Enhanced Capacity for Multi-Cell OFDMA Systems with Efficient Power Control and Reuse Partitioning

The increasing demand for high data rate services has created an acute requirement for efficient subcarrier assignment and power control algorithms in orthogonal frequency division multiple access (OFDMA) systems. Resource allocation optimization becomes even more constraining in multi-cell OFDMA systems because of the presence of co-channel interference (CCI). In this paper, we mitigate the CCI impact with a particular frequency reuse partitioning strategy. We propose a new centralized and low-complexity algorithm that minimizes the outage probability in the entire system. With this algorithm, adaptive frequency reuse factors are applied according to users' bandwidth requirements. We also apply a power control scheme that improves system capacity without increasing the CCI level. Simulation results show its efficiency for high bit rate services