Title of dissertation: ALIGNMENT AND COOPERATION FOR SECRECY IN MULTI-USER CHANNELS Raef Bassily Doctor of Philosophy, 2011 Dissertation directed by: Professor Şennur Ulukuş Department of Electrical and Computer Engineering The study of the physical layer has offered a new perspective to the problem of communication security. This led to the development of a vast set of ideas and techniques roo...

This paper investigates the anti-jamming performance of the NR-DCSK system. We consider several practical jamming environments including broad-band jamming (BBJ), partial-time jamming (PTJ), tone jamming (TJ) consisting of both single-tone and multi-tone, and sweep jamming (SWJ). We first analytically derived the bit error rates of the considered system under the BBJ and the PTJ environments in...

⎯A semi-blind source extraction algorithm for noisy mixtures based on a linear predictor is proposed. The novel algorithm is firstly validated using the benchmark data and then is applied to extract array radar signal suffering from jamming interference. The results showed that the novel algorithm can effectively extract the target signal in radar echo. Thus, it has practical application prospe...

We consider communication in the presence of hostile jamming and block-fading. The jamming signal is modeled by a Gaussian two-state hidden Markov model. Both the communication signal and the jamming signal experience fading that is constant over each packet transmission. Under this scenario, the performance is very sensitive to errors in detecting which symbols are jammed and in the estimates ...

This paper considers spectrally efficient anti-jamming system design based on message-driven frequency hopping (MDFH). Unlike conventional FH where the hopping frequencies are determined by a preselected pseudonoise (PN) sequence, in MDFH, part of the message acts as the PN sequence for carrier frequency selection. It is observed that MDFH has high spectral efficiency and is particularly robust...