Authors G. A. Stetsenko, L. G. Statsenko, A. F. Lomakin
Month, Year 06, 2018 @en
Index UDC 621.396.6:621.397
Abstract The article analyzes the results of simulation the occurrence of intra-system interference on a co-channel in a single-frequency DVB-T2 network in the Primorskiy Krai. The situation is described when the quality of network broadcasting for a region with a complex terrain, built on the basis of a previously deployed infrastructure, significantly depends on the selected value of the guard interval. Since the network configuration under study is unique, the used DVB-T2 broadcasting modes, effective antenna heights and effective transmitter power can determine not only the size of the service area, but also lead to intra-symbol interference areas with reduced signal quality inside the service area. This assumption is confirmed by the results of numerical modeling to identify areas with a critical level of interference in the service area of a television transmitter in the city of Ussuriysk when the central transmitter of the network located in Vladivostok is operating. The Longly-Rice model is used, the parameters of which take into account the current network broadcasting modes and the provisions of the Russian GOST on digital television. When analyzing the results of numerical simulation, several areas with a critical level of interference in the service area of the DVB-T2 network were identified. The reason of it is non-fulfillment of the conditions for the correct operation of the transmitters of a single-frequency network in an area with difficult terrain. With the established network operating modes, the signal lag from the central network transmitter in Vladivostok can create the effects of intranet interference in remote service areas. The revealed feature is confirmed by the data of field measurements of the quality of the television signal in problem areas, carried out in accordance with existing standards and requirements. Some options are offered to reduce the effect of interference. So, for the example in question, possible ways to eliminate the effects of intranet interference can be either reducing the power of the interfering central television transmitter of the network, or changing the main network parameter — the guard interval — to 1/4 of the useful symbol. At the same time, while maintaining the existing spatial separation of the RCF and antenna patterns of antenna systems, optimization of the preset relative delay for each network transmitter can be an effective method of eliminating the mutual influence of transmitters.

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Keywords Intra-system interference; DVB-T2 SFN; model calculation; signal quality measurement.
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