Adaptive turbo-coded modulation for flat-fading channels

Sriram Vishwanath, Andrea Goldsmith

Research output: Contribution to journalArticlepeer-review

69 Scopus citations


In this paper, we consider a turbo-coded system employed on a flat-fading channel where the transmitter and receiver adapt the encoder, decoder, modulation scheme, and transmit power to the state of the channel. Assuming instantaneous and error-free channel gain and phase knowledge at the transmitter and the receiver, we determine the optimal adaptation strategy that maximizes the throughput of this system, while achieving a given bit-error rate under an average power constraint. Our optimized adaptive modulation strategy is based on an extensive set of existing turbo-coded modulation schemes. We find that adapting both the turbo encoder (rate) and the transmit power can achieve performance within 3 dB of the fading channel capacity.

Original languageEnglish (US)
Pages (from-to)964-972
Number of pages9
JournalIEEE Transactions on Communications
Issue number6
StatePublished - Jun 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


  • Adaptive modulation
  • Coded modulation
  • Concatenated codes
  • Fading channels


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