Browsing Electrical Engineering by Author "Hafez, Mohammed"

Now showing items 1-6 of 6

    • Blind SNR Estimation of Gaussian-Distributed Signals in Nakagami Fading Channels 

      Hafez, Mohammed; Khattab, Tamer; Shalaby, Hossam M. H. ( IEEE , 2015 , Article)
      A blind (non-data-aided) SNR estimator using the statistical moments of the received signal is proposed. The proposed envelope-based non-data-aided estimator works for any time-domain Gaussian-distributed signal (e.g. OFDM ...

    • DFT-Based Multi-Directions Directional Modulation 

      Hafez, Mohammed; Khattab, Tamer; Arslan, Hüseyin ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Article)
      In this letter, a physically secure multi-directions directional modulation scheme is proposed. The scheme provides an adaptive beam-width assignment, where each user is granted a different beam width based on its channel ...

    • Modulation-independent non-data-aided SNR estimator for OFDM signals in nakagami fading channels 

      Hafez, Mohammed; Khattab, Tamer; Shalaby, Hossam (2013 , Conference Paper)
      A signal-to-noise ratio estimator for OFDM signals in Nakagami-m fading channels is proposed. This estimator can be used with any signal constellation. It is an envelope-based non-data-aided estimator that makes use of ...

    • Secure Communications Using Directional Modulation 

      Hafez, Mohammed; Khattab, Tamer; El-Fouly, Tarek; Arslan, Hüseyin ( Hamad bin Khalifa University Press (HBKU Press) , 2016 , Conference Paper)
      Limitations on the wireless communication resources (i.e., time and frequency) introduces the need for another domain that can help communication systems to match the increasing demand on high data transfer rates and quality ...

    • Secure multiple-users transmission using multi-path directional modulation 

      Hafez, Mohammed; Khattab, Tamer; Elfouly, Tarek; Arslan, Huseyin ( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)
      This work introduces a physical-layer secure multiple-users communication scheme. Our scheme employs the multi-path nature of the wireless channel to provide a different secure communication link for each of the legitimate ...

    • Secure Spatial Multiple Access Using Directional Modulation 

      Hafez, Mohammed; Yusuf, Marwan; Khattab, Tamer; Elfouly, Tarek; Arslan, Hüseyin ( Institute of Electrical and Electronics Engineers Inc. , 2018 , Conference Paper)
      In this paper, we introduce a secure multiple access scheme, which exploits the multipath structure of the channel to create a multi-user interference environment. The generated interference enables legitimate users to ...