Variable-rate variable-power hybrid M-FSK M-QAM for fading channels

Fadel F. Digham*, Mohamed Slim Alouini

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

23 Scopus citations


This paper investigates a variable-rate variable-power hybrid non-coherent M-FSK M-QAM system. The goal is to combine the spectral efficiency merit of M-QAM with the power efficiency advantage of M-FSK and as such extend the region of availability even at very low channel gain values. A basic system is first designed to maximize the average spectral efficiency while meeting average power and target bit error rate constraints. In addition, a peak power constraint is imposed in a more general system. The optimization procedure leads to optimum rate and power loading functions which are compared for the different modes of operation.

Original languageEnglish (US)
Pages (from-to)1512-1516
Number of pages5
JournalIEEE Vehicular Technology Conference
Issue number3
StatePublished - 2003
Externally publishedYes
Event2003 IEEE 58th Vehicular Technology Conference, VTC2003-Fall - Orlando, FL, United States
Duration: Oct 6 2003Oct 9 2003

ASJC Scopus subject areas

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


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