Report on Radio Frequency Compatibility Measurements between UWB LDC Devices and Mobile WiMAX (IEEE 802.16e-2005) BWA Systems

摘要

In 2006 the ECC examined the impact of pulsed Low-Duty Cycle (LDC) UWB signals on the quality of various services (FTP, VoIP, video streaming) provided via a fixed WiMAX (IEEE802.16d) link, and published its findings in ECC Report 94 [1] . The resulting spectrum regulation and standardization stipulate a maximum UWB activity (Ton) of 50 ms per second, with a maximum permissible pulse width of 5 ms. Report 94 showed that for activity factors of 5% there was no measurable impact on any of the victim services if a minimum distance of 4 meters (LOS) between the UWB interferer and the WiMAX terminal was maintained.As fixed WiMAX terminals are typically mounted outdoors in elevated positions the isolation between a WiMAX terminal and LDC UWB devices will in most cases be sufficiently high to avoid interference. Mobile WiMAX (IEEE802.16e-2005) terminals, however, may be operating indoors, in close vicinity to a UWB device. On the other hand, mobile WiMAX was designed to be more robust against fading and interference than fixed WiMAX.The objective of the measurement campaign described in this document was to determine the impact of UWB LDC signals on different types of services provided by a mobile WiMAX (IEEE802.16e-2005, further on referred to as “WiMAX”) victim system, and in particular to examine LDC pulses with a width of more than 5 ms, whilst maintaining an overall activity limit of 5%, equalling 50 ms per second.