Protection margins for joint operation of WiMAX 802.16e and WiMedia-defined UWB radio in personal area networks

In this paper, the radio coexistence between a WiMAX 802.16e transmission operating in the 3.5 GHz band and a WiMedia-defined UWB short-range transmission is experimentally studied in a wireless personal area network scenario. Relevant protection margins related to current UWB and WiMAX coexistence are obtained from on-the-field measurements. The coexistence has been studied evaluating the interference in both directions: First, considering an 802.16e WiMAX system victim of UWB communication and, second, considering the WiMedia-defined UWB link as a victim of the WiMAX 802.16e transmission. The experimental results indicate that a victim WiMAX (with 5 MHz bandwidth) exhibit proper operation up to 5 m transmission in presence of UWB interference if a protection margin of 2.5 m is met. WiMAX 10 MHz and 20 MHz configurations work properly in LOS links up to 10 m with UWB interference in the 2.5 m close area. In the second case, the UWB victim system exhibits proper operation at TFC1 in presence of a 5 MHz WiMAX interference if a protection distance of 5 m is met when both are in joint operation at maximum transmission power.