Indoor location estimation with optical-based orthogonal frequency division multiplexing communications

Aminikashani, Mohammadreza; Gu, Wenbin; Kavehrad, M.

doi:10.1117/1.oe.55.5.056116

Cited by 15 publications

(10 citation statements)

References 36 publications

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“…The selection of the frequencies can be based on the discrete Fourier transform, resulting in orthogonal frequency division multiplexing (OFDM), which is commonly considered for optical wireless communication [20]- [23]. The window-function is a smooth function, e.g.…”

Section: Transmitted Optical Signalsmentioning

confidence: 99%

Theoretical Lower Bound for Indoor Visible Light Positioning Using Received Signal Strength Measurements and an Aperture-Based Receiver

Steendam

Wang

Armstrong

2017

J. Lightwave Technol.

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Indoor visible light positioning (VLP) using signals transmitted by lighting LEDs is a topic attracting increasing interest within the research community. In recent years, VLP techniques using a range of receiver structures and positioning algorithms have been described. In this paper we analyze the performance of a VLP system which uses an aperture-based receiver and measurements of received signal strength. An aperture-based receiver has a number of receiving elements each consisting of a photodiode and an associated aperture. It has been shown that receivers of this form can be designed which are compact and provide both a wide overall field-of-view and good angular diversity. As a result they can efficiently extract positionrelated information from light transmitted by non-directional LEDs. In our approach, we correlate the signals at the outputs of the photodiodes with a set of reference signals. The resulting observations include information on the received signal strength as well as the angle-of-arrival, and are used to directly estimate the receiver's position. In order to assess the performance of positioning algorithms based on this approach, we derive the Cramer-Rao lower bound on the position estimate. We show that the Cramer-Rao bound depends on the selected reference signal, and that sub-centimetre to centimetre accuracy can be obtained, using only a limited number of non-directional LEDs.

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Section: Transmitted Optical Signalsmentioning

confidence: 99%

Theoretical Lower Bound for Indoor Visible Light Positioning Using Received Signal Strength Measurements and an Aperture-Based Receiver

Steendam

Wang

Armstrong

2017

J. Lightwave Technol.

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“…In Ref. 18, multipath distortions and the effect of noise were considered, but the SNR was very high (i.e., SNR ¼ 25 dB) and the positioning error was around 1 m. Finally, in Refs. 19 and 20, the effect of multipath is considered, but the influence of noise is neglected and the localization errors were relatively high.…”

Section: Introductionmentioning

confidence: 99%

Indoor visible light communication localization system utilizing received signal strength indication technique and trilateration method

Mousa¹,

Almaadeed

Busawon³

et al. 2018

Opt. Eng.

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“…There are several studies that analyze the effects of MPs, in communications and LPS systems, based on the impulse response [ 11 , 12 , 13 , 14 ]. The work in [ 15 ] analyzes the impact of high order light reflections on indoor optical wireless communication.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Effect of Optical Signal Multipath

De-La-Llana-Calvo

Galilea

Gardel

et al. 2017

Sensors

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Here, we propose a model to determine the effect of multipath in indoor environments when the shape and characteristics of the environment are known. The main paper goal is to model the multipath signal formation to solve, as much as possible, the negative effects in light communications, as well as the indoor positioning errors due to this phenomenon when using optical signals. The methodology followed was: analyze the multipath phenomenon, establish a theoretical approach and propose different models to characterize the behavior of the channel, emitter and receiver. The channel impulse response and received signal strength are obtained from different proposed algorithms. We also propose steps for implementing a numerical procedure to calculate the effects of these multipaths using information that characterizes the environment, transmitter and receiver and their corresponding positions. In addition, the results of an empirical test in a controlled environment are compared with those obtained using the model, in order to validate the latter. The results may largely vary with respect to the cell size used to discretize the environment. We have concluded that a cell size whose side is 20-times smaller than the minimum distance between emitter and receiver (i.e., 10 cm × 10 cm for a 2-m distance) provides almost identical results between the empirical tests and the proposed model, with an affordable computational load.

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Indoor location estimation with optical-based orthogonal frequency division multiplexing communications

Cited by 15 publications

References 36 publications

Theoretical Lower Bound for Indoor Visible Light Positioning Using Received Signal Strength Measurements and an Aperture-Based Receiver

Theoretical Lower Bound for Indoor Visible Light Positioning Using Received Signal Strength Measurements and an Aperture-Based Receiver

Indoor visible light communication localization system utilizing received signal strength indication technique and trilateration method

Modeling the Effect of Optical Signal Multipath

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