Time-varying multichirp rate modulation for multiple access systems

Hao Shen, Srinivasa Machineni, Charu Gupta, Antonia Papandreou-Suppappola

Research output: Contribution to journalLetterpeer-review

39 Scopus citations


We propose a modulation scheme that is based on wideband time-varying chirp signals for use in frequency-hopped code division multiple-access systems. The scheme is designed such that each user is assigned unique modulating chirp signals that efficiently occupy the hop bandwidth for identification at the receiver. We explain how the chirp modulation reduces multiple-access interference, and we demonstrate with simulations our improved performance for various fading channels. The bandwidth efficiency of the chirp signaling is further exploited by assigning multiple chirp rates to each user.

Original languageEnglish (US)
Pages (from-to)497-500
Number of pages4
JournalIEEE Signal Processing Letters
Issue number5
StatePublished - May 2004


  • Frequency-hopped code division multiple-access (FH-CDMA)
  • Linear chirp
  • Multiple-access interference (MAI)
  • Time varying

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering
  • Applied Mathematics


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