Title :
Signal and interference statistics of a CDMA system with feedback power control
Author :
Ariyavisitakul, Sirikiat ; Chang, Li Fung
Author_Institution :
Radio Res. Div., Bellcore, Red Bank, NJ, USA
fDate :
11/1/1993 12:00:00 AM
Abstract :
Power control is essential in the use of direct-sequence code-division multiple-access (CDMA) techniques over fading radio channels. The paper investigates a feedback power control approach that allows power commands to be updated at a higher rate than the rate of multipath fading. The signal and interference statistics as received at the base stations after power control are obtained for a simulated CDMA system which includes multiple base stations with diversity receivers and a large number of power-controlled users continuously moving at various speeds. The authors show that often-used analyses based on perfect average power control lead to optimistic capacity results (by about 25%) because interference is underestimated by as much as 1 dB
Keywords :
code division multiple access; diversity reception; error statistics; fading; feedback; mobile radio systems; power control; radiofrequency interference; telecommunication channels; telecommunications control; CDMA system; base stations; capacity; direct-sequence code-division multiple-access; diversity receivers; fading radio channels; feedback power control; interference statistics; power commands; power-controlled users; signal statistics; Base stations; Error correction; Fading; Feedback; Interference; Multiaccess communication; Power control; Power system modeling; Radio link; Statistics;
Journal_Title :
Communications, IEEE Transactions on