Capacity-Share Controlled Information-Theoretic Sum Capacity of Reverse Link Single-Cell CDMA Systems
Arash Abadpour, Attahiru Sule Alfa, Anthony C. K. Soong · 2007
By controlling the pattern of transmission powers of the stations in a CDMA system, the aggregate capacity of the reverse link can be optimized. To make this problem practically applicable, appropriate constraints should be added to it. In previous research, bounds on transmission power, lower limit on signal to noise ratio, and maximum capacity of single stations plus a maximum bound on the aggregate transmission power of the system were considered. However, none of these constraints directly controls the capacity share of the single stations. Hence, the solution might exhibit a transmission power pattern in which, for example, one third of the whole capacity is given to a single station. This increases the probability of the base station depending massively on one station, resulting in a major loss when that station stops transmitting. In this paper, we introduce another constraint into the available set. This way, we reformulate the available problem by adding a maximum capacity share constraint to it and propose an algorithm for solving it. The paper includes mathematical analysis of the problem and experimental results.