Search

Your search keyword '"Prince, Shanthi"' showing total 278 results
Start Over Author "Prince, Shanthi"
278 results on '"Prince, Shanthi"'

150. Improvement in the Spectral Efficiency Achieved in OCDMA using 1-Dimensional OOCs.

Author

Anaman, Joseph Ofosuhene and Prince, Shanthi

Subjects
*CODE division multiple access, *CROSS correlation, *CODING theory, *OPTICAL spectra, *FORWARD error correction, *BINARY sequences, *ACQUISITION of data, *AUTOCORRELATION (Statistics)
Abstract

An optical orthogonal code (OOC) is defined as collection of binary sequences with good auto and crosscorrelation properties. Unlike bipolar code having correlation sidelobes and cross-correlation function close-to-zero, for OOC's the best correlation sidelobes and cross-correlation function is unity, which means that no distance between the positions of ones in the code are repeated. In this work, we study the spectral efficiency that can be achieved in OCDMA using the OOC's. the results are compared s with other codes in the same unipolar family. It is seen that, the maximum Spectral Efficiency that can be achieved with the unipolar codes remains low due to the positive nature of the optical channel. In effect, when power, rather than a bipolar quantity such as amplitude, represents the signal (as in incoherent all-optical systems), true code orthogonality, as traditionally defined is not achievable. In order to mitigate this limitation, Error Control Code (ECC) is used to increase the spectral efficiency of the unipolar OCDMA using OOCs. Results shows an improvement of the order of 30%. [ABSTRACT FROM AUTHOR]

Published
2012

Catalog

Books, media, physical & digital resources
See catalog results