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    Advanced cross-layer secure communication designs for future wireless systems
    (İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018) Hamamreh, Jehad Mahmoud Amin; Arslan, Hüseyin
    Due to the inherent vulnerability of wireless transmission to eavesdropping, con- dentiality arises as a challenging issue especially for future wireless networks because of their unique requirements. To cope with this, physical layer security (PLS) has emerged as a new concept and prospective solution that can complement and even replace encryption-based methods, which entail many practical problems that may impede its implementation and adoption in future wireless networks. To address this challenge, in this thesis, novel, advanced and cross physical (PHY) and media access control (MAC) layer security designs are developed for providing con dentiality against eavesdropping in future wireless networks. The conducted research studies encompass the following main approaches. I) Cross PHY/MAC layer security techniques using: 1) Automatic-repeat-request (ARQ) with maximal ratio combination (MRC) and adaptive modulation; 2) ARQ with MRC and null-space-independent arti cial noise. II) Security techniques for orthogonal frequency-division multiplexing (OFDM)-based waveforms. This includes developing new designs that cover the following topics: 1) OFDM with adaptive interleaving and precoding. 2) OFDM with subcarrier index selection for enhancing security and reliability of 5G services. 3) Cyclic pre x (CP)-less OFDM with alignment signals for enhancing spectral e ciency, reducing latency, and improving PHY security of 5G and beyond services. III) New inherently secure waveform designs, where a secure channel-based transform waveform, referred to as orthogonal transform division multiplexing (OTDM) waveform, is developed and proposed for future 5G wireless systems. Then, its time-frequency characteristics are investigated along with devising a method to reduce its peak to average power ratio. IV) Security designs for orthogonal space-time block coding (OSTBC)-based multi-input-single-output (MISO) systems, where precoding matrix indicators (PMI) are utilized and redesigned for providing secrecy.