I.G. Babanin – Senior Lecturer, 

Department of space instrumentation and communication systems, South-West State University (Kursk) E-mail: babanin_ivan@bk.ru

N.Y. Mikhailova – Student, 

Department of space instrumentation and communication systems, South-West State University (Kursk) E-mail: mikhailova.natalia.u@gmail.com

A.I. Nikolaenko – Student, 

Department of space instrumentation and communication systems, South-West State University (Kursk) E-mail: NikolaenkoAI@yandex.ru

D.S. Koptev – Post-graduate Student, 

Department of space instrumentation and communication systems, South-West State University (Kursk) E-mail: d.s.koptev@mail.ru

Timely information transfer is a basis of stable functioning of modern society. For exchange of large volumes of information the highspeed telecommunication systems providing uninterrupted connection are used. About 30% of traffic are transferred by means of communication fiber lines. Transfer of the most part of traffic is provided digital radio relay, satellite, mobile and VHF with radio transmission lines of information [2, 3, 4].

Effect of increase in transmission rate and the number of subscribers is deficit of a frequency resource. The exception of cross impact of a signal on signals of other subscribers of the same network and on signals of other communication systems requires restriction of ranges of signals from each subscriber transmitter. Due to continuous growth of requirements to transmission rate there is a need for suppression of side spectrum components of a signal of the transmitter and to increase in its spectral efficiency. But use of radio systems with high rates of spectral efficiency leads to low indicators of power efficiency because of nonlinearity of paths, the distortions entered by the environment of distribution of a signal, parameters of systems of synchronization of the receiver.

In mobile radio information transmission systems the following types of manipulations are used: quadrature and amplitude with a pozitsionnost 64 (KAM-64), KAM-128, in communication radio relay systems – KAM-512, KAM-1024. The arrangement of signal points in phase and amplitude space at the KAM different types is defined by signal constellations of modulated signals. Are practically used both normal uniform, and uneven signal constellations with different distances between two next points of the constellation in adjacent quadrants that is quantitatively evaluated by coefficient of irregularity of the signal constellation (ꭓ). Use of uneven structure of signal constellations provides improvement of decoding of a data stream, however at the same time increase in a signal-to-noise ratio for a data stream as noise and noises transform signal points of the constellation to «clouds» is required. The cloud’s center is the signal point, and its «blurring» characterizes the residual carrier level. At very strong noise to distinguish signal points in quadrants becomes almost impossible. However thanks to the entered irregularity to signal constellations decoding is carried out with an admissible error probability. Development of complexes with higher exchange rates of data is extremely difficult in connection with more pronounced losses of not noise nature caused by not ideality of an amplitude-frequency characteristic of the coordinated filter of a radio receiver. At the same time the coordinated filtering remains to the best among other ways of filtering in connection with the maximum signal-to-noise ratio today. In article need of a research of influence of not ideality of parameters of the optimum demodulating device at signal pick-up with the quadratural amplitude modulation (QAM) of a different pozitsionnost and irregularity of the signal constellation is considered. The equations defining the power balance of the radio line and total losses arising in a path are described. Mathematical expressions according to the equivalent power losses caused by irregularity of an amplitude-frequency characteristic of the coordinated filter (CF) are developed. The purpose of article is development of the assessment procedure of not noise losses in the Federation Council providing minimization of these losses at synthesis of radio receivers at high data transmission rates.

Need of a research of influence of not ideality of parameters of the optimum demodulating device at signal pick-up with the quadratural amplitude modulation (QAM) of a different number of points of the constellation diagram and irregularity of the signal constellation is considered. The equations defining the power balance of the radio line and total losses arising in a path are described. Mathematical expressions according to the equivalent power losses caused by irregularity of an amplitude-frequency characteristic of the coordinated filter (CF) are developed. The procedure of definition of losses of not noise character in the Federation Council at creation of high-speed radio information transmission systems is offered.

1. Mukhin I.E., Khmelevskaya A.V., Babanin I.G. Metodologicheskie osnovy sinteza sistem obespecheniya elektromagnitnogo dostupa sredstvami radiomonitoringa sovremennykh sistem telekommunikatsii. Kursk: YuZGU. 2016. 316 s. (in Russian)
2. Dovbnya V.G., Aziattsev V.E., Mikhailov S.N. Pomekhoustoichivost radiopriemnykh sistem tsifrovykh linii svyazi. Kursk: YuZGU. 2017. 175 s. (in Russian)
3. Babanin I.G. Protsedura proektirovaniya filtrov chastotnoi selektsii s uchetom energeticheskikh poter v radiopriemnykh ustroistvakh vysokoskorostnykh radiosistem peredachi informatsii: avtoreferat dis. kand. tekhn. nauk. Kursk: YuZGU. 2018. 19 s. (in Russian)
4. Babanin I.G. Protsedura proektirovaniya filtrov chastotnoi selektsii s uchetom energeticheskikh poter v radiopriemnykh ustroistvakh vysokoskorostnykh radiosistem peredachi informatsii: dis. kand. tekhn. nauk: 05.12.04. Kursk: YuZGU. 2018. 166 s. (in Russian)
5. Fukuda E., Takeda Y., Daido Y., Sasaki S., Nakamura H. Design of 64 QAM modem for high-capacity digital radio systems. GLOBECOM83 Conf. Rec. San Diego. November-December 1983. V. 2.
6. Lezin Yu.S. Optimalnye filtry i nakopiteli impulsnykh signalov. M.: Sov. radio. 1963. 320 s. (in Russian)
7. Mukhin I.E., Babanin I.G. Opredelenie ekvivalentnykh energeticheskikh poter polosovykh filtrov, vyzvannykh neravnomernostyu fazochastotnoi kharakteristiki, pri prieme signalov s kvadraturnoi amplitudnoi modulyatsiei. Izvestiya YuZGU. Ser. Upravlenie, vychislitelnaya tekhnika, informatika. Meditsinskoe priborostroenie (Kursk: YuZGU). 2012. № 2−3. S. 129−133. (in Russian)
8. Babanin I.G., Mukhin I.E. Sravnitelnyi analiz shumovykh i neshumovykh energeticheskikh poter v filtrakh sistem telekommunikatsii //Materialy V regionalnoi nauchno-praktich. konf. «Aktualnye problemy infotelekommunikatsii». Kursk: YuZGU. 2013. S. 187−192. (in Russian)
9. Mukhin I.E., Babanin I.G. Raschet energeticheskikh poter v polosovykh filtrakh pri prieme signalov s kvadraturnoi amplitudnoi modulyatsiei. Telekommunikatsii (Kursk: YuZGU). 2011. № 8. S. 32−36. (in Russian)
10. Babanin I.G., Koptev D.S. Opredelenie oshibok v prinimaemykh dannykh, vyzvannykh neravnomernostyu amplitudno-chastotnoi kharakteristiki sputnikovogo radiokanala pri optimalnom prieme signalov s FM-2 i FM-4. Sb. nauchnykh statei po materialam III Vseros. nauchno-prakticheskoi konf. «Infokommunikatsii i informatsionnaya bezopasnost: sostoyanie, problemy i puti resheniya». V 2-kh chastyakh. Kursk: YuZGU. 2016. S. 124−136. (in Russian)
11. Babanin I.G., Khotynyuk S.S. Sposob opredeleniya ekvivalentnykh energeticheskikh poter simmetrichnykh filtrov chastotnoi selektsii s konechnoi impulsnoi kharakteristikoi v vysokoskorostnykh radiosistemakh. Izvestiya YuZGU (Kursk: YuZGU). 2013. № 3 (48). S. 70−73. (in Russian)
12. Sevryukov A.E., Osipov N.S. Vliyanie konfiguratsii sistem MIMO na energeticheskie parametry radiolinii. Sb. nauchnykh statei po materialam III Vseros. nauchno-prakticheskoi konf. «Infokommunikatsii i informatsionnaya bezopasnost: sostoyanie, problemy i puti resheniya». V 2-kh chastyakh. Kursk: YuZGU. 2016. S. 105−110. (in Russian)
13. Babanin I.G., Koptev D.S. Obshchaya teoriya svyazi. Signaly i analogovye sistemy peredachi informatsii: Ucheb. posobie. Kursk: YuZGU. 2018. 110 s. (in Russian)