UDC 621.391,
621.396
Correlation estimation for digital communications
using transmitted
reference technique with wideband random noise waveforms
V.
I. Kalinin
Fryasino branch of
Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of
Sciences, Vvedensky Sq., 1, Fryazino, Moscow region, 141190 Russia
The paper is received on April 11, 2019
Abstract. Ultra wideband (UWB) noise communication system using spread spectrum technique is proposed
for a covert data transmission through additive white Gaussian noise (AGWN) channel. Wireless communication systems apply the transmitted reference
(TR) techniques for a
covert data transmission on the base of UWB noise waveforms. Coherent noise reference,
required for optimal signal processing in correlation receiver, is transmitted
through wireless channel simultaneously with informative noise waveforms
modulated by data symbols. Proposed communication system, using the time diversity of the noise reference, accomplishes the relative time delay of informative noise carriers at different time
intervals T1 or T0. Noise signals with the time delay
T1 are modulated by antipodal
informative symbols bl=±1 according to data stream. Noise signals delayed at
the time Ò0 are modulated by conjugate
binary symbols bl-=-+1. The spectral interference in result of the linear
superposition is occurred between the noise reference and delayed informative noise signals in TR transmitter. Spectral power density
of result noise signals is modulated by three harmonic functions with the
periods in inverse proportion to relative time delays: T1; T0; (T1 - T0). The time convolution of received
continuous noise waveforms during every informative symbol is produced using the two-channel correlation
receiver. The time delay in each receiver correlation channel corresponds to
the diversity time delay T1
or T0 of informative noise
signals. The correlation estimation
problem arises when data transmitting is produced utilizing continuous noise
waveforms. The potentially performances of communication systems normally degrade,
if the energy of informative noise carriers randomly varies in the digital data
stream. Correlation estimations are statistical evaluated for data transmission
throw AGWN channel. Intersystem jamming is excited at the output of two channel
correlation receiver even if message data are transmitted over a wireless
channel without thermal noise. This paper proposes the method of intersystem
jamming reduction when the necessary requirements are satisfied, namely
informative time delays (T1,
T0), its difference (T1 - T0) and next expressions (T1 - 2T0); (T0 - 2T1) significantly exceed the coherent interval of UWB noise
carriers. Exclusion principles to utilize closely spaced and two multiple
informative time delays in the process of the spectrum modulation are
considered.
Key words: wireless noise communications, spread spectrum, statistic evaluation,
spectrum modulation, correlation signal processing, signal delay.
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