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UDC 621.396

MULTI-CRITERIA SYNTHESIS PROCEDURE OF DSSS SIGNALS FOR COGNITIVE RADIO SYSTEMS ADAPTATION TO COMPLEX INTERFERENCE ENVIRONMENT

A. A. Lisnichuk, Ph.D. (Tech.), associate professor, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.

DSSS radio signals under AWGN action realize relatively high noise immunity, however, in the conditions
of complex, dynamically changing interference environment, signals with fixed parameters do not provide
the required characteristics. The aim is to develop multi-criteria synthesis procedure of DSSS signals
for cognitive radio systems adaptation to complex interference situation. The article shows that the minimization
of complex interference effect is recommended to be made by multi-criteria synthesis of elementary
pulses set as well as code sequences ensemble. This fact makes it possible to increase interference immunity
up to 10 dB (in comparison with QPSK signal with spreading of complemented M-sequences ensemble)
in complex signal-interference environment while maintaining BER at QPSK signal level for only AWGN
action.

Key words: radio signal synthesis, cognitive radio system, multi-criteria optimization, increase of noise
immunity.

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