An OFDM/FDMA Indoor Geolocation System

Progri, Ilir F.; Michalson, William R.; Cyganski, David

doi:10.1002/j.2161-4296.2004.tb00346.x

Cited by 14 publications

(26 citation statements)

References 8 publications

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“…Also, their use of multiple frequencies provides redundancy to protect against multipath fades. Another is presented by Progri et al (2004), who propose a very unique indoor positioning system using ultra-wideband (UWB) signals. This system uses orthogonal frequency division multiplexing (OFDM) with frequency division multiple access (FDMA) that minimizes cross-channel interference.…”

Section: Future Directionsmentioning

confidence: 99%

Limitations of Pseudolite Systems Using Off-The-Shelf GPS Receivers

Kanli¹

2004

J. of GPS

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Abstract. Pseudolites (PLs) are ground-based transmitters that transmit GPS-like signals. They have been used to test GPS system elements and to enhance GPS in certain applications by providing better accuracy, integrity and availability through the use of PL signals in addition to the GPS signals. PLs are also a promising technology for providing positioning in indoor, high multipath environments where GPS signals are generally unavailable or severely attenuated and of questionable quality. In experiments to date, researchers have almost exclusively used PLs that transmit C/A code on L1/L2 in order to use existing off-the-shelf GPS receivers. This is because no hardware modifications to the GPS receiver are necessary and only minor changes to the receiver firmware are needed to track a PL's signal. However, there are some fundamental issues that limit the effectiveness of a PL system using C/A code on L1/L2. These include the legality of transmitting on L1/L2, cross-correlation between PL and GPS signals, saturation of GPS receiver front-ends, and the limited multipath mitigation offered by C/A codes. When combined with other problems inherent to all PL systems such as nearfar, multipath, and synchronization, the issues in using L1/L2 C/A code PL systems further complicates the design and deployment of such systems and places limits on its operational effectiveness. This paper presents the issues which limit PL systems that use GPS hardware and explores the impact of these issues on some common PL applications.

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Section: Future Directionsmentioning

confidence: 99%

Limitations of Pseudolite Systems Using Off-The-Shelf GPS Receivers

Kanli¹

2004

J. of GPS

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“…An indoor geolocation system is a geolocation system that operates indoors. Indoor geolocation systems have emerged as a means to render localization and navigation to people and personnel inside buildings, tunnels, or obstructed areas due to limited capabilities of outdoor geolocation systems in such environments [1][2][3][4][5][6]. These systems may contain fixed transmitters, wireless networks, or mobile units, in cases such as ad hoc networks as depicted in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…These systems may contain fixed transmitters, wireless networks, or mobile units, in cases such as ad hoc networks as depicted in Figure 1. Such systems can be classified as satellite/pseudolite, wireless and other indoor geolocation systems [3]. Figure 1 contains all the state-of-the-art indoor geolocation systems that are available on the market or are in the design and development process.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 contains all the state-of-the-art indoor geolocation systems that are available on the market or are in the design and development process. A detailed discussion of these systems and the issues associated with each system is provided in [3].…”

Section: Introductionmentioning

confidence: 99%

“…The main engineering issue with building such a system is the availability of a suitable infrastructure; thus, a portable ad-hoc network would be desirable. Such a network, would consist of groundbased transmitters (or pseudolites) and portable (or handheld) receivers [1,3,7].…”

Section: Introductionmentioning

confidence: 99%

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Indoor Geolocation Using FCDMA Pseudolites: Signal Structure and Performance Analysis

et al. 2007

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The signal structure performance of a direct sequence spread spectrum (DSSS) code division multiple access (CDMA) frequency division multiple access (FDMA) pseudolite indoor communication and localization (geolocation) system is presented and discussed in this paper. The signal structure of a DSSS‐FCDMA (or C‐CDMA) pseudolite indoor geolocation system appears to elegantly solve the near‐far problem when subject to a slowly varying frequency‐selective Rayleigh fading channel with additive white Gaussian noise and Doppler shift, which is the main obstacle of a DSSS‐CDMA pseudolite indoor geolocation system at roughly equal transmitter and post radio frequency (RF) receiver complexity. Based on our theoretical analysis and simulation results, it appears that FCDMA (or C‐CDMA) signal structure may be a suitable candidate for indoor geolocation to achieve 3D centimeter level position accuracy and 3D centimeter‐per‐second level velocity accuracy 99.9% of the time.

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GPS/GNSS Current Bibliography

Soler

2004

GPS Solutions

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An OFDM/FDMA Indoor Geolocation System

Abstract: An OFDM/FDMA (or spectralized UWB) indoor geolocation system uses a profile for the configuration of the bandwidth allocation, which determines which portions of the spectrum can and cannot be allocated.

Cited by 14 publications

References 8 publications

Limitations of Pseudolite Systems Using Off-The-Shelf GPS Receivers

Limitations of Pseudolite Systems Using Off-The-Shelf GPS Receivers

Indoor Geolocation Using FCDMA Pseudolites: Signal Structure and Performance Analysis

GPS/GNSS Current Bibliography

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