Uplink Pilot and Data Power Control for Single Cell Massive MIMO Systems with MRC
It provides a practical optimization framework for energy-efficient uplink transmission in massive MIMO systems, though the contribution is incremental as it extends known methods to a specific scenario.
This paper derives a closed-form solution for optimal training interval length and proposes power control policies for pilot and data in single-cell massive MIMO, achieving up to 50% improvement in minimum spectral efficiency over heuristic approaches.
This paper considers the jointly optimal pilot and data power allocation in single cell uplink massive MIMO systems. A closed form solution for the optimal length of the training interval is derived. Using the spectral efficiency (SE) as performance metric and setting a total energy budget per co- herence interval the power control is formulated as optimization problems for two different objective functions: the minimum SE among the users and the sum SE. The optimal power control policy is found for the case of maximizing the minimum SE by converting it to a geometric program (GP). Since maximizing the sum SE is an NP-hard problem, an efficient algorithm is developed for finding KKT (local maximum) points. Simulation results show the advantage of optimizing the power control over both pilot and data power, as compared to heuristic power control policies.