with a single receive antenna, applies optimum detector to retrieve the transmitted information bits. Closed-form bit error ratio expressions are provided for a source equipped with two transmit antennas. Additionally, a good approximate upper bound is derived for higher number of transmit antennas. The analytical results are validated through Monte Carlo simulation results. It is revealed that multiple relays can be considered to significantly enhance the performance of SSK system, and the diversity gain equals the number of existing relays. Copyright © 2013 John Wiley & Sons, Ltd.
    01/2013; 26(4). DOI:10.1002/ett.2611
  • Raed Mesleh, Salama Said Ikki, Osama Amin, Said Boussakta
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    ABSTRACT: In this paper, performance and optimization study of multi-hop wireless system with amplify and forward (AF) relays over Nakagami-m fading channels and in the presence of co-channel interference is considered. Arbitrary number of independent and identically distributed Nakagami-m interferers is assumed in the analysis. The cumulative distribution function (CDF) of the upper bounded end-to-end signal-to-interference-plus-noise ratio (SINR) at the destination is calculated in closed-form. The obtained CDF is then used to study the end-to-end average bit error probability (ABEP). As well, approximate expression for the CDF of the instantaneous end-to-end SINR is derived. Based on this, simple and general asymptotic expression for the error probability is presented and discussed. Finally, optimizing power allocation at the transmit nodes and the positioning of the relays are studied. Obtained results revealed that optimum power allocation slightly enhances the performance, whereas optimizing relay locations yields significant performance enhancement. Further improvement is shown to be achieved through joint power and positions optimization.
    Personal Indoor and Mobile Radio Communications (PIMRC), 2013 IEEE 24th International Symposium on; 01/2013
  • Raed Mesleh, Salama S. Ikki
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    ABSTRACT: In this paper, spatial modulation (SM) is considered in a cooperative communication system and the effect of imperfect channel estimation on the overall system performance is analyzed. SM is a multiple-input multiple-output (MIMO) technique that considers the multiple transmit antennas as an added constellation points and utilizes them to boost the spectral efficiency. In our analysis, a wireless communication system, where a source communicating with a destination through a direct link and multiple decode and forward (DF) relays, is considered. Imperfect channel knowledge is assumed at each relay and at the destination node. In cooperative mode, only the relays that correctly decode the source signal forward the decoded message to the destination. A closed form expression of the pair wise error probability (PEP) is obtained for a system consisting of two transmit antennas, multiple DF relays and single receive antenna and a tight upper bound is given for the average error probability. As well, asymptotic expression for the PEP at high signal to noise ratio (SNR) is derived.
    Personal Indoor and Mobile Radio Communications (PIMRC), 2013 IEEE 24th International Symposium on; 01/2013
  • S.S. Ikki, R. Mesleh, S. Boussakta
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    ABSTRACT: Amplify-and-forward (AF) relaying with multi-branch dual-hop relays in independent non-identical generalized Gamma fading channels with multiple antennas at the destination is addressed. We consider orthogonal relaying and study conventional cooperative systems where all relays participate in the relaying phase as well as opportunistic cooperative systems where only the best relay participates in the relaying phase. An expression for the approximate probability density function (PDF) of the total instantaneous signal-to-noise ratio (SNR) at the destination is derived. Subsequently, expression for the asymptotic average error rate is presented. The results provided are fairly simple and general for arbitrary values of the fading severity parameters. It is shown that opportunistic relaying does not necessarily outperform the conventional approach in terms of coding gain under equal energy allocation as in the Rayleigh fading case. Simulation results verify the tightness of the proposed analytical expressions in the high SNR region.
    Signal Processing Advances in Wireless Communications (SPAWC), 2013 IEEE 14th Workshop on; 01/2013
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    S.S. Ikki, S. Aïssa
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    ABSTRACT: In this study, the authors investigate the effect of co-channel interference on the performance of dual-hop communications with amplify-and-forward relaying. First, the exact equivalent signal-to-interference-plus-noise ratio (SINR) at the destination is formulated and upper bounded. Then, the cumulative distribution function, probability density function (PDF) and moment generating function of the upper bounded SINR are determined. Further, expressions for the error and the outage probabilities are obtained. Moreover, an approximate PDF of the dual-hop link's instantaneous SINR is derived. In particular, simple expressions for the error and outage probabilities are presented and discussed. Numerical and simulation results are provided and confirm the tightness of the presented asymptotic expressions. Besides, optimisation of the power allocation and relay positioning are addressed. Specifically, the authors study adaptive power allocation with fixed relay location, optimal relay location with fixed power allocation, and joint optimisation of the power allocation and relay location under total transmit power constraint, in order to minimise the asymptotic average error probability and outage probability. Results show that optimum power allocation, optimum relay location and joint optimisation significantly improve the system performance in terms of error and outage probabilities compared to uniform power allocation and mid-point distance location of the relay node.
    IET Communications 11/2012; 6(17). DOI:10.1049/iet-com.2011.0891 · 0.74 Impact Factor
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    Salama S. Ikki, Sonia Aissa
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    ABSTRACT: In this work, we analyze the performance of decode-and-forward cooperative diversity networks with imperfect channel estimation and co-channel interference. Orthogonal relaying is considered and all relays that correctly decode the source message in the broadcasting phase participate in the relaying phase. First, the output signal-to-interference-plus-noise ratio (SINR) at the destination is derived. Then, considering error and outage as the performance metrics, we obtain exact closed-form expressions for the error and outage probabilities. Simple and general asymptotic expression for the error probability, which explicitly shows the coding and the diversity gains, is also derived and discussed.
    IEEE Wireless Communication Letters 10/2012; 1(5):436-439. DOI:10.1109/WCL.2012.062512.120003

Publication Stats

247 Citations
34.43 Total Impact Points

Institutions

  • 2014
    • Lakehead University Orillia Campus
      Орилија, Ontario, Canada
    • Lakehead University Thunder Bay Campus
      • Department of Electrical Engineering
      Thunder Bay, Ontario, Canada
  • 2012–2014
    • Institut national de la recherche scientifique
      Québec, Quebec, Canada
    • INRS
      Lutetia Parisorum, Île-de-France, France
    • University of Tabuk
      Gabouk, Minţaqat Tabūk, Saudi Arabia
  • 2012–2013
    • Newcastle University
      • School of Electrical and Electronic Engineering
      Newcastle-on-Tyne, England, United Kingdom
    • Université du Québec à Montréal
      Montréal, Quebec, Canada
  • 2010–2011
    • University of Waterloo
      • Department of Electrical & Computer Engineering
      Waterloo, Ontario, Canada