Robust Beamforming Design for Covert Communications

Scalable System Design for Covert Mimo Communications Dissertation

Adaptive Beamforming for Acoustic Communications

The basic factors which need to be considered in the design of a practical through water communications system utilising an adaptive beamformer at the receiver are examined. Simulation results demonstrate the feasibility of using such a scheme. It is clear that the multipath phenomenon which has proved so detrimental to a high data rate through water communications link may be effectively count...

Covert underwater acoustic communications.

Low probability of detection (LPD) communications are conducted at a low received signal-to-noise ratio (SNR) to deter eavesdroppers to sense the presence of the transmitted signal. Successful detection at intended receiver heavily relies on the processing gain achieved by employing the direct-sequence spread-spectrum (DSSS) technique. For scenarios that lack a sufficiently low SNR to maintain ...

Exploiting Wireless Systems for Covert Communications

Committee: Chairperson Date iii Alhamdulilah To my family for helping raise me up To Dr. Frost for taking me under his wing iv Acknowledgement I would first and foremost like to thank God. He taught me what I knew not. When one reflects upon his accomplishments he realizes that he is deserving of very little credit. And if it were not for those around him he would never have accomplished so muc...

Covert Communications Employing Wavelet Technology

1 Atlantic Aerospace and Aware are developing a novel class of spread spectrum system architectures for covert communications based on the theory of wavelets. We describe a class of spread spectrum waveforms that are: (1) highly efficient in their use of signal energy; ( 2 ) indistinguishable in appearance from bandpass Gaussian noise; (3) devoid of secondand fourth-order cyclostationary featur...