TY  - GEN
UR  - https://doi.org/10.1109/SPAWC51858.2021.9593254
A1  - Li, A
A1  - Liu, F
A1  - Liao, X
A1  - Shen, Y
A1  - Masouros, C
EP  - 75
N2  - In this paper, we propose an interference exploitation symbol-level precoding (SLP) method for multi-level modulations via an in-block power allocation scheme to greatly reduce the signaling overhead. Existing SLP approaches require the symbol-level broadcast of the rescaling factor to the users for correct demodulation, which hinders the practical implementation of SLP. The proposed approach allows a block-level broadcast of the rescaling factor as done in traditional block-level precoding, greatly reducing the signaling overhead for SLP without sacrificing the performance. Our derivations further show that the proposed in-block power allocation enjoys an exact closed-form solution and thus does not increase the complexity at the base station (BS). In addition to the significant alleviation of the signaling overhead validated by the effective throughput result, numerical results demonstrate that the proposed power allocation approach also improves the error-rate performance of the existing SLP. Accordingly, the proposed approach enables the practical use of SLP in multi-level modulations.
AV  - public
ID  - discovery10144569
KW  - Wireless communication
KW  - 
Base stations
KW  - 
Closed-form solutions
KW  - 
Precoding
KW  - 
Conferences
KW  - 
Interference
KW  - 
Throughput
CY  - Lucca, Italy
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  - 71
TI  - Symbol-Level Precoding Made Practical for Multi-Level Modulations via Block-Level Rescaling
Y1  - 2021/11/15/
ER  -