I wish to offer services near the airport or other government or military installation. Will License-Exempt WiMAX cause interference?
While the 5GHz spectrum has been deregulated in many countries, commercial installations and government radar often continue to co-exist in this spectrum. It is absolutely necessary to ensure that growth of wireless broadband networks do not interfere with the proper operation of these sensitive radar systems. Regulators have suggested the use of a feature called Dynamic Frequency Selection (DFS) to eliminate the possibility of wireless broadband systems occupying the same spectrum as government radar installations. DFS periodically scans the airwaves to detect and avoid channels being used by radar signals. Transmission stops immediately when interference occurs, the system searches for a clear channel, and the new frequency is broadcast from the base unit to all subscriber units within the sector. If no clear channel can be found, the wireless broadband system enters a “sleep mode” where no transmission occurs until the radar has vacated the channel. Aperto Networks’ 802.16d complian
