Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/46835
標題: Shifted carrier-hopping prime codes for multicode keying in wavelength-time O-CDMA
作者: Narimanov, E.
楊谷章
Kwong, W.C.
Yang, G.C.
Prucnal, P.R.
關鍵字: multicode keying
optical code-division multiple-access (O-CDNM)
optical codes
wavelength-hopping time-spreading
optical cdma
performance analysis
system
networks
security
design
期刊/報告no:: Ieee Transactions on Communications, Volume 53, Issue 12, Page(s) 2150-2156.
摘要: In this paper, we study the use of shifted carrier-hopping prime codes (CHPC) for multicode keying in wavelength-time optical code-division multiple-access (O-CDMA) systems. By using the code's good properties of zero autocorrelation sidelobes and cross-correlation functions of at most one, each user is assigned M = 2(m) shifted copies of its own code matrix to represent m data bits per symbol with minimal interference. The advantages of our scheme are that: 1) a lower baud rate O-CDMA system can now support a higher bit rate; 2) no network synchronization is required; 3) no M-fold increase in code cardinality is needed, as compared with standard M-code keying; 4) the numbers of optical encoders and decoders can be reduced from M to one per user, a major hardware cost savings; and 5) user code confidentiality is enhanced, as compared with the transmission of one code matrix for each data-bit one in conventional "on-off keying" O-CDMA schemes. Finally, our performance analysis shows that there is a tradeoff between the error probability and the choice of M.
URI: http://hdl.handle.net/11455/46835
ISSN: 0090-6778
文章連結: http://dx.doi.org/10.1109/tcomm.2005.860041
Appears in Collections:通訊工程研究所

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