| Autor: |
Yuanchen Wang, Eng Gee Lim, Yanfeng Zhang, Bowen Zhong, Rui Pei, Xu Zhu |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Frontiers in Signal Processing, Vol 2 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2673-8198 |
| DOI: |
10.3389/frsip.2022.837870 |
| Popis: |
Compressive sensing (CS) has been extensively employed in uplink grant-free communications, where data generated from different active users are transmitted to a base station (BS) without following the strict access grant process. Nevertheless, the state-of-the-art CS algorithms rely on a highly limited category of measurement matrix, that is, pilot matrix, which may be analyzed by an eavesdropper (Eve) to infer the user’s channel information. Thus, the physical layer security becomes a critical issue in uplink grant-free communications. In this article, the channel reciprocity in time-division duplex systems is utilized to design environment-aware (EA) pilots derived from transmission channels to prevent eavesdroppers from acquiring users’ channel information. The simulation results show that the proposed EA-based pilot approach possesses a high level of security by scrambling the Eve’s normalized mean square error performance of channel estimation. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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