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Miscellaneous WLAN-based localization methods focus on preferably precise location estimation and tracking. However, the infrastructure of a WLAN system can also be utilized for relative spatial assessment within discrete zones, not using a reference coordinate system. This paper proposes a WLAN-based localization prototype that is capable of unambiguously distinguishing detached interaction zones, allowing applications to imitate Near Field Communication (NFC). Operation is accomplished by customary mobile devices not equipped with NFC technology but a WLAN interface. A prototypical payment scenario at cash desks in a store proves the concept, where customers are required to securely show their electronic store card, i.e., bring their mobile device into a near, non-interfering zone to their cashier.
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