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Frequency-division multiple access (FDMA) is a channel access method used in some multiple-access protocols. FDMA allows multiple users to send data through a single communication channel, such as a coaxial cable or microwave beam, by dividing the bandwidth of the channel into separate non-overlapping frequency sub-channels and allocating each sub-channel to a separate user.
The frequency-division multiple access (FDMA) channel-access scheme is the most standard analog system, based on the frequency-division multiplexing (FDM) scheme, which provides different frequency bands to different data streams. In the FDMA case, the frequency bands are allocated to different nodes or devices.
Where frequency-division multiplexing is used as to allow multiple users to share a physical communications channel, it is called frequency-division multiple access (FDMA). [ 1 ] FDMA is the traditional way of separating radio signals from different transmitters.
Unsourced material may be challenged and removed. Find sources: "Orthogonal frequency-division multiple access" – news · newspapers · books · scholar · JSTOR ( August 2018 ) ( Learn how and when to remove this message )
Unsourced material may be challenged and removed Find sources: "Multi-frequency time-division multiple access" – news · newspapers · books · scholar · JSTOR ( September 2010 ) ( Learn how and when to remove this message )
This is a list of building materials. Many types of building materials are used in the construction industry to create buildings and structures . These categories of materials and products are used by architects and construction project managers to specify the materials and methods used for building projects .
Holcim is a Swiss-based global building materials and aggregates flagship division of the Holcim Group. The original company was merged on 10 July 2015 with Lafarge to form LafargeHolcim as the new company and renamed to Holcim Group in 2021. The Holcim brand remained active within the group when the merger was completed.
Kingspan Group plc is a building materials company based in Ireland, trading in over 80 countries with more than 210 factories employing over 22,000 people.The company operates with six divisions; Insulated Panels, Insulation, Light & Air, Water & Energy, and, Data & Flooring, Roof & Waterproofing.