Variable energy adaptation for asynchronous CDMA communications over slowly fading channels

Vidhyacharan Bhaskara, Laurie L. Joinerb
Department of Electrical and Computer Engineering, University of Alabama in Huntsville, Huntsville, AL 35899, USA Received 30 September 2003, Accepted 26 October 2004. Available online 17 March 2005.


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.

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