The impact of frequency-flat fading on the spectral efficiency of CDMA

S. Shamai, S. Verdú

Research output: Contribution to journalArticlepeer-review

325 Scopus citations


The capacity of the randomly spread synchronous code-division multiple-access (CDMA) channel subject to frequency-flat fading is studied in the wide-band limit of large number of users. We find the spectral efficiency as a function of the number of users per chip, the distribution of the flat fading, and the signal-to-noise ratio (SNR), for the optimum receiver as well as linear receivers (single-user matched filter, decorrelator, and minimum mean-square error (MMSE)). The potential improvements due to both decentralized transmitter power control and multiantenna receivers are also analyzed.

Original languageEnglish (US)
Pages (from-to)1302-1327
Number of pages26
JournalIEEE Transactions on Information Theory
Issue number4
StatePublished - May 2001

All Science Journal Classification (ASJC) codes

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


  • Antenna diversity
  • Channel capacity
  • Code-division multiple access (CDMA)
  • Fading channels
  • Gaussian channels
  • Multiuser detection
  • Multiuser information theory
  • Power control
  • Spread spectrum


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