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However, the multi-path fading of WiFi signals causes time-varying received signal strengths of WiFi signals, which leads to poor accuracy of WiFi localization.
Based on the measurement results from our real-world deployments, we made three main observations: 1) in general, higher AP density improves WiFi performance; 2) over-dense deployment with unnecessarily high transmission power can worsen WiFi performance.
Through a large scale measurement study involving over 10,000 WiFi APs we show that channel measurements and selection are most effective when performed frequently (every few minutes).
First, through analyzing traces collected on 3785 smartphones for at least one month, we show that poor signal strength of both 3G and WiFi is routinely experienced by smartphone users, both spatially and temporally.
In fact, the more friendly the building to WiFi signal, the more efficient the 802.11 based wireless infrastructure.
Results show a median gain of up to 2x when WiFi links are strong; when links are weak and the network density is high, the gains can be even more.
Performance evaluation demonstrates that WiFi-BA is more efficient than current Wi-Fi solutions.
For home and work environments, aggressive WiFi scans can significantly improve the speed at which mobile nodes join the WiFi network.
Our results supported that the WiFi-aided MM algorithm provided more reliable solutions than both WiFi and MM in the areas that have poor WiFi signal distribution or indistinctive magnetic-gradient features.