The paper studies the multi-user precoding problem as a non-convex optimization problem for wireless MIMO systems. In our work, we approximate the target Spectral Efficiency function with a novel computationally simpler function. Then, we reduce the precoding problem to an unconstrained optimization task using a special differential projection method and solve it by the Quasi-Newton L-BFGS iterative procedure to achieve gains in capacity. We are testing the proposed approach in several scenarios generated using Quadriga -- open-source software for generating realistic radio channel impulse response. Our method shows monotonic improvement over heuristic methods with reasonable computation time. The proposed L-BFGS optimization scheme is novel in this area and shows a significant advantage over the standard approaches.
- Pub Date:
- July 2021
- Computer Science - Information Theory;
- Computer Science - Networking and Internet Architecture
- The work was presented at the MOTOR 2021 conference. It consists of 12 pages, 5 figures, 5 tables. arXiv admin note: text overlap with arXiv:2107.00853