Physical-Layer Secrecy for OFDM Transmissions Over Fading Channels

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Renna, F (Author) FCUP; Laurenti, N (Author) Other; Poor, HV (Author) Other

Journal

Title: IEEE Transactions on Information Forensics and Security

Vol. 7 No. 1

Pages: 1354-1367

ISSN: 1556-6013

Publisher: IEEE

Indexing

ISI Web of Knowledge - 82 Citations

Scopus - 88 Citations

Other information

Authenticus ID: P-002-7KP

DOI: 10.1109/tifs.2012.2195491

Abstract (EN): This paper considers the information theoretic secrecy rates that are achievable by an orthogonal frequency-division multiplexing (OFDM) transmitter/receiver pair in the presence of an eavesdropper that might either use an OFDM structure or choose a more complex receiver architecture. The analysis is made possible by modeling the system as a particular instance of a high dimensional multiple-input multiple-output wiretap channel. The secrecy capacity is formulated as a maximization problem under a trace constraint, and simple expressions are given for its high signal-to-noise (SNR) limit. The low rate limit of the secrecy outage probability is also evaluated under a fading channel model. As for the finite SNR case, the secrecy rates that can be achieved with particular inputs are considered. Numerical results are provided under a Rayleigh fading channel model and under dependence of the main and eavesdropper channels. The secrecy loss due to the OFDM structure constraints, and the information gain for an eavesdropper that uses amore complex receiver, are also considered.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14