Inter-Cell Interference (ICI) could affect the performance of the LTE-Advanced (LTE-A) system and can be evaluated according to the user’s Signal to Interference and Noise Ratio (SINR). Owing to this, the power and frequency allocation schemes can be utilized in order to attain an optimum trade-off within the obtained SINR and the resulting interference. In this study, power allocation was integrated into the Dynamic Fractional Frequency Reuse (DFFR) scheme and Network MIMO (NetMIMO) to reduce ICI and enhance the performance of LTE-A downlink. Moreover, this study focuses on the design and development of a novel power allocation algorithm, which is an extension to the previous Improved Water-Filling algorithm (IWF), namely, Low-Complexity Improved Water-Filling algorithm (LC-IWF). Results indicated a reduction in computations and enhancement in interference rejection performance in comparison to the existing algorithms by removing the Lagrange multiplier and water level. Moreover, simulation results revealed that the proposed algorithm enhances the throughput and fairness of up to 20% and 25%, respectively. Furthermore, the power consumption was reduced by 41% and the running time was 5–10 times faster than the IWF algorithm while attaining the best solution. The proposed power allocation algorithm provided a significant improvement in the performance of the NetMIMO LTE-A system, which can be extended for future 5G networks.

小区间干扰（ICI）可能会影响LTE-Advanced（LTE-A）系统的性能，并且可以根据用户的信噪比（SINR）进行评估。因此，可以利用功率和频率分配方案以便在所获得的SINR和所产生的干扰内获得最佳的折衷。在这项研究中，功率分配被集成到动态分数频率重用（DFFR）方案和网络MIMO（NetMIMO）中，以减少ICI并增强LTE-A下行链路的性能。此外，本研究集中于新型功率分配算法的设计和开发，该算法是对先前改进的注水算法（IWF）即低复杂度改进注水算法（LC-IWF）的扩展。结果表明，与现有算法相比，通过消除拉格朗日乘数和水位，计算量减少，干扰抑制性能增强。此外，仿真结果表明，该算法将吞吐量和公平性分别提高了20％和25％。此外，在获得最佳解决方案的同时，功耗降低了41％，运行时间比IWF算法快5-10倍。提出的功率分配算法极大地改善了NetMIMO LTE-A系统的性能，可以扩展到未来的5G网络。仿真结果表明，提出的算法分别将吞吐量和公平性提高了20％和25％。此外，在获得最佳解决方案的同时，功耗降低了41％，运行时间比IWF算法快5-10倍。提出的功率分配算法对NetMIMO LTE-A系统的性能进行了重大改进，可以扩展到未来的5G网络。仿真结果表明，该算法将吞吐量和公平性分别提高了20％和25％。此外，在获得最佳解决方案的同时，功耗降低了41％，运行时间比IWF算法快5-10倍。提出的功率分配算法在NetMIMO LTE-A系统的性能方面提供了重大改进，可以扩展到未来的5G网络。