This dissertation considers three different aspects of modern digital communication
systems and is therefore divided in three parts.
The first part is distributed coding. This part deals with source and source-
channel code design issues for digital communication systems with many transmitters
and one receiver or with one transmitter and one receiver but with side information at
the receiver, which is not available at the transmitter. Such problems are attracting
attention lately, as they constitute a way of extending the classical point-to-point
communication theory to networks. In this first part of this dissertation, novel source
and source-channel codes are designed by converting each of the considered distributed
coding problems into an equivalent classical channel coding or classical source-channel
coding problem. The proposed schemes come very close to the theoretical limits and
thus, are able to exhibit some of the gains predicted by network information theory.
In the other two parts of this dissertation classical point-to-point digital com-
munication systems are considered. The second part is quantization of coded chan-
nel measurements at the receiver. Quantization is a way to limit the accuracy of
continuous-valued measurements so that they can be processed in the digital domain.
Depending on the desired type of processing of the quantized data, different quantizer
design criteria should be used. In this second part of this dissertation, the quantized
received values from the channel are processed by the receiver, which tries to recover
the transmitted information. An exhaustive comparison of several quantization cri-
teria for this case are studied providing illuminating insight for this quantizer design
problem.
The third part of this dissertation is faster-than-Nyquist signaling. The Nyquist
rate in classical point-to-point bandwidth-limited digital communication systems is
considered as the maximum transmission rate or signaling rate and is equal to twice
the bandwidth of the channel. In this last part of the dissertation, we question this
Nyquist rate limitation by transmitting at higher signaling rates through the same
bandwidth. By mitigating the incurred interference due to the faster-than-Nyquist
rates, gains over Nyquist rate systems are obtained.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/3231 |
| Date | 12 April 2006 |
| Creators | Liveris, Angelos Dimitriou |
| Contributors | Georghiades, Costas N. |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Dissertation, text |
| Format | 1084963 bytes, electronic, application/pdf, born digital |
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