Browse Definitions:
Definition

line of sight (LOS)

Contributor(s): Matthew Haughn

Line of sight (LOS) is the level of obstruction on the path between two points.

The level of obstruction in a LOS determines not only the visibility from one point to another but also the quality of signal reception for wireless transmissions, such as Wi-Fi. Clear LOS is necessary for infrared wireless networking or LED-based Li-Fi.

Analysis of line of site is particularly important for planning wireless network deployment. A clear line of site between two antennas is ideal for the best reception. However, a radio signal can permeate and bend or bounce around some obstruction, unlike line of sight for an eye. LOS is often categorized with separate abbreviations for the different levels of obstruction. A fully open path is the situation abbreviated as LOS. A near line of site with partial obstructions is abbreviated as nLOS and a completely blocked non-line of sight as NLOS.

Radio frequencies penetrate more materials than photons but this penetration is not uniform and depends on density of the materials or having holes large enough for the radio waves to penetrate. A wood wall is much easier penetrated by radio than concrete, for example, and metals are even less penetrable. The dependency on density means that a clear LOS matters and that if there are any obstructions, what those obstructions are made of matters as well.

To improve the performance of a wireless network, reducing the amount of equipment required and thus the cost, it’s important to carefully consider LOS obstructions and their materials, as well as interfering networks and radio noise from other electronic and mechanical equipment around wireless gateways or antennas.

This was last updated in January 2017

Continue Reading About line of sight (LOS)

Start the conversation

Send me notifications when other members comment.

By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Please create a username to comment.

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • smart contract

    A smart contract, also known as a cryptocontract, is a computer program that directly controls the transfer of digital currencies...

  • risk map (risk heat map)

    A risk map, also known as a risk heat map, is a data visualization tool for communicating specific risks an organization faces. A...

  • internal audit (IA)

    An internal audit (IA) is an organizational initiative to monitor and analyze its own business operations in order to determine ...

SearchSecurity

  • evil maid attack

    An evil maid attack is a security exploit that targets a computing device that has been shut down and left unattended.  An evil ...

  • Common Body of Knowledge (CBK)

    In security, Common Body of Knowledge (CBK) is a comprehensive framework of all the relevant subjects a security professional ...

  • rootkit

    A rootkit is a program or, more often, a collection of software tools that gives a threat actor remote access to and control over...

SearchHealthIT

  • value-based healthcare

    Value-based healthcare, also known as value-based care, is a payment model that rewards healthcare providers for providing ...

  • health informatics

    Health informatics is the practice of acquiring, studying and managing health data and applying medical concepts in conjunction ...

  • clinical trial

    A clinical trial, also known as a clinical research study, is a protocol to evaluate the effects and efficacy of experimental ...

SearchDisasterRecovery

  • crisis communication

    Crisis communication is a method of corresponding with people and organizations during a disruptive event to provide them with ...

  • Zerto

    Zerto is a storage software vendor that specializes in enterprise-class business continuity and disaster recovery in virtual and ...

  • crisis management plan (CMP)

    A crisis management plan (CMP) is a document that outlines the processes an organization will use to respond to a critical ...

SearchStorage

  • cache memory

    Cache memory, also called CPU memory, is high-speed static random access memory (SRAM) that a computer microprocessor can access ...

  • RAID 10 (RAID 1+0)

    RAID 10, also known as RAID 1+0, is a RAID configuration that combines disk mirroring and disk striping to protect data.

  • Red Hat OpenStack Platform

    Red Hat OpenStack Platform is a commercially supported distribution of open source OpenStack software designed to build and ...

SearchSolidStateStorage

  • hybrid hard disk drive (HDD)

    A hybrid hard disk drive is an electromechanical spinning hard disk that contains some amount of NAND Flash memory.

Close