Publications

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2014
Ayadi, E. M. M. H., and M. H. Ismail, "Novel Tight Closed-form Bounds for the Symbol Error Rate of EGC and MRC Diversity Receivers Employing Linear Modulations over alpha − mu Fading", Wireless Personal Communications, vol. 77, issue 1, pp. 571-587, 2014.
Alhennawi, H. R., M. H. Ismail, and H. - A. M. Mourad, "Performance evaluation of energy detection over extended generalized-K (EGK) composite fading channels", Electronics Letters, vol. 50, issue 22, pp. 1643-1645, 2014.
2013
ElAyadi, M. M. H., and M. H. Ismail, "Novel Simple Bounds on the Probability of Error for EGC and MRC Diversity Receivers over α−μ Fading", Proc. of the 20th International Conference on Telecommunications (ICT 2013), Casablanca, Morocco, May, 2013.
Fahim, M., M. H. Ismail, and H. Tawfik, "Multi-stage Energy Detection Spectrum Sensing Using Group Intelligence", Proc. of the 18th IEEE Symposium on Computers and Communications (ISCC 2013), Split, Croatia, July, 2013.
Mohamed, R., M. H. Ismail, F. A. Newagy, and H. - A. M. Mourad, "Probability of Error and Ergodic Capacity of Switch-and-Examine Combining Diversity over the α−μ Fading Channel", Proc. of the 18th IEEE Symposium on Computers and Communications (ISCC 2013), Split, Croatia, July, 2013.
Mohamed, R., M. H. Ismail, F. Newagy, and H. - A. M. Mourad, "Closed-form Capacity Expressions for the α−μ Fading Channel with SC Diversity under Different Adaptive Transmission Strategies", Frequenz, vol. 2013, issue 3-4, pp. 127–137, 2013. Abstract

Stemming from the fact that the α-μ fading distribution is one of the very general fading models used in the literature to describe the small scale fading phenomenon, in this paper, closed-form expressions for the Shannon capacity of the α-μ fading channel operating under four main adaptive transmission strategies are derived assuming integer values for μ. These expressions are derived for the case of no diversity as well as for selection combining diversity with independent and identically distributed branches. The obtained expressions reduce to those previously derived in the literature for the Weibull as well as the Rayleigh fading cases, which are both special cases of the α-μ channel. Numerical results are presented for the capacity under the four adaptive transmission strategies and the effect of the fading parameter as well as the number of diversity branches is studied.

Ismail, M. H., and R. Mohamed, "Outage Probability Analysis of Selection and Switch-and-Stay Combining Diversity Receivers Over the α−μ Fading Channel with Co-Channel Interference", Wireless Personal Communications, vol. 71, issue 3: Springer US, pp. 2181-2195, 2013. Website
Gaber, A. H., M. H. Ismail, and H. - A. M. Mourad, "Outage Probability Analysis of Cooperative Diversity Networks Over Weibull and Weibull-Lognormal Channels", Wireless Personal Communications, vol. 70, no. 2: Springer US, pp. 695-708, 2013. AbstractWebsite
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2012
Elgendy, O. A., M. H. Ismail, and K. Elsayed, "On the Relay Placement Problem in a Multi-cell LTE-Advanced System with Co-channel Interference", Proc. of the 8th IEEE Int.Conf on Wireless and Mobile Computing, Networking and Communications (WiMob 2012), Barcelona, Spain, October, 2012. Abstract

One of the main problems in LTE-A networks is the small rates achieved by cell-edge users. This is due to the adoption of a frequency reuse factor of 1, which aims at increasing the overall capacity. This occurs, however, at the expense of increasing the interference level for cell-edge users. Cooperative communication through the use of relays is an efficient technique to solve this problem. However, careful placement of the relays is a crucial factor in determining the expected capacity gain. In this paper, the relay placement problem in an LTE-A network is studied, taking into consideration the effect of co-channel interference. An optimization framework is proposed to maximize either the total cell capacity or the total cell-edge capacity. Simulation results show a capacity gain factor of 8.027 for cell-edge users due to relay deployment, under 100% cell load in center cell and adjacent cells.

Mohamed, R., M. H. Ismail, and H. - A. M. Mourad, "Performance of Dual Selection and Switch-and-Stay Combining Diversity Receivers over the alpha-mu Fading Channel with Co-channel interference", Proc. of the Int. Symposium on Signals, Systems and Electronics (ISSSE 2012), Potsdam, Germany, October, 2012.
Abdelaal, R., K. Elsayed, and M. H. Ismail, "Cooperative Scheduling, Precoding, and Optimized Power Allocation for LTE-Advanced CoMP Systems", Wireless Days, Dublin, Ireland, November, 2012.
Elkotby, H., K. Elsayed, and M. H. Ismail, "Shrinking the Reuse Distance: Spectrally-Efficient Radio Resource Management in D2D-Enabled Cellular Networks with Interference Alignment", Wireless Days, Dublin, Ireland, November, 2012. Abstract

Enabling underlay direct Device-to-Device (D2D) communication mode in future cellular networks has good potential for spectrally-efficient and low-latency support of local media services. Recently, it has become evident that shrinking the reuse distance over which wireless resources are reused is a key enabler for achieving high spectral efficiency. Moreover, Interference Alignment (IA) based transmission can enhance the capacity of a wireless network by providing more degrees of freedom. In this work, we exploit clustering of D2D users, frequency reuse over clusters and then using IA to enhance the sum rate. Specifically, we show that in a D2D environment, it is possible to achieve significant gains in attainable rates by constructing clusters of D2D pairs and reuse the available radio resources over the clusters. Moreover, within a cluster, it is possible to further enhance the spectral efficiency by constructing small-sized groups of D2D pairs over which IA is applied to offer additional degrees of freedom. We show that resource reuse over the clusters offer overall rate increase proportional to the number of formed clusters. In addition, interference alignment offers up to 33% increase in the overall rates in the high transmission power regimes compared to the normal Point-to-Point (P2P) communication.

Said, L. A., A. H. Madian, M. H. Ismail, and A. M. Soliman, "Digitally Programmable Lossless Floating Inductor Realization using Current Differential Amplifier (CDA)", Proc. of the 16th IEEE Mediterranean Electrotechnical Conference (MELECON 2012), Medina Yasmine Hammamet, Tunisia, March, 2012. Abstract

A digitally programmable lossless floating inductor realization circuit is proposed. The proposed block uses current differential amplifier as an active block and the programmability is achieved through array of capacitors each one is connected to a switch, according to the logic 1 or 0 applied to the switch gate; the array size change and the programmability is achieved. The presented circuit realizes a tunable floating inductor tuned from L=26.624μH to 38.088mH. To show the reliability of the proposed block, Programmable resonant circuit has been implemented using the proposed circuit from frequency 51 kHz to 86 kHz. Also, Programmable low pass filter have been realized using the digital programmable block from frequency 6MHz to 17MHz. The simulation results has been demonstrated and discussed using PSPICE simulation for 0.18 μ m CMOS technology provided by TSMC. The proposed circuit uses ±1.5 V dual supply voltages.

Mohamed, R., M. H. Ismail, F. A. Newagy, and H. - A. M. Mourad, "Capacity of the alpha-mu Fading Channel with SC Diversity under Adaptive Transmission Techniques", Proc. of the19th International Conference on Telecommunications (ICT 2012), Jounieh, Lebanon, April, 2012.
Elkotby, H., K. Elsayed, and M. H. Ismail, "Exploiting Interference Alignment for Sum Rate Enhancement in D2D-Enabled Cellular Networks", Proc. of the IEEE Wireless Communications and Networking Conference (WCNC 2012), Paris, France, April, 2012.
Gaber, A. H., M. H. Ismail, H. - A. M. Mourad, and H. A. Mansour, "Probability of Error of TDMA Relay Protocols over Weibull and Weibull-Lognormal Channels", Proc. of the 29th National Radio Science Conference (NRSC 2012), Cairo, Egypt, April, 2012.
Abdelaal, R., M. H. Ismail, and K. Elsayed, "Resource Allocation Strategies Based on the Signal-to-Leakage-plus-Noise Ratio in LTE-A CoMP Systems", Proc. of the IEEE Wireless Communications and Networking Conference (WCNC 2012), Paris, France, April, 2012.
Ayadi, E. M. M. H., and M. H. Ismail, "On the cumulative distribution function of the sum and harmonic mean of two α−μ random variables with applications", IET Communications, vol. 6, issue 18, 2012.
Abdelmonem, M. A., M. Nafie, M. H. Ismail, and M. S. El-Soudani, "Optimized Spectrum Sensing Algorithms for Cognitive LTE Femtocells", EURASIP Journal of Wireless Communications and Networking (JWCN), vol. 2012, issue 6, pp. 1-19, 2012.
Othman, A. B. M., M. H. Ismail, and M. S. El-Soudani, "Performance analysis of multiple-antenna cooperative networks under Weibull fading", AEU - International Journal of Electronics and Communications, vol. 66, no. 10, pp. 817 - 827, 2012. AbstractWebsite

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2011
Ismail, M. H., and M. M. Matalgah, Selected Novel Scenarios in Performance Evaluation of Wireless Systems, , Germany, LAMBERT Academic Publishing, 2011.
Said, L. A., A. H. Madian, M. H. Ismail, and A. M. Soliman, "Active realization of doubly terminated LC ladder filters using current feedback operational amplifier (CFOA) via linear transformation", AEU - International Journal of Electronics and Communications, vol. 65, no. 9, pp. 753 - 762, 2011. AbstractWebsite
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2010
Said, L. A., A. H. Madian, M. H. Ismail, and A. M. Soliman, "CMOS Digitally Programmable Lossless Floating Inductor", Proc. of the 2010 IEEE International Conference on Electron Devices and Solid-State Circuits (EDSSC'10),, Hong Kong, China, December, 2010.
Othman, A. - B. M., M. H. Ismail, and M. S. El-Soudani, "Pilot-Aided Channel Estimation in Cooperative SFBC-OFDM Networks", Proc. of the 2010 International Conference on Signal and Information Processing (ICSIP 2010),, Changsha, China, December, 2010.
Abdelmonem, M. A., M. Nafie, M. H. Ismail, and M. S. El-Soudani, "Coarse spectrum sensing for LTE systems", Proc. of the 17th International Conference on Telecommun. (ICT 2010), Doha, Qatar, April, 2010.
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