TY - GEN UR - https://doi.org/10.1109/ICASSP.2019.8683216 PB - IEEE SN - 1520-6149 N2 - In this paper, we investigate the interference exploitation precoding for multi-level modulations in the downlink multi-antenna systems. We mathematically derive the optimal precoding structures based on the Karush-Kuhn-Tucker (KKT) conditions. Furthermore, by formulating the dual problem, the precoding problem for multi-level modulations can be transformed into a pre-scaling operation using quadratic programming (QP) optimization. Compared to the original second-order cone programming (SOCP) formulation, this transformation that finally leads to a QP optimization allows a considerable complexity reduction. Simulation results validate our derivations on the optimal precoding structure, and demonstrate significant performance improvements for interference exploitation precoding over traditional precoding methods for multi-level modulations. ID - discovery10082583 A1 - Li, A A1 - Masouros, C A1 - Li, Y A1 - Vucetic, B KW - interference (signal) KW - precoding KW - quadratic programming SP - 4679 AV - public Y1 - 2019/04/17/ EP - 4683 TI - Interference Exploitation Precoding for Multi-level Modulations N1 - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions. ER -