A Distributed Power Control Algorithm based on three-valued power update coefficients in CDMA mobile communication networks

摘要

In CDMA all users transmits on the same frequency, which provides more capacity and better QOS as compared to the GSM. However, the capacity of CDMA is affected by the near-far problem which degrades the performance of users far away from the BSs. It is due to the interference generated within the CDMA system because of the two distinct received powers from the contiguous and distant mobile users. This causes noise and cancellation of signals in most adversary conditions which leads to decrease in capacity. In this paper, a new Distributed Power Control Algorithm is proposed for 3G users based on three-valued power update coefficients (≥5, between 2 and 5; and ≤2). This algorithm is implemented at BS for three static users of a cell with equal SIRs for above or below a threshold at every epoch with 16 iterations. The proposed algorithm effectively controls the user power levels of 3G and beyond 3G systems.