Title :
Adaptive rate and power DS/CDMA communications in fading channels
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Taejon, South Korea
fDate :
4/1/1999 12:00:00 AM
Abstract :
We investigate the average information rates attained by adapting the transmit power and the information rate relative to channel variations in code division multiple access communication systems. Our results show that the rate adaptation provides a higher average information rate than the power adaptation for a given average transmit power, and the rate increase when using rate adaptation is more significant for channels with a faster decaying multipath intensity profile and weaker line-of-sight component.
Keywords :
adaptive control; cellular radio; code division multiple access; fading channels; interference suppression; multipath channels; multiuser channels; power control; radio transmitters; radiofrequency interference; spread spectrum communication; telecommunication control; time-varying channels; DS/CDMA communications; adaptive power control; adaptive transmit power; average information rate; average information rates; average transmit power; cellular systems; channel variations; code division multiple access; fading channels; line-of-sight component; multipath intensity profile; radio link; rate adaptation; signal to interference ratio; time-varying multipath fading; Delay effects; Fading; Information rates; Interference; Multiaccess communication; Nakagami distribution; Probability density function; Radio transmitters; Random variables; Rayleigh channels;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/4234.757196
