English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In contrast to other spread-spectrum techniques, wideband pulse trains withrelatively low pulse arrival rates may be considered unsuitable for covertcommunications. The high crest factor of such trains can be extremelyburdensome for the transmitter hardware, and it makes the pulse trains easilydetectable even at very low signal-to-noise ratios. In addition, it may appearthat sharing the wideband channel by multiple users would require explicitallocation of the pulse arrival times for each sub-channel, which would beimpractical in most cases. On the other hand, messaging by wideband pulsetrains has many appealing features. Among those are the ease of synchronous aswell as asynchronous pulse detection, and on-the-fly channel reconfigurability(e.g. changing the spreading factor). Favorably, the crest factor of a pulsetrain, as well as its apparent temporal and amplitude structure, can be easily,and reversibly, controlled by simple linear filtering. For example, atransmitted pulse train can be made statistically indistinguishable from theGaussian component of the channel noise (e.g. the thermal noise) observed inthe same spectral band, while the received signal will be the designedhigh-crest-factor wideband pulse train. In this paper, we utilize the so-calledpulse pileup effect to perform such reversible control of the pulse trainstructure, enabling a wider use of this approach for synthesis of robustlow-SNR covert communication links. We place a particular focus on thesynchronous pulse detection in the receiver, that provides a better utilizationof the channel spectrum.

Utilizing Pulse Pileup Effect in Development of Robust Low-SNR Covert Communication Links