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How can I make my apartment WIFI signal stronger? 

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Corresponding, good signal strength will makes WiFi energy consumption decreased.
For home and work environments, aggressive WiFi scans can significantly improve the speed at which mobile nodes join the WiFi network.
Experiment results show that obstacle materials made of concrete reducing WiFi signal the most, followed by metal and wood.
For example, smartphones generally show worse WiFi performance than other WiFi devices (e. g., laptops and tablets) because smartphones suffer from additional signal loss due to hand-grips and the low antenna gains of their embedded antennas.
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.
We develop a new digital signal processing algorithm called Common Multiple Folding (CMF) that accurately amplifies periodic beacons in WiFi interference signals.
Unfortunately, the WiFi received signal strength (RSS) is susceptible by multipath, signal attenuation, and environmental changes, which is the major challenge for accurate indoor localization.
We demonstrate that we can recover the user positions and thus simultaneously generate dense signal maps for each WiFi access point and 4G LTE small cell, “from the pocket”.
Open accessProceedings ArticleDOI
Shu Liu, Aaron Striegel 
13 Aug 2012
31 Citations
We believe the root cause of lesser WiFi utilization can be traced to the WiFi being optimized for laptop WiFi reception rather than the more constrained smartphone WiFi reception.
The research result indicates this system can reflect quality of mine limited space WIFI signal accurately,objectively and efficiently.