Abstract
We have examined technologies for building 5 G mobile networks, which should provide for the creation of ultradense networks in order to render high-quality services. A formalized statement of the problem on synthesis of the optimal signal based on conditions for relative invariance to an additive interference has been prepared. A method for the optimization of signal parameters based on a mean square criterion has been developed. We have proposed to solve the optimization problem by applying the nonlinear programming methods. It has been shown that solving this problem makes it possible to find a signal with the predefined parameters, invariant to deterministic interferences.We have developed a method for the optimization of signal parameters based on a uniform criterion. The method is based on determining a totality of signal decomposition coefficients, at which a maximum of the module of an output signal form a demodulator, taken for all values of a random parameter, is minimal. It has been proposed to solve the problem by employing the linear programming methods. Application of this method makes it possible to improve noise immunity in a data transfer system and increase the rate of information transmission along a communication channel.Synthesis of the optimal signal with respect to the additive interference has been performed. A given signal renders the maximum possible noise immunity to the system. We have considered a discrete difference transform that possesses a universal property of invariance relative to a wide class of interference.It has been shown that the achievement of an absolute or a relative invariance and the expediency of applying one of the specified methods depend on the characteristics of an interference, the degree of their a priori certainty, as well as the feasibility to form a reverse communication channel. Simulation results have shown that the methods for the formation of an invariant signal, proposed in this paper, could improve a system noise immunity in the communication channel by 5‒7 dB. Introduction of the devised methods would make it possible to increase the rate of transmitted information by 30 %, provided the assigned reliability of data transfer is ensured. Enabling the invariance of an information transfer system would make it possible to build the ultradense fifth-generation networks
Highlights
In modern networks, increasing attention during information transfer is paid to the construction of information systems, capable of providing for the assigned probability of information transmission at a change in conditions along a communication channel
The aim of this study is to examine a possibility to synthesize an invariant system of information transfer, against a specific class of interferences, which is the most effective 5 G mobile network infrastructure
For those same values for the base, we present the curves of noise immunity for a system with frequency modulation (FM) when using the so-called “broadband reception with integration after detector” [5], calculated from formula: 6/9 ( 96 ) 2018
Summary
In modern networks, increasing attention during information transfer is paid to the construction of information systems, capable of providing for the assigned probability of information transmission at a change in conditions along a communication channel. These conditions are typically caused by various influences and interferences. An important prerequisite is to provide for the assigned reliability of information transfer despite changes in the conditions along a communication channel, caused by various influences and interferences That is, such systems must possess the property of invariance to different interferences
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