Secure Transmission in OFDM Systems by Using Time Domain Scrambling

Author

Hao Li ; Xianbin Wang ; Weikun Hou

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Western Ontario, London, ON, Canada

fYear

2013

fDate

2-5 June 2013

Firstpage

1

Lastpage

5

Abstract

In order to improve the confidentiality and security of orthogonal frequency division multiplexing (OFDM) systems, a physical layer security enhancement scheme by using time domain scrambling techniques is proposed in this paper. The approach is based on secretly scrambling the sample sequence within each time domain OFDM symbol, which is equivalent to constellation transformation over each subcarrier in the frequency domain. Consequently, the unique signal characteristics of the standardized OFDM transmission can be removed. The efficacy of the security enhancement is analyzed by means of the secrecy capacity. Moreover, related simulation results under the AWGN and the Rayleigh channel models indicate that our proposed scheme can improve the system secrecy significantly and the corresponding system performance will not be degraded.

Keywords

AWGN channels; OFDM modulation; Rayleigh channels; telecommunication security; time-domain analysis; AWGN channel model; OFDM systems; Rayleigh channel model; orthogonal frequency division multiplexing system; physical layer security enhancement scheme; time domain scrambling techniques; Bit error rate; Constellation diagram; Frequency-domain analysis; OFDM; Receivers; Security; Time-domain analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference (VTC Spring), 2013 IEEE 77th

Conference_Location

Dresden

ISSN

1550-2252

Type

conf

DOI

10.1109/VTCSpring.2013.6692745

Filename

6692745