Title :
Performance study of close-loop power control algorithms for a cellular CDMA system
Author :
Sim, Moh Lim ; Gunawan, Erry ; Soong, Boon-Hee ; Soh, Cheong-Boon
Author_Institution :
Fac. of Eng., Univ. Telekom-Multimedia, Melaka, Malaysia
fDate :
5/1/1999 12:00:00 AM
Abstract :
Performance of a reverse link code-division multiple-access (CDMA) system with fast close-loop power control algorithms is studied. It is found that if the fast close-loop power control algorithm functions effectively, the speed of the mobile unit is in the range such that its Doppler frequency is less than one tenth of the power control updating rate. This paper also proposes a new predictive power control algorithm with better performance in terms of system capacity than the conventional and adaptive step size algorithms. An increase in system capacity as high as 22% compared with the conventional algorithm can be achieved depending on the mobile velocity
Keywords :
Doppler effect; cellular radio; channel capacity; closed loop systems; code division multiple access; multiuser channels; power control; spread spectrum communication; telecommunication control; Doppler frequency; IS-95 DS-CDMA system; adaptive step size algorithms; cellular CDMA system; code-division multiple-access; fast close-loop power control algorithms; mobile unit; mobile velocity; performance; power control updating rate; predictive power control algorithm; reverse link; system capacity; Feedback; Multiaccess communication; Multiple access interference; Performance analysis; Power control; Power system modeling; Prediction algorithms; Programmable control; Shadow mapping; System performance;
Journal_Title :
Vehicular Technology, IEEE Transactions on
