Sunday, October 25, 2009

Dynamic Frequency Selection (DFS)

Dynamic frequency selection is a process that allows devices or users to request, select or change an operating frequency at various times. Dynamic frequency selection involves sensing and assigning communication channels (such as radio frequencies) to transmitters (such as a radio base station) as they are required. The use of dynamic frequency selection in a WiMAX system allows for interference avoidance.

Interference avoidance is a process that adapts the access channel sharing method so that the transmission does not occur on specific frequency bandwidths. Using interference avoidance, devices that operate within the same frequency band and within the same physical area can detect the presence of each other and adjust their communication system to reduce the amount of interference caused by each other. This reduced level of interference increases the amount of successful transmissions therefore increases the efficiency and increases the overall data transmission rate. Dynamic frequency selection is used by WiMAX systems that operate in unlicensed frequency bands.

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