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This paper studies the problem of location privacy protection in Wireless LAN (WLAN) environment, where Received Signal Strength (RSS) at Access Points (AP) can potentially be obtained by adversaries to obtain the location of a legitimate mobile station. The authors propose a two-step location privacy protection scheme using a linear smart antenna array on the mobile station. In the first step, the mobile station observes the arrangement of surrounding APs by moving around and estimating the path losses from itself to the APs. Based on the path loss information, in the second step, the mobile station optimizes the radiation pattern of its smart antenna so that its location privacy is protected while its communication quality is not affected.
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