Power Allocation in Multi User Systems with Licensed and Unlicensed Bands

In this paper, both small cell and Wi-Fi Access point conjointly deliver data to the multiple users in indoor environment. Further, to deliver the augmented data rates, small cell operates in both licensed and unlicensed bands. As a result, small cell generates interference to Wi-Fi Access Point users in unlicensed bands and to macrocell users in licensed bands. However, this produced interference is to be restricted. Moreover, total data rate rendered from both the small cell and Wi-Fi Access point is intended to be above the required limit. Thus, to comply with all these requirements and also intending to optimize the total imparted data rate, optimal power allocation is done to the Resource Blocks (or channels). While solving this optimization problem, the novelty of this paper consists of identifying the initial lagrange multipliers of the ‘Iterative Water Filling Algorithm’ (instead of considering the random values, as was carried out precedently). Finally, simulation results reveal the optimized results.