Shu (Marloon) Wang

[IEEE C802.16m-08/1105 Network Assisted GPS (N-GPS) Positioning in WiMAX/16m] [Location Based Service for Mobiles I: Technologies and Standards] GPS - Global Positioning System Figure 1. GPS System Archiecture: Space Segment, Control Segment and User Segment GPS is a Global Navigation Satellite System for determining the positions of receivers using signals broadcast by satellites.  It was developed and operated by US government to enhance the effectiveness of allied and US military forces.  The first experimental Block-I GPS satellite was launched in 1978. Since 1983, GPS has become an aid to civilian navigation worldwide, and a useful tool for survey, commerce, and scientific uses.  As of September 2007, there are 31 actively broadcasting satellites in the GPS constellation.  Satellites orbit 20,163 kilometers above the earth at 3.87 km/s.  6 orbital planes, each with 4+ satellites. Typically 6 to 12 satellites are visible from any place on the earth.  GPS based po

[Tutorial in IEEE International Conference on Communications (ICC) 2008] [Location Based Services for Mobiles II: GPS, Assisted GPS and Network Assisted GPS] [How to Improve Forward Link Positioning ... ? I. Introduction] [How to Improve Forward Link Positioning ... ? II. Hearability and Accuracy] [1x HDP Enhancements] [Enhanced Location Based Services Support in cdma2000] [IEEE C802.16m-08/1106 Enhance Downlink Positioning in WiMAX/16m] [IEEE C802.16m-08/1105 Network Assisted GPS (N-GPS) Positioning in WiMAX/16m] Location based services (LBS) for mobile are the services supported by cellular networks for providing mobile users with various location sensitive applications such as E911, Friendfinder, personalized advertisement, etc. LBS accelerate the convergence of 3C (computer, communication and consumer electronics). One aspect of LBS market is the rapid growth of GPS market, which is predicted to reach $28.9 billion by 2010 by GPS World. It is believed that LBS is bringing