可見光通訊使用軟體可重新配置分波長多工之研究

A Study of Software Reconfigurable WDM-VLC Systems

簡聖桓(Sheng-Huan Jian)

指導教授 ： 張正春

國立臺北科技大學/電資學院/電機工程系研究所/碩士(2014年)

摘要

在本論文中，主要探討在可見光通訊(Visible Light Communication, VLC)系統下，應用多輸入多輸出(Multiple Input Multiple Output, MIMO)訊號解調技術於所提出的濾波器陣列接收器上，相較於傳統的可見光通訊系統架構，所能提供的效能改善。在可見光通訊系統中應用分波長多工技術(Wavelength Division Multiplexing, WDM)達成多使用者環境已經被提出，而由於傳統的VLC是利用光電二極體作為可見光通訊接收器，是無法分辨出不同的輸入光譜，因為存在這項缺陷所以很難達到運用分波長多工技術去接收不同波長的輸入訊號。
因此提出濾波器陣列接收器作為VLC接收端使用，並且透過軟體可重新配置的方式能達到運用分波長多工技術。模擬在環境中同時使用多個光源當作發射端傳輸資訊，對應到接收端上使用所提出的濾波器陣列接收器，因此將系統類比成MIMO系統，並利用MIMO訊號解調技術，將不同傳輸光源的光譜能清楚分辨出來。在模擬顯示我們能藉由低成本的濾波器陣列接收器來實現WDM技術，且透過演算法的改進能有效的提升系統效能。

關鍵字

濾波器陣列接收器 ； 可見光通訊 ； 分波長多工技術 ； 多輸入多輸出

並列摘要

This thesis aims to explore visible light communication (VLC) systems. We provide a multiple input multiple output (MIMO) signal detection techniques for filter array receivers in VLC systems to improve the performance. In VLC systems, the wavelength division multiplexing (WDM) techniques have been proposed to efficiently share the visible light bandwidth for users. However in conventionally VLC systems, photoelectric-diodes are implemented to convert optical signals into electronic signals. Since photoelectric-diodes cannot distinguish inputs of different spectra, it is difficult to achieve WDM for light sources of different wavelengths.
In this study, filter array receivers are proposed to be implemented on the receiver side to achieve WDM with software reconfigurable abilities. The proposed system can transmit data by using multiple light sources, and receiver data by multiple filters in the receiver side. Therefore, the system can be seen as a MIMO system. We use MIMO signal detection techniques to achieve WDM. The simulation results show that we can achieve effect WDM with good performance by applying low-cost filter array receivers.

並列關鍵字

Visible Light Communication ； Wavelength Divide Multiplexing ； Filter-array receiver ； Multiple Input Multiple Output

參考文獻

[24] C. Singh, J. John, Y.N. Singh, and K.K. Tripathi, "A review on indoor optical wireless systems," IETE Technical Review, vol. 19, no. 1, pp. 3-17, Jan. 2004.

[2] T. Komine, and M. Nakagawa, “Integrated system of white LED visible-light communication and power-line communication,” IEEE Transactions on Consumer Electronics, vol. 49, no. 1, pp. 71-79, June 2007.

[3] N. Lourenco, D. Terra, L. N. Alves, and R. L. Aguiar, “Visible light communications in intelligent transportation systems,” in Proceeding of 2012 IEEE Intelligent Vehicles Symposium, Alcala de Henares, Spain, pp. 748-753, June 3-7 2012.

[8] H. L. Minh, D. O’Brien, G. Faulkner, L. Zeng, K. Lee, D. Jung, Y. Oh, and E. T. Won, “100-Mb/s NRZ visible light communications using a postequalized white LED,” IEEE Photonics Technology Letters, vol. 21, no. 15, pp. 1063-1065, May 2009.

[10] T. Komine, and M. Nakagawa, “Fundamental analysis for visible-light communication system using LED lights,” IEEE Transactions on Consumer Electronics, vol. 50, no. 1, pp. 100-107, June 2004.