Shifted carrier-hopping prime codes for multicode keying in wavelength-time O-CDMA

Evgenii Narimanov, Wing C. Kwong, Guu Chang Yang, Paul R. Prucnal

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


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 = 2m 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.

Original languageEnglish (US)
Pages (from-to)2150-2156
Number of pages7
JournalIEEE Transactions on Communications
Issue number12
StatePublished - Dec 2005

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


  • Multicode keying
  • Optical code-division multiple-access (O-CDMA)
  • Optical codes
  • Wavelength-hopping time-spreading


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