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The art of Mobile WiMAX testing

Posted: 03 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:spectrum analysis? PHY measurements? Mobile WiMAX? broadband wireless access? WLAN?

The latest version of the WiMAX standard addresses the mobile services required to free users from the tethers of a predetermined location. As with any new technology comes the need to test its hardware--in the research labs, for product qualification and conformance testing to the standard; on the production line; and for troubleshooting and maintenance. Proper and accurate testing helps ensure full interoperability of WiMAX equipment from all manufacturers.

Since WiMAX is intended as a solution for metropolitan broadband wireless access applications, there is a need to address multipath effects from buildings and other obstructions. For this, the OFDM versions of WiMAX were developed and used in fixed WiMAX. Mobile WiMAX employs orthogonal frequency division multiple access (OFDMA), a multiple-user version of OFDM. This allows a more flexible assignment of bandwidth to multiple users than TDMA and provides lower latency.

Mobile WiMAX and fixed WiMAX have similar channel bandwidths and they share modulation types. A key difference between them is that Mobile WiMAX has been designed to hand over user connections and maintain connections across different base stations and coverage areas.

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