Noncoherent Rician fading channel - Part II: Spectral efficiency in the low-power regime

Mustafa Cenk Gursoy, H. Vincent Poor, Sergio Verdú

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Transmission of information over a discrete-time memoryless Rician fading channel is considered, where neither the receiver nor the transmitter knows the fading coefficients. The spectral-efficiency/bit-energy tradeoff in the low-power regime is examined when the input has limited peakedness. It is shown that if a fourth-moment input constraint is imposed, or the input peak-to-average power ratio is limited, then in contrast to the behavior observed in average-power-limited channels, the minimum bit energy is not always achieved at zero spectral efficiency. The low-power performance is also characterized when there is a fixed peak limit that does not vary with the average power. A new signaling scheme that overlays phase-shift keying on ON-OFF keying (OOK) is proposed and shown to be optimally efficient in the low-power regime.

Original languageEnglish (US)
Pages (from-to)2207-2221
Number of pages15
JournalIEEE Transactions on Wireless Communications
Issue number5
StatePublished - Sep 2005
Externally publishedYes


  • Fading channels
  • Low-power regime
  • Memoryless fading
  • Peak constraints
  • Rician fading
  • Spectral efficiency

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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