Spectral efficiency in the wideband regime

Sergio Verdú

Research output: Contribution to journalArticlepeer-review

991 Scopus citations


The tradeoff of spectral efficiency (b/s/Hz) versus energy-per-information bit is the key measure of channel capacity in the wideband power-limited regime. This paper finds the fundamental bandwidth-power tradeoff of a general class of channels in the wideband regime characterized by low, but nonzero, spectral efficiency and energy per bit close to the minimum value required for reliable communication. A new criterion for optimality of signaling in the wideband regime is proposed, which, in contrast to the traditional criterion, is meaningful for finite-bandwidth communication.

Original languageEnglish (US)
Pages (from-to)1319-1343
Number of pages25
JournalIEEE Transactions on Information Theory
Issue number6
StatePublished - Jun 2002

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Computer Science Applications
  • Library and Information Sciences


  • Antenna arrays
  • Channel capacity
  • Fading channels
  • Noisy channels
  • Spectral efficiency
  • Wideband regime


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