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Article-10 3-2019

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ITERACTIVE ALGORITHM FOR ADJUSTING PARAMETER OF THE SCHEME IN THE DECOMPOSED RADIO CIRCUIT

Andrey V. Sklyar,  Southern Federal University» (SFU), Taganrog, Russia, sklyar.andrey@mail.ru

Abstract
The subject of the researching is a radio system, divided (or decomposed) into several fragments using «matching devices» between them which called «coupling interface» (another names are coupling scheme and coupling quadripole). Some fragments of the decomposed system can be presented in hardware, and others fragments can be presented in software. This method is called HIL-simulation and it allows us to identify disadvantages of the radio system in the early stages of its design. The main problem in system decomposition is the correct adjustment of the stabilizing parameters in a coupling interface. Their correct adjustment allows to achieve convergence of the parameters (such as simultaneous voltage between nodes or current in branche if radio system is considered as a radio circuit) of the decomposed system to according parameters of the initial system in fewer «time steps» (in this paper it is called «iterations»). The adjustment of the stabilizing parameters can be performed in two ways: using the Schur complement before simulation starting of the decomposed radio circuit or using the iterative adjustment algorithm of the stabilizing parameters (IAASP) during the simulation. Unfortunately, in a system, which decomposed into two parts, the adjustment of both stabilizing parameters is not always realizable in practice. The purpose of this paper is to prove that for matching fragments of a decomposed (into two parts) system, it is sufficient to correctly adjust only one of the two stabilizing parameters according to the IAASP. For clarity, the simplest radio system (radio circuit), which consisting of current sources and conductivities, acts as a simple example. Two stabilizing elements are presented as conductances in this case, but only one of them will adjust correctly. On the basis of the obtained results, conclusions were drawn about the admissibility of the practical application of such method in HIL-simulation of radio systems.

Keywords: HIL-simulation, iterative algorithm, radio circuit, decomposition, coupling scheme, stabilizing  parameter, coupling quadripole, Schur complement, electric equilibrium equations, node-voltage analysis, Y-parameters.

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Information about author:
Andrey V. Sklyar, Postgraduate student of «Southern Federal University» (SFU), Taganrog, Russia