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In this paper, we present a two-way TOA technique for distance estimation (i.e., ranging) over IEEE 802.11 networks. It is based on repetitively measuring the Round Trip Time (RTT) of IEEE 802.11 MAC frames and carrying out statistical processing in order to identify the multi-path condition of the channel and to improve accuracy. The study demonstrates that a multi-path condition has a negative impact...
TOA-based methods represent an interesting alternative to overcome important constraints of the existing fingerprinting solutions to locate WiFi devices indoors, especially in terms of accuracy, stability and quick deployment. However, in some situations the scalability of TOA-based methods to large number of users is expected to be degraded because of the traffic generated by the positioning process...
Omówiono zagadnienie dotyczące lokalizacji terminali wewnątrz budynków. Krótko przedstawiono zjawiska zachodzące w kanale radiowym oraz scharakteryzowano profile opóźniania mocy, jakie występują w takim środowisku. Opisano techniki lokalizacji terminali, jakie mogą zostać zastosowane w tym specyficznym środowisku propagacyjnym oraz możliwości praktycznej realizacji systemów lokalizacji we wnętrzach...
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