Salama S. Ikki

Lakehead University Thunder Bay Campus, Thunder Bay, Ontario, Canada

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Publications (45)37.41 Total impact

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    ABSTRACT: Cognitive radio allows secondary users to use the same existing frequency spectrum band as primary users. This co-existence has several impacts on the whole network. This has motivated us to study the performance of a more practical dualhop underlay cognitive network, by considering the interference power constraint, the primary transceiver and the co-channel interference (CCI).We start by determining the equivalent signalto- interference-plus-noise ratio (SINR) of the secondary network, then, we derive the cumulative distribution function (CDF) of the equivalent SINR. Using the derived CDF, system outage probability has been assessed. Furthermore, an approximate expression for the system average error probability has been derived. From the results it can be observed that besides the impact of the interference power constraint, the presence of the primary transmitter and the CCI will severely reduce the system performance especially when the CCI linearly increases with the secondary transmit power. Finally, numerical results and Monte Carlo simulations are also provided to sustain the correctness of the analytical derivations.
    No preview · Article · Jul 2015
  • R. Mesleh · S.S. Ikki
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    ABSTRACT: Quadrature spatial modulation (QSM) is a new multiple-input multiple-output (MIMO) transmission technique that enhances the overall spectral efficiency of conventional spatial modulation (SM). QSM extends the single dimension spatial constellation to another dimension by considering the inphase and the quadrature components of the data symbol. It has been shown that spectral efficiency can be significantly increased while most inherent advantages of SM are retained. In this paper, the impact of Gaussian imperfect channel estimation on the performance of QSM system is studied. A closed-form expression for the pair-wise 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. Also, simple asymptotic expression is derived and analyzed. Obtained Monte Carlo simulation results highlight the accuracy of the conducted analysis.
    No preview · Article · Jun 2015
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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.
    No preview · Article · May 2015 · IEEE Communications Letters

  • No preview · Article · Jan 2015 · IEEE Transactions on Vehicular Technology

  • No preview · Article · Jan 2015 · IEEE Transactions on Communications
  • O.S. Badarneh · R. Mesleh · S.S. Ikki · H.M. Aggoune
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    ABSTRACT: This paper analyzes the performance of space modulation techniques over generalized fading channels with imperfect channel estimation. In particular, a unified approach for calculating the pairwise error probability (PEP) of spatial modulation (SM) and space shift keying (SSK) modulation techniques for multiple-input multiple-output (MIMO) wireless communication systems is presented. A new, simple, and exact closed-form expression for the PEP over generalized \alpha-\mu fading channels under imperfect channel state information (CSI) is derived. The PEP expression considers the joint distributions of the envelope and the phase of the fading channel. Furthermore, the derived PEP and the union bound technique are used to obtain a closed-form expression for the average bit error rate (BER). The influence of the fading parameters \alpha and \mu and the channel estimation error on the system performance is analyzed and discussed through representative numerical examples. The correctness of our derivations is validated by means of Monte-Carlo simulations. andcopy; 2014 IEEE.
    No preview · Article · Nov 2014
  • R. Mesleh · S.S. Ikki · O. Amin
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    ABSTRACT: A high spectral efficiency cooperative communication system is proposed in this paper. The concept of signal space diversity (SSD) is utilized to double the spectral efficiency of opportunistic cooperative communication networks. SSD rotates the transmitted symbols by a certain angle at the source, before transmission, such that each in-phase and quadrature component of the rotated symbol contains enough information to retrieve the entire original data symbol. As such, parts of the rotated symbols are transmitted by the source and the other parts are transmitted by a relay. In opportunistic relaying, the best relay among all relays that decode the source signals correctly participates in forwarding a message to the destination. Optimum receiver along with detailed performance analysis are presented in this paper. Also, asymptotic analysis and optimum power allocations at the source and the active relay are given. It is shown that the proposed technique enhances the performance by about 2dB over the conventional opportunistic relaying. As well, optimum power allocation is shown to further enhance the error probability performance.
    No preview · Article · Nov 2014
  • 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.
    No preview · Article · Nov 2014 · Transactions on Emerging Telecommunications Technologies
  • Source
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    ABSTRACT: A study of the effect of co-channel interference (CCI) on the performance of opportunistic multi-relay amplify-and-forward cooperative communication network is presented. Precisely, we consider the CCI exists at both relays and destination nodes. Exact equivalent end-to-end signal-to-interference-plus-noise ratio (SINR) is derived. Then, closed-form expressions for both cumulative distribution function (CDF) and probability density function (PDF) of the received SINR at the destination node are obtained. The derived expressions are used to measure the asymptotic outage probability of the system. Numerical results and Matlab simulations are also provided to sustain the correctness of the analytical calculations.
    Full-text · Conference Paper · Sep 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.
    No preview · Article · Sep 2014 · IEEE Communications Letters
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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.
    No preview · Article · Sep 2014 · IEEE Communications Letters
  • Raed Mesleh · Salama S. Ikki
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    ABSTRACT: A high spectral efficiency multiple-input multiple- output (MIMO) technique called Quadrature Spatial Modulation (QSM) is proposed in this work. QSM enhances the overall spectral-efficiency of conventional SM systems by using an extra spatial modulation dimension. The conventional SM technique uses only the real part of the spatial modulation constellation and QSM extends this to in-phase and quadrature dimensions. It is shown that significant performance enhancements as compared to conventional SM can be achieved without any extra cost. Also, a closed-form expression for the pair-wise 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. Additionally, simple and general asymptotic expression is derived and analyzed. Obtained Monte Carlo simulation results corroborate the accuracy of the conducted analysis and demonstrate the significant enhancements of the QSM scheme.
    No preview · Conference Paper · Sep 2014
  • Hussein A. Leftah · Said Boussakta · Salama Ikki
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    ABSTRACT: This paper presents a new Alamouti space-timeblock coding (STBC) orthogonal frequency division multiplexing (ST-OFDM) system. The transmitter of the proposed scheme is based on a low complexity X-transform that is developed in [1] as a modulation scheme instead of the inverse fast Fourier transform (IFFT). The proposed ST-X-OFDM scheme massively reduces the transmitter complexity, the effects of multipath channels, and the peak-to-average power ratio (PAPR). The complexity of the proposed scheme is evaluated and compared with the conventional ST-OFDM, showing that the proposed scheme is efficient, fast, and simple in implementation. An exact closed-form bit-error rate (BER) is derived for the proposed scheme over multipath channels and different kinds of modulation formats. Computer simulations corroborated by mathematical results prove that, over frequency-selective multipath channels and different mapping schemes, the proposed approach achieves significant signal-to-noise ratio (SNR) gain in comparison to the ST-OFDM system. The proposed ST-X-OFDM system adopts only a single, low complexity transform at the transmitter without precoding and achieves significant BER improvement over the conventional ST-OFDM system.
    No preview · Conference Paper · Jul 2014
  • Source
    Kaïs Ben 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.
    Full-text · Article · Jun 2014 · IET Communications
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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).
    No preview · Conference Paper · Jun 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.
    No preview · Article · Mar 2014 · IET Communications
  • 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.
    No preview · Article · Mar 2014 · Transactions on Emerging Telecommunications Technologies
  • 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.
    No preview · Article · Jan 2014 · IEEE Transactions on Vehicular Technology
  • Source
    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.
    Full-text · Article · Oct 2013 · IEEE Communications Letters
  • Source
    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.
    Full-text · Article · Sep 2013 · IEEE Transactions on Vehicular Technology

Publication Stats

381 Citations
37.41 Total Impact Points

Institutions

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