TY  - GEN
N1  - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions.
A1  - Li, A
A1  - Shen, C
A1  - Liao, X
A1  - Masouros, C
A1  - Swindlehurst, AL
PB  - IEEE
KW  - MIMO
KW  -  symbol-level precoding
KW  -  constructive
interference
KW  -  interference exploitation
KW  -  optimization
AV  - public
Y1  - 2023/05/12/
SN  - 1525-3511
TI  - Block-Level Interference Exploitation Precoding without Symbol-by-Symbol Optimization
CY  - Glasgow, United Kingdom
ID  - discovery10185502
UR  - http://dx.doi.org/10.1109/wcnc55385.2023.10118875
EP  - 6
T3  - IEEE Wireless Communications and Networking Conference
N2  - Symbol-level precoding (SLP) based on the concept of constructive interference (CI) is shown to be superior to traditional block-level precoding (BLP), however at the cost of a symbol-by-symbol optimization during the precoding design. In this paper, we propose a CI-based block-level precoding (CI-BLP) scheme for the downlink transmission of a multi-user multiple-input single-output (MU-MISO) communication system, where we design a constant precoding matrix to a block of symbol slots to exploit CI for each symbol slot simultaneously. A single optimization problem is formulated to maximize the minimum CI effect over the entire block, thus reducing the computational cost of traditional SLP as the optimization problem only needs to be solved once per block. By leveraging the Karush-Kuhn-Tucker (KKT) conditions and the dual problem formulation, the original optimization problem is finally shown to be equivalent to a quadratic programming (QP) over a simplex. Numerical results validate our derivations and exhibit superior performance for the proposed CI-BLP scheme over traditional BLP and SLP methods, thanks to the relaxed block-level power constraint.
ER  -