Synchronization for wireless multi-radar covert communication networks

Shrawan C. Surender, Ram M. Narayanan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations


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.

Original languageEnglish (US)
Title of host publicationDefense Transformation and Net-Centric Systems 2007
StatePublished - 2007
EventDefense Transformation and Net-Centric Systems 2007 - Orlando, FL, United States
Duration: Apr 9 2007Apr 12 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherDefense Transformation and Net-Centric Systems 2007
Country/TerritoryUnited States
CityOrlando, FL

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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