Method of power parameters optimization of communication system in partial radio channels of small-sized mobile objects based on the fuzzy sets theory basis
Problem definition: the organization of communication in radio engineering system sets a task to eliminate a contradiction between increase in volume of information necessary for transfer and its transfer time minimization. This task acquires special relevance in the communication system with high-maneuverable small-sized mobile objects, for example in the robotic complexes functioning in the interference conditions. The organization of parallel spatial radio channels of information transfer which is usually applied in mobile communication system of the last generation can reduce information transfer time. For mobile systems, in which the robotic mobile platform of a robotic complex acts as the base station or a repeater, the problem of optimum transmitter power redistribution for improvement the parallel channels quality acquires special relevance because of the energy resources restriction and the high platform mobility. At the same time the optimal search speed requirements of a distributive task solution increase. New methods of optimum power value definition in a partial radio channel in real time are required. The purpose of the work is the development of transmitter power distribution optimization method in a robotic complex mobile platform at the spatial parallel radio channels organization. In order to solve the problem, it is proposed to use a fuzzy set theory apparatus to construct modified functions, which allow to explore the belonging of each channel power values to target function values. Such target function determines the quality of the entire set of parallel radio channels. The used methods: The solution of optimization problem is performed by the construction of special fuzzy sets belonging functions and fuzzy logical operations execution. The application of fuzzy logical operations on these functions allows to estimate each channel power contribution to the total set. Comparison with known optimization methods is carried out. Novelty of the offered method lies in known accessory functions modification and fuzzy logical operations, and also development of the new algorithm to solve an optimizing task and to obtain the exact decision. Optimum power distribution in spatial parallel radio channels is the result of using the offered method. If characteristics of each partial channel change, optimum power distribution allows to provide and to maintain the required quality during the communication session. Practical importance: the proposed solution can be realized on the fuzzy logic controller basis which is connected to the transmitter intensifying cascade. Also it can be included in the automatic strengthening adjustment scheme. Also the implementation of the proposed solution can be carried out by the programmable logical integrated circuits in the form of the transmitter power management module software.