Theoretical Accuracy Analysis of Indoor Visible Light Communication Positioning System Based on Received Signal Strength Indicator

Zhang, Xueli; Duan, Jingyuan; Fu, Yuegang; Shi, Ancun

doi:10.1109/jlt.2014.2349530

Cited by 144 publications

(144 citation statements)

References 12 publications

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“…This investigation includes not only a theoretical framework, which provides a CRLB expression for position estimation in a generic three-dimensional scenario, but also direct and two-step estimation algorithms for extracting the position of a VLC receiver, which are shown to achieve accuracies as high as the theoretical limit for high signal-to-noise ratios (SNRs). Due to its low-complexity nature, asynchronous VLP systems have been considered in numerous papers in the literature such as [8], [9], [11], [12], [14], [20]- [25]. For instance, the work in [8] employs RSS measurements to obtain the desired position via trilateration.…”

Section: Introductionmentioning

confidence: 99%

Hybrid TDOA/RSS based localization for visible light systems

Kazikli

Gezici

2019

Digital Signal Processing

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In a visible light positioning (VLP) system, a receiver can estimate its location based on signals transmitted by light emitting diodes (LEDs). In this manuscript, we investigate a quasi-synchronous VLP system, in which the LED transmitters are synchronous among themselves but are not synchronized with the receiver. In quasisynchronous VLP systems, position estimation can be performed by utilizing time difference of arrival (TDOA) information together with channel attenuation information, leading to a hybrid localization system. To specify accuracy limits for quasi-synchronous VLP systems, the Cramér-Rao lower bound (CRLB) on position estimation is derived in a generic three-dimensional scenario. Then, a direct positioning approach is adopted to obtain the maximum likelihood (ML) position estimator based directly on received signals from LED transmitters. In addition, a two-step position estimator is proposed, where TDOA and received signal strength (RSS) estimates are obtained in the first step and the position estimation is performed, based on the TDOA and RSS estimates, in the second step. The performance of the two-step positioning technique is shown to converge to that of direct positioning at high signal-to-noise ratios based on asymptotic properties of ML estimation. Finally, CRLBs and performance of the proposed positioning techniques are investigated through simulations.

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Section: Introductionmentioning

confidence: 99%

Hybrid TDOA/RSS based localization for visible light systems

Kazikli

Gezici

2019

Digital Signal Processing

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“…The photo-generated shot noise corresponds to the fluctuations in the count of the photons collected by the receiver [16], [17]. The variances of the shot noise due to the background radiation ( bg ), the received signal ( rs ), and the dark current ( dc ) can be determined respectively by:…”

Section: B Noise Modelmentioning

confidence: 99%

3-D Localization With Multiple LEDs Lamps in OFDM-VLC System

2019

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Visible light communication (VLC) based localization is a potential candidate for wide range indoor localization applications. In this paper, we propose a VLC architecture based on orthogonal frequency division multiplexing (OFDM) with multiple functionalities integrated in the same system, i.e., the 3-D receiver location, the control of the room illumination intensity, as well as the data transmission capability. Herein we propose an original methodology for LED power discrimination applying spatial optical OFDM (SO-OFDM) structure for position estimation. The hybrid locator initially makes a first estimate using a weighted angle-of-arrival (WAoA)-based locator which is then used as the starting point of the recursive estimator based on the strength of the received signal (RSS). Hence, the first stage is deployed to increase convergence probability, reducing the root-mean-square error (RMSE) and the number of iterations of the second stage. Also, a performance vs computational complexity comparative analysis is carried out with parameter variations of these estimators. The numerical results indicate a decade improvement in the RMSE for each two decades of decrement of power noise on the receiver photodiode. The best clipping factor is obtained through the analysis of locator accuracy and transmission capacity for each simulated system. Finally, the numerical results also demonstrate effectiveness, robustness, and efficiency of the proposed architecture.

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“…α is the attenuation of the optical channel. We assume that the optical axis of LEDs and receivers parallel to each other [3]:…”

Section: G-crlb Of Toamentioning

confidence: 99%

“…But only few articles have analyzed the theoretical accuracy of the indoor VLC positioning system. The authors in [3] gave an indoor VLC positioning system based on the received signal strength indicator (RSSI) method and analyzed the impact of the LED parameters on positioning accuracy. It is concluded that, if the diffuse channel gain is measured previously in a certain environment and the modulation speed is far less than the channel cut-off frequency, the theoretical accuracy limit of VLC RSSI algorithm is not affected by multipath link.…”

Section: Introductionmentioning

confidence: 99%

Impact of multipath effects on theoretical accuracy of TOA-based indoor VLC positioning system

et al. 2015

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This paper discusses the time-of-arrival (TOA) based indoor visible light communication (VLC) positioning system in a non-line-of-sight environment. The propagation delay is assumed to be gamma distributed. The generalized Cramer-Rao lower bound for multipath propagation is derived as the theoretical accuracy limitation. The performance of the positioning system is affected by the shape parameter and the scale parameter of gamma distribution. The influences on positioning accuracy of multipath effects are analyzed through discussing the physical meaning of the gamma distribution parameters. It is concluded that the lower bound of positioning accuracy is attained when variance of the non-line-of-sight propagation-induced path lengths is zero. The simulation result proves that the theoretical positioning accuracy is in the order of centimeters with the given scenario.

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Theoretical Accuracy Analysis of Indoor Visible Light Communication Positioning System Based on Received Signal Strength Indicator

Cited by 144 publications

References 12 publications

Hybrid TDOA/RSS based localization for visible light systems

Hybrid TDOA/RSS based localization for visible light systems

3-D Localization With Multiple LEDs Lamps in OFDM-VLC System

Impact of multipath effects on theoretical accuracy of TOA-based indoor VLC positioning system

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