Variable energy adaptation for asynchronous CDMA communications over slowly fading channels

  • Authors:

  • Vidhyacharan Bhaskar;Laurie L. Joiner

  • Affiliations:

  • Departement Genie des Systemes d'lnformation et de Telecommunication, Universite de Technologie de Troyes, 12 Rue Marie Curie, 10010 Troyes Cedex, France;Department of Electrical and Computer Engineering, University of Alabama in Huntsville, Huntsville, AL 35899, USA

  • Venue:
  • Computers and Electrical Engineering
  • Year:
  • 2005

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Abstract

In this paper, a detailed theoretical analysis of variable energy adaptation in an asynchronous code division multiple access (A-CDMA) system is discussed. Rayleigh and Rician frequency-selective slowly fading channels are considered. The receiver, capable of measuring the received signal energy-to-noise ratio, provides the transmitter with the necessary signal-to-noise ratio measurement to control the transmitter energy through a noise-free feedback channel. System parameters such as fading margin and mean transmitter energy gain are calculated for both Rayleigh and Rician fading channels as a function of the probability of error specification and the probability of unsatisfactory operation.