TY - GEN
T1 - Synchronization for wireless multi-radar covert communication networks
AU - Surender, Shrawan C.
AU - Narayanan, Ram M.
PY - 2007
Y1 - 2007
N2 - The motivation for our current work is the need for a covert wireless communication network between multi-site radars. Such radars form an effective network-centric architecture that has intrinsic properties such as LPI, LPD, and good data dissemination capabilities. Our continuing work indicates that a notched UWB noise signal within which OFDM data symbols are embedded can be used as a secure communication channel between individual noise radars. The receiver performance in such systems depends heavily on the timing of the DFT window for detecting the message symbols concealed within the noise-OFDM waveform. Performance is therefore severely limited due to the effects of timing and frequency offsets on the noise-data signal. These synchronization errors bring unwanted noise into this window in the form of ICI, ISI, etc. In this paper, we show that most of the techniques developed for a simple OFDM system do not suit the covert noise-OFDM system requirements. We further propose a packet/frame detection and timing estimation technique for the noise-data signal used between the random noise radars. This technique is unique as it is applied to OFDM symbols embedded in UWB noise. With no preprocessing required in the transmitter and no knowledge about the source noise signal, the correlation properties of band-limited white noise are exploited to achieve synchronization.
AB - The motivation for our current work is the need for a covert wireless communication network between multi-site radars. Such radars form an effective network-centric architecture that has intrinsic properties such as LPI, LPD, and good data dissemination capabilities. Our continuing work indicates that a notched UWB noise signal within which OFDM data symbols are embedded can be used as a secure communication channel between individual noise radars. The receiver performance in such systems depends heavily on the timing of the DFT window for detecting the message symbols concealed within the noise-OFDM waveform. Performance is therefore severely limited due to the effects of timing and frequency offsets on the noise-data signal. These synchronization errors bring unwanted noise into this window in the form of ICI, ISI, etc. In this paper, we show that most of the techniques developed for a simple OFDM system do not suit the covert noise-OFDM system requirements. We further propose a packet/frame detection and timing estimation technique for the noise-data signal used between the random noise radars. This technique is unique as it is applied to OFDM symbols embedded in UWB noise. With no preprocessing required in the transmitter and no knowledge about the source noise signal, the correlation properties of band-limited white noise are exploited to achieve synchronization.
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UR - http://www.scopus.com/inward/citedby.url?scp=36048975390&partnerID=8YFLogxK
U2 - 10.1117/12.720220
DO - 10.1117/12.720220
M3 - Conference contribution
AN - SCOPUS:36048975390
SN - 0819467006
SN - 9780819467003
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Defense Transformation and Net-Centric Systems 2007
T2 - Defense Transformation and Net-Centric Systems 2007
Y2 - 9 April 2007 through 12 April 2007
ER -