Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 261 for “"Communication channels"”.
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Error bounds for parallel communication channels.
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Electrical Engineering, 1965
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Characterization of Ultra Wideband Communication Channels
Ultra-wideband (UWB) communication has been the subject of extensive research in recent years due to its unique capabilities and potential applications, particularly in short-range multiple access wireless communications. However, many important aspects of UWB-based communication systems have not …
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Error-correction on non-standard communication channels
Many communication systems are poorly modelled by the standard channels assumed in the information theory literature, such as the binary symmetric channel or the additive white Gaussian noise channel. Real systems suffer from additional problems including time-varying noise, cross-talk, …
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Generalized Data-Aided Equalizers for Digital Communication Channels
Although, the ACE structure has advantages in implementations of pipelined structure and canceller structure, we found that the performance of the ACE depends on the channel characteristics. Comparing the ACE with the DFE, the performance of the ACE is not always better than the performance of the …
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Diversity and MIMO for body-centric wireless communication channels
Due to its increasing applications in personal communications systems, body-centric wireless communications has become a major field of interest for researchers. Fading and interference are the two concerns that affect the reliability and quality of service of wireless links. Diversity has been …
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Models and Efficient Receivers for Communication Channels With Memory
Made available in DSpace on 2014-12-12T20:54:34Z (GMT). No. of bitstreams: 1 7709225.pdf: 3689826 bytes, checksum: 6a0b7d704073d46f7146ff91cf00a053 (MD5) Previous issue date: 1976
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Multiple-user quantum information theory for optical communication channels
… capacity theorems for point-to-point bosonic channels with additive thermal noise, under the presumption of a conjecture on the minimum output von Neumann entropy. In the first part of this thesis, we evaluate the optimum capacity for free-space line-of-sight optical communication using …
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MIMO MC-CDMA Systems over indoor optical wireless communication channels
Optical wireless communication systems offer a number of advantages over their radio frequency counterparts. The advantages include freedom from fading, freedom from spectrum regulations and abundant bandwidth. The main limitations of optical wireless systems include background noise attributed to …
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Cooperative strategies for pairwise secure communication channels in sensor networks
Establishing secure communication channels in sensor networks is made especially difficult because of low power resources, hostile environments, and wireless communication. The power requirements of traditional cryptographic methods create the need for alternative strategies for secure …
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Polarization behaviour of on-body communication channels at 2.45 GHz
The advent of body worn devices and the use of them for a wide range of applications, from entertainment to military purposes, indicate the need to investigate to the behaviour of antennas and wave propagation on the body in depth. Knowledge and understanding and of the on-body channel can lead to …
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Simulation and Estimation Techniques for Wideband High-Frequency Communication Channels
… parameters for wideband high frequency (WBHF) communication systems is analyzed. To explore the technique, a WBHF communication system is simulated in software using three new channel models. One channel model is based on a simulation of wave propagation in the ionosphere, while another model …
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Estimation and tracking of rapidly time-varying broadband acoustic communication channels
… for estimating wideband shallow-water acoustic communication channels. The very shallow water wideband channel has three distinct features: large dimension caused by extensive delay spread; limited number of degrees of freedom (DOF) due to resolvable paths and inter-path correlations; and rapid …
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Communication channels and the formation of attitudes toward funding public schools
<p>This study examines San Joaquin County parents' and guardians' media use, interpersonal discussion and attitudes toward funding public schools. Specifically, it investigated the effect of media use on the salience of funding for public schools and how it may be mediated by interpersonal …
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Theoretical and Experimental Investigation and Characterizations of Ionospheric HF Communication Channels
… measurement. The channel is addressed from the communication perspective. Signal distortions due to both the deterministic dispersive background ionosphere and random electron density fluctuations are studied.
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Preserving safety in distributed cyber physical systems with unreliable communication channels
… objects in the physical world with the aid of communication channels. Additionally, due to their nature, most CPS are safety-critical systems where there are safety invariant that need to be preserved. The big challenge is that communication channels are unreliable meaning that there may not be …
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Estimation and tracking of rapidly time-varying broadband acoustic communication channels
… for estimating wideband shallow-water acoustic communication channels. The very shallow water wideband channel has three distinct features: large dimension caused by extensive delay spread; limited number of degrees of freedom (DOF) due to resolvable paths and inter-path correlations; and rapid …
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Analysis of modern analog and digital communication channels from a manager's perspective
This thesis presents the fundamental communication transmission principles which define the performance characteristics cf the transmission channel. The subject matter is divided into three categories (1) antennas, (2) transmission lines, and (3) waveguides. The scope of presentation is results …
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Transmission Strategies for Wireless Multi-user, Multiple-Input, Multiple-Output Communication Channels
… (MIMO) processing techniques for wireless communication are of interest for next-generation systems because of their potential to dramatically improve capacity in some propagation environments. When used in applications such as wireless LAN and cellular telephony, the MIMO processing …
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Design and implementation of a methodology to characterize indoor visible light communication channels
Understanding the channel behavior in communication systems is important for ensuring reliable and robust connectivity. This is also true for Visible Light Communication systems in different environments and scenarios. In this work, we develop an adaptable, simple, and reliable method to quantify, …
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Engineering Redox-based Intercellular Communication Channels Towards the Control of Microbial Consortial Behavior
… participate in various modes of intercellular communication, a process in which cells relay information across potentially large distances through molecular interactions. The advent of synthetic biology has enabled facile manipulation of the genetic architectures governing these intercellular …
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