The practical realization of potential opportunities of onboard radio local systems of radio local systems (OBRLS) that are currently considerably higher than their real approachable technical characteristics is one of the main tasks of modern theory and practice of electronic and telecommunication. The authors of the article proposed some specific technical offers and ways of physical realization of scientifically grounded algorithm of adaptive compensation of non linear distortions (ACNLD). The insertion of artificial main and supportive entrances into the scheme of non-linear adaptive compensators allowed using the general theory of adaptive systems for their synthesis. The practical usage of synthesized following such a principle ACNLD according to the created recommendations allows to significantly increase the indices of quality of OBRLS in the real conditions of their functioning, comparing with the already known ones. An additional advantage of proposed adaptive method of expansion of linear dynamic diapason (LDD) is an improvement of all-weather of OBRLS and increasing of probability of identification of radio local maps of locality captured in different weather conditions without any additional changeovers. Except for this, a flexible reserve for the noise immunity of OBRLS is being fulfilled that allows taking into consideration the possible improvements of means of radio electronic struggle. Synthesized ACNLD are considerably free from many drawbacks of linear determined means of expansion of dynamic diapason of radio receiving devices (RRD) and also they have simpler apparatus realization. Except, in a process of projection of ACNLD a considerably less volume of a priori information about the parameters of LDD is needed for the calculation of already known schemes of depression of non-linear distortions. The transferring functions of adaptive filters of ACNLD are quite quickly gather at the non-linear transferring function of radio device (RD) provided that an effective convergence can be seen only with the presence of the inner noises at least unless they exceed the non-linear distortions by the level.K e ywor d s : radio device, adaptive compensator, non-linear distortion, internal noises, amplitude characteristic, dynamic diapason.
As part of the article the scientifically grounded synthesis of the algorithm of adaptive compensation of nonlinear distortion (ACNLD) of radio devices based on the use of the mathematical apparatus of a theory of nonlinear analysis (Voltaire series). Actual speed and accuracy of adaptation were determined by choosing the optimal value of transmission coefficient. Some actual causes of limitation of dynamic range and appearance of internal noises of radio equipment were established. The estimation of ACNLD noise influence on its efficiency was carried out, and also the influence of signal component of the reference input ACNLD on radio quality indicators
An approach to determining the bandwidth of the self-healing segment of the data network is proposed. The subject of the study are autonomous segments of the telecommunications network, which have the property of self-healing. The object of research is the process of information transfer between nodes of an autonomous segment. The scientific novelty is to improve the method of determining the capacity of the self-healing segment of the telecommunications network with limited network resources by applying the criterion of ensuring the minimum time of information delivery at a given limit of possible probability of loss. The following tasks were solved: a mathematical model of the self-healing segment of the telecommunication network in the form of a queuing system was developed; the proposed method of calculating the degree of channel congestion. Conclusion: the proposed approach made it possible to calculate the bandwidth of the communication channels of the self-healing segment of the telecommunications network and the required amount of buffer memory with a known network topology and a given gravity matrix, providing the required values of failure probability and guarantee minimum message delivery time.
This paper considers a fundamentally new model of data network construction for servicing the flows given by the gravitational matrix with restrictions on the time of information transmission. The proposed network model differs from the known ones because it has an expanded capacity of node and channel resources, combining the lowest possible cost of channels and switching nodes. As part of the development of the proposed model and algorithm for allocation of flows in a full mesh network, the developed mathematical apparatus provides a high degree of reliability and survivability of the synthesized network as a whole. One of the used approaches to the solution of the linear programming problem is based on the choice of the target function, the type of which is determined by the consumer conditions of the synthesis of a particular data network. Within the framework of the article, it is established that the linear programming problem, for each specific case, has an admissible, practically realizable solution with the optimal choice of the target function without additional simplex transformations. An important obtained result of the research is the simplicity of flow control, which is in direct dependence on the strict ordering of the proposed structure, because it was possible to connect by analytical dependences the flows in the branches and the path data transfer flows. The obtained analytical results can be used as a basis for statistical algorithms of information flow control.
Показано, що для підвищення достовірності передавання інформації у безпроводових телекомунікаційних системах широко застосовуються згорткові коди спільно з різноманітними методами декодування. Наведено загальні принципи синтезу та параметри алгебраїчних несистематичних згорткових кодів з довільною швидкістю кодування та максимально досяжною кодовою відстанню. Представлено основні етапи біоінспірованого методу декодування алгебраїчних згорткових кодів з використанням механізму випадкового зміщення. Показано, що сутність представленого методу декодування полягає у застосуванні процедури диференційної еволюції з евристично визначеними параметрами. Також у даному методі використовується інформація про надійність прийнятих символів для знаходження найбільш надійного базису узагальненої породжувальної матриці. Додатково застосовується механізм випадкового зміщення для модифікації прийнятої послідовності з метою здійснення біоінспірованого пошуку на основі різних найбільш надійних базисів узагальненої породжувальної матриці. За результатами досліджень визначено, що біоінспірований метод декодування алгебраїчних згорткових кодів забезпечує більшу ефективність у порівнянні з алгебраїчним методом декодування у каналі зв'язку з адитивним білим гауссовим шумом. В залежності від параметрів алгебраїчного згорткового коду та необхідного коефіцієнту помилок енергетичний виграш від кодування становить від 1,6 дБ до 3 дБ. Показано, що представлений біоінспірований метод декодування може бути використаний для згорткових кодів з великою довжиною кодового обмеження. При цьому представлений метод декодування алгебраїчних згорткових кодів програє за ефективністю методу декодування Вітербі та турбокодам при достатній кількості ітерацій декодуванняКлючові слова: безпроводові телекомунікаційні системи, згорткові коди, алгебраїчна структура, декодування, біоінспірований пошук UDC 621.391
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