Modulation optimization under energy constraints

Shuguang Cui, Andrea J. Goldsmith, Ahmad Bahai

Research output: Contribution to journalConference articlepeer-review

144 Scopus citations


We consider radio applications where the nodes operate on batteries so that energy consumption must be minimized while satisfying given throughput and delay requirements. In this context, we analyze the best modulation strategy to minimize the total energy consumption required to send a given number of bits. The total energy consumption includes both the transmission energy and the circuit energy consumption. We show that for both MQAM and MFSK the transmission energy decreases with the BTon product while the circuit energy consumption increases with Ton, where B is the modulation bandwidth and Ton is the transmission time. Thus, in short-range applications where the circuit energy consumption is nonnegligihle compared with the transmission energy, the total energy consumption is minimized by using the maximum system bandwidth along with an optimized transmission time Ton. We derive this optimal Ton for MQAM and MFSK modulation in both AWGN channels and Rayleigh fading channels. Our optimization considers both delay and peak-power constraints. Numerical examples are given, where we exhibit up to 68% energy savings over modulation strategies that minimize the transmission energy alone.

Original languageEnglish (US)
Pages (from-to)2805-2811
Number of pages7
JournalIEEE International Conference on Communications
StatePublished - 2003
Externally publishedYes
Event2003 International Conference on Communications (ICC 2003) - Anchorage, AK, United States
Duration: May 11 2003May 15 2003

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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