TY  - GEN
TI  - Interference Exploitation Precoding for Multi-level Modulations
SN  - 1520-6149
Y1  - 2019/04/17/
PB  - IEEE
N1  - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions.
SP  - 4679
ID  - discovery10082583
KW  - interference (signal)
KW  -  precoding
KW  -  quadratic programming
UR  - https://doi.org/10.1109/ICASSP.2019.8683216
A1  - Li, A
A1  - Masouros, C
A1  - Li, Y
A1  - Vucetic, B
EP  - 4683
AV  - public
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.
ER  -