The objective of the research is to establish basic design principles to achieve robust communication over channels corrupted by thermal noise and by unknown interfering signals of bounded power, using pseudo-random communication systems. This work will complement and extend current research on communication using error-control coding, interleaving and spread-spectrum modulation. Such systems are special cases of those considered in this research project. Two general issues are addressed. The first aims at establishing the potential coding gain offered by pseudo-random communication systems. This question will be addressed in the context of code-division multiple-access and interference suppression (anti-jamming) applications. A key aspect of this problem is to quantify the role of interleaving in robust systems. In the second part of this research, the principal investigator will introduce and examine the structure and performance of a new class of robust coding systems, called pseudo-random codes, which generalize coding systems with interleaving and spread-spectrum modulation. As in spread- spectrum these codes are driven by pseudo-random parameters; however, coding, interleaving and spectral spreading are performed simultaneously. Theoretical results show that within this family of codes are some that, in some situations, achieve coding gains much greater than those that can be achieved with spread-spectrum techniques for the same expended power, bandwidth and complexity.//

Agency
National Science Foundation (NSF)
Institute
Division of Computer and Communication Foundations (CCF)
Application #
8804257
Program Officer
Dwight D. Fisher
Project Start
Project End
Budget Start
1988-08-15
Budget End
1991-01-31
Support Year
Fiscal Year
1988
Total Cost
$59,993
Indirect Cost
Name
Johns Hopkins University
Department
Type
DUNS #
City
Baltimore
State
MD
Country
United States
Zip Code
21218