The Effect of LED Deployment on RSSI-based VLP Systems

Year 2019, Issue: 17, 823 - 832, 31.12.2019

Yasin Çelik

https://doi.org/10.31590/ejosat.628709

Abstract

In this paper, the effect of
light emitting diode (LED) deployment is investigated based on the received
signal strength indication (RSSI) technique for visible light positioning (VLP)
systems. The optical code division multiple access (OCDMA) is used as a
multiplexing technique to transmit the location and RSSI information of LEDs
simultaneously. For different highly reflective indoor scenarios, LEDs are
placed on the ceiling of a room considering homogeneous illumination. The
illuminance of the room is provided particularly with 400 lux minimally
at the desk height. In order to
demonstrate the uniformity of lighting for different indoor scenarios, the
uniformity illuminance ratio (UIR) values are also obtained in this study. In
addition, electrical signal-to-noise ratio (SNR), an important parameter for
reliable communication, is calculated at desk height for each scenario
considered and an SNR level of 45 dB is obtained at a minimum. The
simulation results demonstrate that the mean square error (MSE) of the estimated
location is reduced with an increase in the number of visible access points
(VAPs). The MSE of the distance for number of VAPs 12 and 16 are the best,
however, the scenario with 16 VAPs is preferable with a better uniformity
illuminance ratio (UIR) parameter. In terms of illuminance, all the cases have
the average illuminance value more than 450 lux.

Keywords

Visible light positioning, RSSI, Trilateration, CDMA

Supporting Institution

Aksaray Üniversitesi BAP

Project Number

2019-009

Thanks

This study was supported by Aksaray University Scientific Research Fund, grant number 2019-009.

LED Dağılımının RSSI Tabanlı Görünür Işık Konum Belirleme Sistemleri Üzerindeki Etkisi

Abstract

Bu çalışmada, ışık yayan diyot (LED) dağılımının
alınan sinyal gücü göstergesi (ASGG) tabanlı görünür ışık konum belirleme
sistemlerinin performansı üzerindeki etkisi incelenmiştir. LED’lerin konum ve
ASGG bilgisini alıcı birime göndermek için optik kod bölmeli çoklu erişim
tekniği çoğullama tekniği olarak kulllanılmıştır. Bina içi yansımanın kuvvetli
olduğu senaryolar için LED’ler tavana homojen bir aydınlatma sağlayacak şekilde
yerleştirilmiştir. Oda içindeki aydınlatma seviyesi masa yüksekliğinde minimum 400 lüks sağlanacak şekilde
ayarlanmış ve aydınlatmanın homojenliğini farklı bina içi senaryolarda ortaya
koymak için aydınlık homojenliği oranı (AHO) değerleri elde edilmiştir. Ek
olarak, güvenli haberleşme için önemli bir parameter olan elektriksel sinyal
gürültü oranı değerleri dikkate alınan her senaryo için fotodedektör (PD)
düzleminde hesaplanmış ve minimum değer
olarak 45 dB elde edilmiştir. Simulasyon sonuçları LED dizilerinin (VAP) sayısı
arttıkça kestirilen konumun ortalama karesel hata (OKH) değerinin azaldığını
göstermiştir. VAP sayısı 12 ve 16 olduğu durumda en iyi OKH değeri elde
edilmiştir. Bununla birlikte AHO değeri daha iyi olan 16 VAP içeren senaryonun
daha tercih edilebilir olduğu ortaya konmuştur. Aydınlatma açısından
bakıldığında tüm senaryolarda ortalamada 450 lüks üzerinde aydınlık düzeyi
sağlanmıştır.

Keywords

Görünür ışık konum belirleme, RSSI, Trilaterasyon, CDMA

Project Number

2019-009

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