Interception Probability versus Capacity in Wideband Systems: The Benefits of Peaky Signaling

Diana C. Gonzalez, Claudio F. Dias, Eduardo R. Lima, Yonina C. Eldar, Muriel Medard, Michel Daoud Yacoub

Research output: Contribution to journalArticlepeer-review


Spread-spectrum techniques have found extensive use in broadband communications, both in military and commercial applications, for their low interception probability. However, it has been shown that these techniques prove ineffective on non-coherent fading channels with very large bandwidths since its capacity decreases with the increase of the bandwidth, eventually going to zero as the bandwidth goes to infinity. Peaky frequency-shift keying is a promising alternative modulation technique expected to achieve high data rates while maintaining a low interception probability. The current study explores such modulation techniques and outlines the conditions for which the reliability and capacity of the system increase while reducing the probability of interception compared to typical spread spectrum schemes. We show that peaky frequency-shift keying achieves a considerably higher transmission rate than non-peaky signaling for any given target level of interception probability, especially for outdoor fading scenarios in the low signal-to-noise ratio regime.

Original languageEnglish
Pages (from-to)1
Number of pages1
JournalIEEE Access
StateAccepted/In press - 2023
Externally publishedYes


  • Bandwidth
  • Direct-sequence spread
  • Fading channels
  • Frequency shift keying
  • Security
  • Symbols
  • Time-frequency analysis
  • Wideband
  • peaky frequency-shift keying
  • probability of interception
  • wideband channel

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)
  • Electrical and Electronic Engineering


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