Shu (Marloon) Wang

[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] The GNSS research institutes and academics have been looking for a stable and workable open source measurement engines and positioning engines for a long time.  Regarding positioning engines, it seems that  Tomoji Takasu 's open source RTKLIB  pretty much is the de facto standard reference and baseline.  At the same time, there are also many positioning engine options, such as GNSS-SDR  by  CTTC , GNSS-SDRLIB  by Prof. Taro Suz...

[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] Satellites based positioning and navigation are widely believed to be the cornerstone for emerging autonomous driving and IoT (internet of things) services. However, traditional GNSS receiver architectures can hardly meet many mission critical demands, including better than -170 dBm sensitivity, centimeter level accuracy, 100 Hz or higher update frequency, less than 1 watt power consumption, less than 1 second cold start TTFF, etc, particularly considering GNSS...

How to Improve Forward Link Positioning ... ? I. Introduction 1x HDP Enhancements Enhanced Location Based Services Support in cdma2000 Enhance Downlink Positioning in WiMAX/16m How Wide A Widband Channel Should Be? IEEE ICC 2008 Tutorial, Location Based Services for Mobiles Location Based Services for Mobiles: I. Introduction Hearability Issue Hearability of a forward-link positioning system usually is quantified by how many reference signals a terminal may utilize to make a positioning fix in a pre-defined positioning duration.  In theory, a terminal need measure parameters of only 4 different reference signals for a precise three-dimension fix.  However, more reference signals a terminal can use, more diversity benefits a terminal may use for a more accurate positioning fix. A hearability issue of a cellular positioning network generally is a dimension limitation issue.  It mostly is due to limitations of network geometry and network deployment. ...

[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 plac...

[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...