Li, A;
Liu, F;
Liao, X;
Shen, Y;
Masouros, C;
(2021)
Symbol-Level Precoding Made Practical for Multi-Level Modulations via Block-Level Rescaling.
In:
2021 IEEE 22nd International Workshop on Signal Processing Advances in Wireless Communications (SPAWC).
(pp. pp. 71-75).
IEEE: Lucca, Italy.
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Abstract
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.
| Type: | Proceedings paper |
|---|---|
| Title: | Symbol-Level Precoding Made Practical for Multi-Level Modulations via Block-Level Rescaling |
| Event: | 2021 IEEE 22nd International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) |
| Dates: | 27 Sep 2021 - 30 Sep 2021 |
| ISBN-13: | 9781665428514 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/SPAWC51858.2021.9593254 |
| Publisher version: | https://doi.org/10.1109/SPAWC51858.2021.9593254 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Wireless communication, Base stations, Closed-form solutions, Precoding, Conferences, Interference, Throughput |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10144569 |
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