Abstract
ABSTRACT Congested Industrial, Scientific, and Medical (ISM) band stifles the growth of Wireless Local Area Network (WLAN). The recent switchover from analog to digital TV (DTV) broadcast frees from the conventional TV bands a sizeable amount of spectrum, which is commonly called TV white space (TVWS). TVWS is very attractive to many wireless technologies, including WLAN. IEEE came up with 802.11af, the standard for the WLAN technology that operates in TVWS. Nevertheless, it is unsure how best to guarantee its operation not causing harmful interference to DTV. In this paper, we present the conditions required for harmless coexistence of IEEE 802.11af WLAN and DTV. We make use of the standard prediction method based on radio propagation characteristics, i.e. the ITU-R P.1411-9 method which has been adopted in communication system planning. Based on our findings, we suggest the followings: (1) Operate IEEE 802.11af WLAN at any adjacent channel other than the first (i.e. except the closest neighbour channel). (2) The height of IEEE 802.11af installation does play a part when there is a relatively large separation distance between the WLAN and DTV (e.g. 50 m). (3) For outdoor operation, IEEE 802.11af WLAN should be installed at the second, third, or fourth channels adjacent to the DTV’s; fifth or sixth adjacent channel for indoor operation.
Published Version
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