What are the types of propagation models?
The two basic propagation models (Free-Space and Plane Earth Loss) have all the mechanisms which are encountered in macrocell prediction. Many researchers use these models and predict the total signal loss.
What is propagation modeling?
Propagation modelling is key for wireless operators to plan and optimise radio access network as it allows simulating pathloss, coverage and interference of a network configuration modelled by the radio planning and optimisation tool.
What radio frequency is best for non line of sight reception?
Frequencies that are affected by ionospheric propagation range from approximately 500 kHz to 50 MHz but the majority of such NLOS links operate in the ‘short wave’ or high frequency (HF) frequency bands between 3 MHz and 30 MHz.
What is non line of sight communication?
Non-line of sight is a term often used when the radio transmitter and receiver are not in the direct visual line of sight, and this is dealt with by the use of multiple paths in signal propagation. Non-line of sight can be overcome with the use of antennas and other such communication devices.
What do you understand by LOS and NLOS?
LOS stands for Line of Sight and NLOS stands for Non Line of Sight. Link to wireless channel models are also mentioned. Refer types of channel models>> used in wireless signal propagation.
What is the difference between LOS and NLOS?
If the Fresnel Zone is free from any obstruction, then the path is considered Line of Site (LOS). If there is anything within the Fresnel Zone but blocking less than 60% this is considered nLOS. An obstruction covering more than 60% of the Fresnel is considered NLOS.
Is WiFi non-line-of-sight?
5 GHz Bridge- Long Range NLOS Wireless Bridge The GS-5800, 5.8 WiFi / Wireless bridge system, is a high gain, commercial Non-Line-of-Sight bridge with 24dB integrated high gain antenna.
What is the application of line of sight propagation method?
The most common application of Line-of-Sight propagation in its most basic form is in Radar technology. The device transmits a radio pulse towards an object and waits for the echo to return. The distance of the object is obtained by calculating the time it took for the echo to return and the radio wave’s speed.
Is AM radio line-of-sight?
In contrast to line-of-sight propagation, at low frequency (below approximately 3 MHz) due to diffraction, radio waves can travel as ground waves, which follow the contour of the Earth. This enables AM radio stations to transmit beyond the horizon.
Is 2.4 GHz a line of sight?
Radio transmission requires a clear path between antennas known as radio line of sight. It is necessary to understand the requirements for radio line of sight when designing a network operating in the 2.4Ghz or 5.2/5.8Ghz ISM band. Line of sight is the direct free-space path that exists between two points.
Does 2.4 GHz need line of sight?
Both frequencies need “line-of-sight” for proper and predictable operation. However some type of obstructions are more detrimental to a 2.4 GHz link. Trees with leaves that have dimensions near the wavelength of 2.4 GHz (but typically shorter than the wavelength of 900 MHz), will cause higher attenuation at 2.4 GHz.