Paper Info
Title
Secure Directional Modulation With Few-Bit Phase Shifters: Optimal and Iterative-Closed-Form Designs
Abstract
In this paper, directional modulation (DM) is investigated to enhance physical layer security. Practical transmitter designs are exploited under imperfect channel state information (CSI) and hardware constraints, such as finite-resolution phase shifters (PSs) and per-antenna power budget. Tailored for the practical issues in realizing DM, a series of practical scenarios are investigated. Starting from the scenario where eavesdroppers (Eve)s' information is completely unknown, corresponding designs are proposed to optimize legitimate users (LU)s' receiving performance while randomizing the Eves' received signal. When the Eves' CSI is imperfectly known, in the second scenario, the Eves' receiving performance is further deteriorated by imposing destructive interference to the Eves. For each scenario, three algorithms are proposed under hardware constraints and imperfect CSI, i.e., one direct-mapping algorithm suitable for high/moderate number of bits in PSs, one heuristic algorithm with improved receiving performance at the cost of complexity, and one iterative-closed-form algorithm with enhanced practicality of symbol-level based DM. Simulation demonstrates that the algorithms achieve lower symbol error rate (SER) at the LUs while significantly deteriorating the Eves' SER, leading to an improved secrecy throughput over the benchmarks.
Year
DOI
Venue
2021
10.1109/TCOMM.2020.3032459
IEEE Transactions on Communications
Keywords
DocType
Volume
Directional modulation,hardware impairments,imperfect channel estimation,interference exploitation,iterative-closed-form precoding,physical layer security
Journal
69
Issue
ISSN
Citations 
1
0090-6778
3
PageRank 
References 
Authors
0.39
0
3
Name
Order
Citations
PageRank
Zhongxiang Wei1233.71
Christos Masouros2126394.92
Fan Liu325515.73