Device and method for acquiring and optimizing DTMB (digital terrestrial television multimedia broadcasting) single frequency network coverage rate

Abstract

The invention provides a device and a method for acquiring and optimizing the DTMB (digital terrestrial television multimedia broadcasting) single frequency network coverage rate, which is used for network planning and optimizing a terrestrial digital television single frequency network. The device comprises a station information processing module, a station database, a radio wave propagation budgeting module, an interference analyzing module, a calculation module, an optimization module, a GIS module, a geographic information database and a coverage result database. According to the invention, a synchronization threshold is defined so as to reflect the gain of the single frequency network, the active power and the interference power of a receiving plate are combined by adopting a K-LNM method, a correlation index of the combined active power and the combined interference power is solved by using a method of matching correlated matrixes, prediction of the place probability covering a community is enabled to consider the correlation caused by self-interferences and shadow fading of the single frequency network, and the place probability of a grid is calculated by using a CCDF function. The device and the method provided by the invention is more practical and more accurate in budgeting result, and small in calculation amount, enables the self-interferences of the single frequency network to be the smallest under the condition of not changing other parameters of a transmitter, and does not need to increase the cost.

Description

technical field [0001] The invention relates to a method and device for acquiring and optimizing the coverage of a DTMB (Digital Terrestrial Television Multimedia Broadcasting) single frequency network, belonging to the technical field of terrestrial digital television single frequency network planning and optimization. Background technique [0002] Due to its many advantages, single frequency network has become the main deployment form of terrestrial digital TV coverage network. All transmitters in single frequency network use the same frequency to transmit the same signal at the same time. In addition to natural multipath, the single frequency network itself produces "artificial multipath". OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) makes the single frequency network possible. The size of the guard interval in OFDM determines the single frequency network The maximum distance between transmitters, when the distance between ...

AI Technical Summary

Problems solved by technology

[0005] In August 2006, my country promulgated the terrestrial digital TV multimedia broadcasting standard DTMB with China's independent intellectual property rights. International commercial and professional terrestrial digital broadcasting signal coverage prediction software does not support my country's DTMB standard, and these commercial software interfaces are encrypted and fixed. , Expensive to buy and upgrade

Both genetic algorithm (GA, genetic algorithm) and PSO algorithm are bionic algorithms, but PSO is mainly used in continuous problems. Once the particles are too concentrated, they may fall into local minimum

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