The Effect of LED Deployment on RSSI-based VLP Systems

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

LED Dağılımının RSSI Tabanlı Görünür Işık Konum Belirleme Sistemleri Üzerindeki Etkisi

Öz

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.

Anahtar Kelimeler

• Görünür ışık konum belirleme,RSSI,Trilaterasyon,CDMA

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