SCIENTIFIC AND TECHNICAL JOURNAL «RADIO COMMUNICATION THEORY AND EQUIPMENT» ISSUE 4, 2008

**SUBOPTIMAL MULTIALTERNATIVE SEQUENTIAL DISTINCTION WITHOUT MEMORY BASED ON COMPARISON OF TWO EXTREMAL STATISTICS**

*V.M. ZINCHUK, YU.N. MAKSYUTA*

Suboptimal sequential algorithm for distinguishing random number (M ? 2) of signals based on forming M-sufficient statistics from the observed realizations, selecting among them the maximum one and the second one and their comparison is discussed. Numerical calculation results are given for the case of non-coherent processing of non-fading and fading signals in the adaptive Gaussian noise channel.

**METHODOLOGICAL FUNDAMENTALS FOR MULTICRITERIA APPROACH TO COMMUNICATION SYSTEM DEVELOPMENT**

*A.V. GARMONOV, I.I. FEFILOV, P.L. SAVINSKY, G.A. KASHCHENKO*

Methodological fundamentals for multi criterion approach to radio-communication system development are discussed. It is shown that in the case of multi criterion problem definitio the communication system design problem is more adequate to the real design problem.

**DEFINITION OF THE FUZZY SET MEMBERSHIP FUNCTION FOR ANALYZING WIRELESS NETWORK RISKS**

*V.I. BORISOV, V.B. SHCHERBAKOV, S.À. YERMAKOV*

The purpose of the work consists in elaborating the expert methodology to define fuzzy set membership functions for posterior wireless network risks analysis based on applying the apparatus of fuzzy sets and Mamdani fuzzy derivation algorithm.

**EFFICIENT ANALYSIS FOR CYCLIC PROCEDURES OF SIGNAL SEARCHING WITH PARAMETERS RANDOMLY CHANGING IN TIME**

*V.M. ZINCHUK, A.E. LIMAREV, L.V. GRIDNEVA, M.V. SMAGINA*

The efficiency of cyclic procedures with alternate prior uncertainty domain survey for the case when detected signal parameters are changed as discrete non-homogeneous in time Markovian process with discrete finite number of states is examined.

**DECREASING TRANSITIVE PROCESS TIME IN FREQUENCY SYNTHESIZERS BY PLL-SYSTEM OPERATING MODE LINEARIZATION METHOD**

*S.K. ROMANOV*

Analytical expressions to determine the transitive processes duration while tuning the synthesizer and decreasing slip-time units frequency are found. The comparison of calculation results on these expressions and transitive process modelling results in the synthesizer on the base of third – five order IPLL using the SIMULINK visual modelling system of MatLab mathematical estimations is conducted.

**RESEARCH OF APPROXIMATION FOR PROBABILITIES OF THE RIGHT DECISION MAKING ACCURACY ON THE BASE OF JEFFRIES-COULBACK DIVERGENCE**

*P.V. POVETKO*

The accuracy of probabilities approximation for evaluating the right-decision probabilities in the general case and in the special case which have not been discussed in the current research works including the case when probability distribution laws for the object feature or process states values are unknown is examined.

**WAYS TO INCREASE LASER ATMOSPHERIC COMMUNICATION LINES BY DECREASING THE TOTAL SCATTERING CROSS-SECTION**

*S.V. ARTYSHCHENKO*

The way to increase the LACL efficiency by means of coherent environment preparation in the laser pulse propagation channel basing on the total molecule scattering cross-section decrease is offered. According to our estimation, as a result of optical molecule alignment in the plane perpendicular to the information pulse plane, the total scattering cross-section on the molecules decreases as much as two-to-three times.

**SOME SYSTEM ASPECTS OF RADIO ELECTRONIC COMMUNICATION AND JAMMING MEANS AND SYSTEMS JOINT OPERATION**

*A.V. BUBENSHCHIKOV, M.E. ZHILINA, V.N. LEDOVSKOY, V.P. PUSTOVIT*

The evaluation of the possibilities to provide the opposite-party radio communication electronic means and jamming system joint operation in the common frequency bands while realizing dynamic inhibits is discussed using the developed mathematical simulation model. Potential jamming system frequency accessibility while providing its electromagnetic compatibility with radio electronic communication means is determined.

**STRUCTURAL PARAMETRIC SYNTHESIS OF INTERDIGITAL TRANSDUCER WEIGHTED BY MEANS OF SELECTIVE ELECTRODE REMOVAL**

*YA.E. LVOVICH, G.A. KASHCHENKO, O.V. NIKOLAYEV, A.L. KUZEVANOV, R.V. SEMYONOV*

Mathematical formalization of interdigital transducers weighted by means of selective electrode removal structure-parametric synthesis problem is realized. The methodology for this problem solving is elaborated.

**COMPUTER METHODOLOGY APPLICATION IN ELECTROMAGNETIC ENVIRONMENT EVALUATION FOR STATISTICAL CHARACTERISTIC ANALYSIS**

*A.D. KOROBOVA, E.A. KHROMYKH*

Questions concerned with introducing of electromagnetic environment into the computer model in the radio electronic means grouping parameters changing by the random law are examined.

**CRITICAL ANGLES FOR SCANNING THE FLAT ANTENNA ARRAY COMPOSED OF LOGOPERIODIC PRINTED RADIATING ELEMENTS**

*A.M. BOBRESHOV, E.A. RUDNEV, V.S. CHALYKH, S.N. SHULZHENKO*

Critical scanning angle for the plane phased antenna array is determined. The discussed type of antenna elements that compose the phased antenna array allows realizing the robust scanning of the formed antenna pattern in the operating frequency range with the octive overlapping.

**MATHEMATICAL MODEL FOR NAVIGATION SET OF SATTELITE RADIO NAVIGATION SYSTEMS FUNCTIONING EVALUATION**

*A.V. KOROVIN, R.P. KOKHANOV, V.A. MIRONOV, V.V. NEROVNY*

A mathematical model for defining the accuracy of on-board navigation system characteristics where the consumer satellite radio navigation system equipment with information redundancy is used, which allows to improve the accuracy characteristics of on-board navigation system 1,6 times.