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標題: Multiple-length multiple-wavelength optical orthogonal codes for optical CDMA systems supporting multirate multimedia services
作者: Kwong, W.C.
Yang, G.C.
關鍵字: multimedia services
multiple data rates
optical code-division
multiple-access (O-CDMA)
optical orthogonal codes
fiberoptic networks
wireless systems
期刊/報告no:: Ieee Journal on Selected Areas in Communications, Volume 22, Issue 9, Page(s) 1640-1647.
摘要: Multiple-wavelength optical orthogonal codes (MWOOCs) with autocorrelation sidelobes and cross-correlation values of both at most one were recently proposed for wavelength-time optical code-division multiple-access (O-CDMA) systems. The codes have cardinality as a quadratic function of the number of wavelengths and find applications in high bit-rate O-CDMA systems with broadband supercontinuum lasers, in which the number of available wavelengths is larger than the number of time slots. To support multimedia services with different bit-rate and quality-of-service requirements, a new class of multiple-length constant-weight MWOOCs with autocorrelation sidelobes of zero and cross correlations of at most one is constructed algebraically in this paper. The performance of these new codes in an O-CDMA system with double-media services is analyzed. In contrary to conventional single-length codes, our study shows that the performance of these multiple-length codes improves as the code length decreases. This unique property supports "prioritization" in O-CDMA.
ISSN: 0733-8716
Appears in Collections:通訊工程研究所



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