Direct-detection optical asynchronous CDMA systems with double optical hard-limiters: APD noise and thermal noise

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Performance of optical asynchronous code-division multiple-access (CDMA) systems with double optical hard-limiters is analyzed in the presence of avalanche photodiode (APD) noise and thermal noise. Optical orthogonal codes (OOC's) are employed as signature sequence codes. In the analysis, chips are assumed to be synchronous among users: the chip synchronous case. Thus, the performance results in the upper bound on the performance of the asynchronous system. The results show that the optical asynchronous CDMA systems with double optical hard-limiters have good performance in the presence of the APD noise and the thermal noise even when the number of simultaneous users is large.

Original languageEnglish
Pages (from-to)1491-1499
Number of pages9
JournalIEICE Transactions on Communications
Issue number7
Publication statusPublished - 1998 Jan 1
Externally publishedYes



  • APD noise
  • CDMA
  • Channel interference
  • Double optical hard-limiters
  • Thermal noise

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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