Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 1990. / Thesis Advisor(s): Ha, Tri T. Second Reader: Myers, Glen A. "September 1990." Description based on title screen as viewed on March 22, 2010. DTIC Identifier(s): Marine Corps Equipment, Theses. Author(s) subject terms: VHF radio, HF radio, Single channel radio, Circuit switching, Voice Communication, Engset distribution. Includes bibliographical references (p. 63). Also available in print.

At present, optical fiber transmissions are dominated by intensity modulation and direct detection, which fundamentally limit the signal processing capabilities in optical fiber networks. On the other hand, manipulation of optical phase enables advanced signal processing techniques for various applications. This thesis includes three parts and makes contributions in three research areas in optical fiber networks, by applying optical and electronic signal processing techniques. In the first part of the thesis, optical signal processing is employed to realize a novel all-optical label swapping (AOLS) technique using synchronous phase modulation. This technique is shown to address the forwarding speed bottleneck in optical packet switched networks (OPSN). By exploiting the unique symmetry of phase-shift keying (PSK), for the first time, label erasure and insertion are performed in a single step by a phase modulator without wavelength conversion. We also propose and demonstrate a polarization insensitive phase modulator to address the polarization sensitivity of AOLS. Furthermore, we emulate multi-hop all-optical label swapping in a re-circulating loop to investigate the power penalties from the accumulated phase errors and the timing mismatch. Based on the experimental and analytical results, we show that this technique can save wavelength converters significantly if compared with conventional AOLS techniques requiring dedicate wavelength converters.

Thesis (Electrical Engineer and M.S. in Electrical Engineering)--Naval Postgraduate School, June 2010. / Thesis Advisor(s): Robertson, R. Clark; Second Reader: Kragh, Frank; Cristi, Roberto. "June 2010." Description based on title screen as viewed on July 14, 2010. Author(s) subject terms: Hybrid Reed-Solomon (RS) coding, Orthogonal signaling, Additive White Gaussian Noise (AWGN), Pulse-Noise Interference (PNI), coherent detection, noncoherent detection. Includes bibliographical references (p. 101-103). Also available in print.

No description available.

Thesis (Ph.D.)--University of Delaware, 2006. / Principal faculty advisor: M. Sandra Carberry, Dept. of Computer and Information Sciences. Includes bibliographical references.

Thesis (Ph. D.)--University of Virginia, 2000. / Spine title: Neuregulin signaling at the synapase. Includes bibliographical references. Also available online through Digital Dissertations.

Thesis (Ph. D.)--University of Virginia, 2001. / Includes bibliographical references (leaves 187-202). Also available online through Digital Dissertations.

This thesis investigates various detection processes that operate with known time invariant channels. The investigations are divided into two main areas, the first of which involves uncoded digital signals. Three different detection processes have been studied here and some promising systems have been developed from these. The first of the detection processes is an iterative detection process whereas the second detection process involves the linear filtering of the received signal. Binary signals are considered in the investigations here. The third detection process achieves the near-maximum likelihood detection of a 16-point QAM digital signal transmitted over a telephone circuit at 9600 bits/second. The detector here operates on the received sample values directly without using any complex prefiltering. The second area of investigation covered in this thesis involves coded digital signals. Binary and 16-point QCM signals have been considered here. Rate2 and 3 non-systematic convolutional codes with optimum free distance have been used in conjunction with the appropriate Gray codes for the encoding of the signals. At the receiving end, a joint near-maximum likelihood detection/decoding process is used. Computer simulation tests have shown that the system improves the tolerance to Gaussian noise over the corresponding uncoded system at low error rates.

Sexually-selected communication signals can be used by competing males to settle contests without incurring the costs of fighting. The ability to dynamically regulate the signal in a context-dependent manner can further minimize the costs of male aggressive interactions. Such is the case in the gymnotiform fish Brachyhypopomus gauderio, which, by coupling its electric organ discharge (EOD) waveform to endocrine systems with circadian, seasonal, and behavioral drivers, can regulate its signal to derive the greatest reproductive benefit. My dissertation research examined the functional role of the EOD plasticity observed in male B. gauderio and the physiological mechanisms that regulate the enhanced male EOD. To evaluate whether social competition drives the EOD changes observed during male-male interactions, I manipulated the number of males in breeding groups to create conditions that exemplified low and high competition and measured their EOD and steroid hormone levels. My results showed that social competition drives the enhancement of the EOD amplitude of male B. gauderio. In addition, changes in the EOD of males due to changes in their social environment were paralleled by changes in the levels of androgens and cortisol. I also examined the relationship between body size asymmetry, EOD waveform parameters, and aggressive physical behaviors during male-male interactions in B. gauderio, in order to understand more fully the role of EOD waveforms as reliable signals. While body size was the best determinant of dominance in male B. gauderio, EOD amplitude reliably predicted body condition, a composite of length and weight, for fish in good body condition. To further characterize the mechanisms underlying the relationship between male-male interactions and EOD plasticity, I identified the expression of the serotonin receptor 1A, a key player in the regulation of aggressive behavior, in the brains of B. gauderio. I also identified putative regulatory regions in this receptor in B. gauderio and other teleost fish, highlighting the presence of additional plasticity. In conclusion, male-male competition seems to be a strong selective driver in the evolution of the male EOD plasticity in B. gauderio via the regulatory control of steroid hormones and the serotonergic system.

Master’s thesis deals with possibilities of data communication on low voltage power lines, so-called PLC. This technology allows data transfer on power lines. According frequency band the PLC can be subdivide into narrowband or broadband class. Given are theoretical knowledge’s of data communication on power lines and describes technical solutions. Consequently is suggestion of LAN, which is accessible for commercial usage made by DS2 and his suitable for home use. The main acquisition is implementing and measuring this experimentally created LAN in family house. The results are real bitrates depending on distance and quality of specific connection.