Abstract.
An
algorithm for intermittent communication in channels with lognormal fading is
proposed, which reduces the probability of erroneous reception. It is
established that the use of intermittent communication reduces the probability
of erroneous reception of signals. The gain in noise immunity increases with
the dispersion of the communication channel and the average value of the
signal-to-noise ratio. The algorithm effectively operates in the time duplex
mode, when the envelopes of the signals of both directions are correlated. By
the level of the received signals, the relative level of signals at the
opposite end of the radio link is calculated and due to this, it is possible to
determine the moments of switching on and off of its transmitter.
Data is only transmitted when the signal
levels are higher than the specified threshold level at the receiver input. It
has been established that if this level is chosen to be a multiple of the mean
value, then the radio link utilization factor and data rate are fixed, while
they depend only on the variance of lognormal fluctuations. Varying the
threshold level, you can implement at least two-criteria optimization of data
transfer. Increasing the threshold level increases the noise immunity of the
transmission, but reduces the speed and vice versa. It is established that the
gain from the application of the intermittent communication algorithm increases
with the increase in the dispersion and the signal level. The intermittent
communication algorithm will be reliable for any probability density of the signal
envelope fluctuations, for example in millimeter-wave if dispersion more than
unit, then probably density is not lognormal. In this case, the histogram of
the probability density, then the variance, the mean value and the mean square
are determined and a decision is made to select the threshold level according
criteria the error probability and the data rate.
Key words:
millimeter
waves, telecommunication systems, communication systems, wireless Internet, an
anti-noise signal.
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