Wireless systems and interference avoidance

Christopher Rose, Sennur Ulukus, Roy D. Yates

Research output: Contribution to journalArticlepeer-review

176 Scopus citations


Motivated by the emergence of programmable radios, we seek to understand a new class of communication system where pairs of transmitters and receivers can adapt their modulation/demodulation method in the presence of interference to achieve better performance. Using signal to interference ratio as a metric and a general signal space approach, we present a class of iterative distributed algorithms for synchronous systems which results in an ensemble of optimal waveforms for multiple users connected to a common receiver (or colocated independent receivers). That is, the waveform ensemble meets the Welch Bound with equality and, therefore, achieves minimum average interference over the ensemble of signature waveforms. We derive fixed points for a number of scenarios, provide examples, look briefly at ensemble stability under user addition and deletion as well as provide a simplistic comparison to synchronous code-division multiple-access. We close with suggestions for future work.

Original languageEnglish (US)
Pages (from-to)415-428
Number of pages14
JournalIEEE Transactions on Wireless Communications
Issue number3
StatePublished - 2002

ASJC Scopus subject areas

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


  • Adaptive modulation
  • Code-division multiple-access systems
  • Codeword optimization
  • Interference avoidance
  • Multiuser detection
  • Sum capacity
  • Vector channels


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