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Firstly, the technical features and frequency characteristics of IEEE802.11x protocol in wireless local area network (WLAN) are introduced. The functional relationship of path loss and coverage distance in dense urban and suburb is shown in figures. The uplink and downlink radio power budget of current WLAN outdoor coverage is calculated. Secondly, calculation and comparison of WLAN pass loss, link budget and cell coverage radius is done for dense urban and suburb. Thirdly, hot spot area WLANdoi:10.1016/j.proeng.2011.08.1025 fatcat:6mhtl5lt3zfxhfynbjjpcg7xje