CALCULATION METHOD

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CALCULATION METHOD

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Methodology to be used for estimating propagation of electromagnetic waves through space. It is necessary to decide which simulation model to use in each case, depending on the environment in which the network is going to be deployed, the technology used, the work frequency bands and the quality of cartographic information available to model the terrain. By creating a new study, Xirio, by default, proposes the most suitable method for the calculation required.

It is possible to create the calculation method from a template or create a new one. In the first case a copy of the selected template is loaded, so that template will not be modified.

The Xirio calculation methodsare based on basic or standards models, usually promoted by International Recommendations, to which it is possible to configure settings for more precise adjustment due to planning circumstances. The parameters to be set in the window corresponding to the calculation method will depend on basic propagation method selected by the user.

The basic propagation methods are:

ITU-R Rec. 526. Deterministic calculation method based on difraction losses. It is valid for frequencies above 30 MHz. Recommended for all radio services in rural and sub-urban environments, where medium or high-resolution cartography is available.

Deygout. Deterministic calculation method based on difraction losses. It is valid for frequencies above 30 MHz. Recommended for all radio services in rural and sub-urban environments, where medium or high-resolution cartography is available.

Line of sight. Calculation method that provides signal level prediction only in clearance conditions, using free space attenuation

ITU-R Rec. 1546. Empirical calculation method in the frequency range from 30 MHz to 1 GHz. It is valid in rural environments for any radio service, and especially recommended for sound and video broadcasting for distances above 100 km or where accurate cartography is not available.

Okumura-Hata. Empirical calculation method valid in the frequency range from 150 MHz to 2 GHz. Recommended for mobile services and broadband access services in rural and urban environments, where high-resolution cartography is not available.

Modulated Okumura-Hata. Hybrid calculation method valid in the frequency range from 150 MHz to 2 GHz. Based on Okumura-Hata method, this model makes a correction for diffraction losses. Recommended when using high-resolution cartography in urban environments.

Xia-Bertoni. Deterministic calculation method valid in the frequency range from 800 MHz to 2 GHz. Recommended for urban environments in mobile services and broadband access services. It requires urban cartography with building information (DBM).

Rec. UIT-R 1411. Deterministic calculation method valid in the frequency range from 800 MHz to 5 GHz. Recommended for urban environments in mobile services and broadband access services. It requires urban cartography with building information (DBM).

COST 231. Deterministic calculation method valid in the frequency range from 800 MHz to 2 GHz. Recommended for urban environments in mobile services and broadband access services. It requires urban cartography with building informatio (DBM).

Stanford University Interim. Empirical calculation method valid for frequencies below 11 GHz. Recommended for mobile services and broadband access services (especially WiMAX) where urban cartography with building information (DBM) is not available.

ITU-R Rec. 1812. Deterministic calculation method valid in the frequency range from 30 MHz to 3 GHz. Used in rural and mixed environments for all radio services, especially broadcasting, where medium or high resolution cartography is available

ITU-R Rec. 452. Deterministic calculation method valid in the frequency range from 700 MHz to 50 GHz. Highly recommended for interferences calculation in fixed service links.

ITU-R Rec. 530. Deterministic calculation method valid for frequencies above 30 MHz. It incorporates the feasibility analysis of digital radio links in fixed services.

Defined by user. Calculation method configurable by user in which is possible to define the basic propagation signal losses using a formula set manually by the user. Under the terms of that formula would be may intervene distance (Km), frequency (MHz), transmitter height (m), receptor height (m), transmitter effective height (m) and diffraction loss (dB).

Surface curves. Surface wave propagation calculation method. Valid for frequencies below 30 MHz. The use of morphographic mapping of soil conductivities is recommended.

Indoor method. Empirical 2.5D calculation method for indoor propagation prediction. Compatible with indoor-outdoor, outdoor-indoor and between different floors propagation scenarios.

ITU-R Rec. P.528. Empirical calculation method valid in the 125 MHz - 15.5 GHz frequency range. Recommended for aeronautical mobile and aeronautical radionavigation services using metric, decimetric, and centimeter wave bands.

ITU-R Rec. P.1147. Empirical prediction method for the frequency range between 150 and 1700 kHz approximately, for path lengths between 50 and 12000 km.

ITU-R Rec. P.533. Empirical method for predicting available frequencies, signal levels and predicted reliability for systems with analog and digital modulation in HF.