Smart cars, smart highways

Collier, Wesley; Weiland, Richard J.

doi:10.1109/6.272224

Cited by 75 publications

(22 citation statements)

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“…To obtain the location estimate from the raw ToA data, the following function is formed: (6) where the 's are weights reflecting the reliability of the signal received at BS . The location estimate is determined by minimizing the function .…”

Section: ) Unconstrained Nl-ls Approachmentioning

confidence: 99%

“…Also, the Federal Communication Commission has recently released an order, to be implemented in two phases, requiring cellular service providers to provide a mechanism for generating subscriber location estimates for Enhanced-911 (E-911) services [5]. A further application of location technology is in the rapidly emerging field of intelligent transportation systems (ITS's), which are designed to enhance highway safety, system operating efficiency, environmental quality, and energy utilization in transportation [6], [7]. Each of the above applications requires a method for determining and relaying the location of vehicular and pedestrian mobile stations (MS's).…”

Section: Introductionmentioning

confidence: 99%

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Subscriber location in CDMA cellular networks

Caffery

Stuber

1998

IEEE Trans. Veh. Technol.

371

193

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Abstract-Subscriber radio location techniques are investigated for code-division multiple-access (CDMA) cellular networks. Two methods are considered for radio location: measured times of arrival (ToA) and angles of arrival (AoA). The ToA measurements are obtained from the code tracking loop in the CDMA receiver, and the AoA measurements at a base station (BS) are assumed to be made with an antenna array. The performance of the two methods is evaluated for both ranging and two-dimensional (2-D) location, while varying the propagation conditions and the number of BS's used for the location estimate.

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Section: ) Unconstrained Nl-ls Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Subscriber location in CDMA cellular networks

Caffery

Stuber

1998

IEEE Trans. Veh. Technol.

371

193

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“…Vehicles (e.g., cars, motorcycles) could be guided along a highway by integrated UWB technology along the road. UWB devices placed inside the vehicles or on the MT enable them to communicate and, thus, provide real time local intelligence in order to avoid accidents [62].…”

Section: A Application Scenariosmentioning

confidence: 99%

Potential of UWB Technology for the Next Generation Wireless Communications

Chong¹,

Watanabe²,

Inamura³

2006

2006 IEEE Ninth International Symposium on Spread Spectrum Techniques and Applications

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Abstract-This paper discusses the potential deployment of ultra-wideband (UWB) radio technology for next generation wireless communications. Firstly, the state-of-art in UWB technology is reviewed. Then, the current status of worldwide regulatory efforts and industrial standardization activities is discussed. Various technical challenges that remain to be solved prior to the successful deployment of UWB systems as well as the possible technical approaches are also reported. Specifically, we envisioned the potential of location awareness capabilities to provide new applications and usage models for future mobile terminals. An overview of the existing ranging and localization techniques is presented and some technical aspects as well as design trade-offs in terms of device complexity and ranging accuracy are highlighted. Finally, since UWB systems operate as overlay systems, issues of coexistence and interference with existing narrowband systems are presented.

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“…Two key technologies, Multiple Input Multiple Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) have been adopted in Mobile WiMAX standard [9], which enable high data rate transmission over multipath and fading channels. An ITS (Intelligent Transportation System) is to make the vehicles more intelligent in order to enhance the safety and at the same time increases the efficiency of highway utilization [10], is the deployment environment where the work will be implemented. WIMAX provides broadband wireless access up to 30 miles for fixed stations and 3 -10 miles for mobile stations [11].…”

Section: Introductionmentioning

confidence: 99%