Abstract. Covert noise communication system
using spread spectrum technique is proposed. Wireless noise communications are
characterised by informative safety of data transmission. An exact copy of coherent
noise reference is required for optimal signal processing in correlation
receiver. The reconstruction of coherent noise reference with frequency
bandwidth over 1000 MHz is currently impossible using local generator disposed
in a receiver. Communication systems apply the transmitted reference (TR)
techniques for a data transmission with unknown properties of wideband noise carriers or
propagation channels. Ultra-wideband (UWB) noise communication systems based on
the code spectral modulation accomplish the time delay diversity between of noise reference and
informative noise signals delayed at difference time intervals according to
binary data transmission. TR techniques allow to significantly simplifying receiver
structure as well as the whole transmission lines. In this case, the phase exact
synchronization between of noise reference and informational signals at relative transmission
is also not needed. The receiver synchronization is performed with lower requirements
according to fed bit stream. Informative safety of wireless data transmission
is achieved when the time delays of informative noise waveforms significantly
exceed its coherent interval. The time convolution of received continuous noise waveforms
during every informative symbol is produced using the two-channel correlation
receiver. The time delay of each correlation channel corresponds to the time
delay diversity of informative noise signal. The estimation problem, which arises
from varying informative noise signals in a bit stream, potentially degrades
the performance of noise communication system. Correlation estimations are
statistical evaluated for data transmission accomplished throw additive
Gaussian white noise channel. Intersystem jamming is excited in two channel
correlator-based systems even if message data are transmitted over a wireless
channel without thermal noise. This paper proposes the intersystem jamming
reduction when the necessary requirements are satisfied, namely informative
time delays and its difference are significantly exceed the coherent interval
of UWB noise carriers.
Key words: wireless noise communications, spread spectrum, covert transmission, correlation
signal processing, statistical estimation, intersystem jamming.
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