What does LOS communication mean? Name the types of waves that are used for this communication. Give typical examples, with the help of suitable figures of communication systems that use space mode propagation.

LOS communication stands for Line-of-Sight communication. It refers to a type of communication where the transmitter and receiver have a direct line of sight or a clear, unobstructed path between them. In LOS communication, electromagnetic waves travel in a straight line from the transmitter to the receiver without significant reflection, refraction, or scattering. This type of communication is commonly used in various applications, including wireless communication and satellite communication.

The types of waves that are commonly used for LOS communication include:

Radio Waves: These are typically used in terrestrial LOS communication systems, such as point-to-point microwave links and Wi-Fi networks. Radio waves have a longer wavelength and can travel long distances in a straight line.

Microwave Waves: Microwaves are a subset of radio waves with shorter wavelengths. They are used in microwave communication systems, such as satellite links and some terrestrial point-to-point links. Microwaves offer high data transfer rates and are well-suited for LOS communication.

Infrared Waves: Infrared waves are used for short-range LOS communication, such as infrared data transmission between devices like remote controls and infrared sensors. They have shorter wavelengths than radio and microwave waves.