Indoor Wireless Location Algorithm

At present,with the rapid development of wireless communications,the future of technologies will be featured with higher data rate,higher level of security, intelligence and flexibility,as well as better transmission quality and QoS.On the one hand,new technologies and standards turn out endlessly;on the other hand,an isolated network is meaningless for ubiquitous users,especially for the next generation evolution.Subscribers look forward to accessing any applicable network at anytime and anywhere,with only one multi-mode terminal at hand,so the future of wireless technology should be integrated.Meantime,a wide range of business models based on wireless networks have been increasingly attracting people's attention.The original wireless network connection equipment is developing into a platform for varied business services.Among this,access to the location information has become a key to different value-added services.This dissertation discusses the possibility of the two technologies,mobile communications technology and wireless broadband access technology complementing each other after the introduction of their respective merits and deficiencies.The major applications of mobile positioning technologies and the prospects for location-based services,and the location techniques in 3G networks are also listed.Indoor positioning technology based on RSS distance-loss model is discussed in great detail then:1.An indoor distance-loss model based on relative received signal strength is set up to eliminate the effect of different reference positions;2.Two algorithms are illustrated about parameter estimation:sufficient statistics based algorithm and curve-fitting method;3.Two location algorithms based on the new distance-loss model are given out;4.Experiments in real environment are implemented to verify the production;5.An indoor location algorithm based on fingerprints,whose database is generated by Kriging interpolation is presented;6.An indoor localization system based the distance-loss model is set up with area partition,while computer assistance is adopted to simulate the real environment to obtain the users' positions;locate estimation error less than 1 meter is achieved in an indoor laboratory of 31m×26m.After that,the third generation mobile communications technology and the feasibility and advantages of the interworking of TD-SCDMA and WiMAX is discussed.