TY  - JOUR
IS  - 9
A1  - Qin, Yuanyuan
A1  - Li, Ang
A1  - Lyu, Yuanmeng
A1  - Liao, Xuewen
A1  - Masouros, Christos
Y1  - 2024/09//
PB  - Institute of Electrical and Electronics Engineers (IEEE)
ID  - discovery10192803
N1  - This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
SN  - 1536-1276
EP  - 12498
JF  - IEEE Transactions on Wireless Communications
AV  - public
N2  - In this paper, we study symbol-level precoding (SLP) design for time-domain peak-to-average power ratio (PAPR) reduction in a multi-user MISO-OFDM transmission through the idea of constructive interference (CI). Specifically, we design the precoded transmit signals that minimize the symbol-level transmit power subject to per-antenna time-domain PAPR constraint and CI condition, using the knowledge of both data information and channel state information (CSI), based on which a non-convex problem is established. This non-convex problem is transformed into a convex one by the vectorization and relaxation method. For the relaxed problem, we employ Lagrangian method and Karush-Kuhn-Tucker (KKT) conditions to obtain a closed-form expression on the precoded signals as a function of the Lagrangian multipliers. Subsequently, we study the dual problem and obtain the optimal Lagrangian multipliers via the proposed alternating iterative algorithm. We further consider the practical communication scenario with imperfect CSI, where the original CI constraint is transformed into a probabilistic constraint in order to achieve robustness against statistically CSI errors. Numerical results validate that the proposed low-complexity algorithm achieves an enhanced performance over existing methods in terms of transmit power, PAPR and computation complexity, both in ideal perfect CSI and practical imperfect CSI cases.
VL  - 23
SP  - 12484 
UR  - http://dx.doi.org/10.1109/twc.2024.3392764
TI  - Symbol-Level Precoding for PAPR Reduction in Multi-User MISO-OFDM Systems
KW  - MU-MISO-OFDM
KW  -  peak-to-average power ratio
(PAPR)
KW  -  constructive interference (CI)
KW  -  symbol-level precoding
(SLP)
KW  -  alternating optimization
KW  -  robust design
ER  -