Technical Program

Paper Detail

Session:Cryptography and Watermarking; Manufacturing Applications
Time:Friday, May 21, 13:00 - 15:00
Presentation: Poster
Topic: Industry Technology Track: DSP-Based Cryptography, Stenography, and Watermarking
Authors: John Kleider; General Dynamics Decision Systems 
 Steve Gifford; General Dynamics Decision Systems 
 Scott Chuprun; General Dynamics Decision Systems 
 Bruce Fette; General Dynamics Decision Systems 
Abstract: Digital watermarking typically allows embedded signals to be separated from audio and video signals for purposes such as copyright protection, distribution tracing, authentication, and authorized access control. In this work we apply watermarking to the physical layer of the wireless baseband modulation waveform, with the motivation to improve flexibility and efficiency of authentication processes in a secure wireless network. We present two baseband watermarking methods called constellation dithering (CD) and baud dithering (BD) applied to Orthogonal Frequency Division Multiplexing (OFDM). We provide the watermark detection and capacity performance attributes in an additive white Gaussian noise (AWGN) channel. Both watermarking techniques allow interoperability with uninformed systems (such as receivers in the 802.11 WLAN commercial standard). Results indicate that, while the BD method provides higher detection robustness and capacity, the CD method exhibits more performance flexibility and is easily modified to the desired user characteristics.

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