Signal and interference statistics of a CDMA system with feedbackpower control |
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Authors: | Ariyavisitakul S Li Fung Chang |
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Affiliation: | Radio Res. Div., Bellcore, Red Bank, NJ; |
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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 |
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