NLOS, short for Non-Line-of-Sight, refers to a term commonly used in the fields of wireless communication and military operations. It describes a condition or situation where direct line-of-sight between transmitters and receivers is obstructed or not possible due to physical barriers, such as buildings, walls, terrain features, or other objects.
In the context of wireless communication, NLOS refers to a communication link that does not rely on direct, unobstructed propagation between the transmitting and receiving antennas. Instead, it utilizes indirect paths or scattered signals that bounce off or diffract around objects to establish communication. This can be achieved using techniques like reflection, diffraction, or multipath propagation, where multiple delayed signals arrive at the receiver.
NLOS communication is especially significant in urban environments, where tall buildings and cluttered structures often obstruct the direct line-of-sight between wireless devices. It is commonly used in applications such as wireless broadband networks, wireless backhaul solutions, and indoor wireless systems.
In military operations, NLOS refers to a tactical scenario where weapons or systems are capable of hitting targets or transmitting information without direct visibility or exposure to the enemy. This can include scenarios involving the use of guided missiles, drones, or communication systems that utilize satellite or radio waves to transmit data over non-line-of-sight paths.
Overall, NLOS describes the ability to establish communication or conduct operations without requiring a clear, unobstructed line-of-sight between transmitters and receivers.
