Wireless Location in CDMA Cellular Radio Systems

1. Front Matter

   Pages i-xiv

   PDF

2. Introduction

   Pages 1-11

3. System and Channel Models

   Pages 13-22

4. Location Methods and Impairments

   Pages 23-40

5. Algorithms for Radiolocation

   Pages 41-66

6. Performance of Location in CDMA Systems

   Pages 67-86

7. To A Estimation in Multiple-Access Interference

   Pages 87-119

8. Analysis and Mitigation of NLoS Effects

   Pages 121-139

9. Provisions for Location in Wireless Standards

   Pages 141-144

10. Conclusions & Future Directions

    Pages 145-150

11. Back Matter

    Pages 151-189

    PDF

With the increasing market penetration of cellular telephones, the number of E-911 calls placed by cellular telephones has grown cons- erably. This growth in E-911 calls led to a 1996 FCC ruling requiring that all cellular, PCS, and SMR licensees provide location information for the support of E-911 safety services. The provision of such location information is to be implemented in two phases. Phase I, whose deadline has already been passed, requires that wireless carriers relay the caller’s telephone number along with location of the cell site and/or sector se- ing the call, to a designated Public Safety Answering Point (PSAP). This information allows the PSAP to return the call if disconnected. Phase II, to be completed by October 1, 2001, is much more stringent and requires that the location of an E-911 caller be determined and reported with an rms location accuracy of 125 m in 67% of the cases. The applications of wireless location technology extend well beyond E-911 services. Location information can be used by cellular telephone operators themselves for more effective management of their radio - sources, so as to achieve greater spectral efficiencies. Resource m- agement algorithms such as hand-offs between cell sites, channel assi- ments, and others can all benefit from subscriber location information. Location information obtained from vehicular based cellular telephones can be used as an input to Intelligent Transportation Systems (ITS), and in particular traffic management and traveler information systems.

• Kalman filter
• Standard
• Standards
• communication
• filter
• network
• radio

• University of Cincinnati, Cincinnati, USA

  James J. Caffery

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