Browsing by Author "Hafez, Mohammed"
Now showing items 1-7 of 7
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Channel independent physical layer security
Ankaralı, Zekeriyya Esat; Yılmaz, Mustafa Harun; Hafez, Mohammed; Arslan, Hüseyin (Institute of Electrical and Electronics Engineers Inc., 2016)Security is one of the key requirements of wireless communication systems. By exploiting the broadcast nature of wireless medium, a malicious user might attempt to mislead the legitimate nodes, intercept the communication ... -
DFT-based multi-directions directional modulation
Hafez, Mohammed; Khattab, Tamer; Arslan, Hüseyin (Institute of Electrical and Electronics Engineers, 2019)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 ... -
On directional modulation: An analysis of transmission scheme with multiple directions
Hafez, Mohammed; Arslan, Hüseyin (Institute of Electrical and Electronics Engineers, 2015)Increasing the spectral efficiency was always the motivation behind the evolution of wireless communication systems. Also, due to the widespread usage of wireless systems, securing the transmitted data rises as a main ... -
Reducing precoder/channel mismatch and enhancing secrecy in practical MIMO systems using artificial signals
Peköz, Berker; Hafez, Mohammed; Köse, Selçuk; Arslan, Hüseyin (IEEE - Institute of Electrical and Electronics Engineers, Inc, 2020)Practical multiple-input-multiple-output (MIMO) systems depend on a predefined set of precoders to provide spatial multiplexing gain. This limitation on the flexibility of the precoders affects the overall performance. ... -
Secure multiple-users transmission using multi-path directional modulation
Hafez, Mohammed; Khattab, Tamer; Elfouly, Tarek; Arslan, Hüseyin (Institute of Engineers and Everyone Else, 2016)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 (IEEE-Institute of Electrical and Electronics Engineers Inc, 2018)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 ... -
Thresholds optimization for one-bit feedback multi-user scheduling
Hafez, Mohammed; El Shafie, Ahmed; Shaqfeh, Mohammed; Khattab, Tamer; Alnuweiri, Hussein; Arslan, Hüseyin (Institute of Electrical and Electronics Engineers Inc., 2018)We propose a new one-bit feedback scheme with scheduling decision based on the maximum expected weighted rate. We show the concavity of the 2-user case and provide the optimal solution which achieves the maximum weighted ...
