隨著WiMAX的成熟發展，其應用與服務也急速增加，但在大樓內無線電波常受到阻隔，而影響到接收訊號的品質，為有效提高覆蓋率，使用無線上載於光網(Radio over Fiber, RoF)技術克服WiMAX訊號穿透性及覆蓋率不足的問題。本論文主要針對WiMAX穿透性及覆蓋率等問題，在校園中建置WiMAX基地台，實際量測並證實大樓內訊號品質嚴重不足等現象，利用理論分析設計出RoF的模擬平台提供參考。在實驗驗證方面，本論文使用不同波長不同種類的光源對系統所需要的重要光電元件，如放大器、檢光器與光纖等，設計合適於各種不同應用的架構，進行驗證理論的分析結果，所需元件模組將以可市場取得的為主。研發出低成本的大樓內WiMAX訊號上載光纖的設備解決方案，並可適用於下個世代寬頻傳輸技術上。
在此設計架構下，本論文大幅了改善WiMAX訊號覆蓋率不足的問題。在點對多點(1x16)的情況下，上下行傳輸頻寬5 MHz於頻段2.665 GHz WiMAX訊號在64-QAM的EVM標準下覆蓋率均可以達到17 m，而在點對點(1x1)的情況下，最佳可以達到25 m。

Due to rapid evolution of the WiMAX (World Interoperability for Microwave Access) technology, its applications and services have been increased dramatically. However, the radio wave within the building is usually blocked and the received signal quality is greatly deteriorated. In order to increase the signal coverage, theirs investigates the radio over fiber (RoF) technology to overcome the coverage problem of WiMAX. We measured the radio signal from the WiMAX base station, in NTUST campus and found out that the signal quality is poor inside the building. We develop a theoretical model for the design of a RoF analog link. In the experiments, we investigate the performance of RoF transmission with different optical sources of different wavelengths. In combination with the components, such as amplifiers, optical detectors, we design different link architectures for different applications by using the commercial available components. The goal is to develop low-cost solutions for transmitting WiMAX signals over fiber, which is promising for realizing next generation broadband wireless system.
On design clearly improves the WiMAX signal coverage. For point to multi-point(1x16) system, Our design can achieve 5 MHz bandwidth for 64-QAM WiMAX data of 2.665 GHz carrier frequency for both downstream and upstream transmission. The wireless coverage is can reach 17 m, the coverage can reach 25 m in point to point for transmission.

[1] C. Lim, A. Nirmalathas, M. Bakaul, P. Gamage, K. L. Lee, Y. Yang, D. Novak, and R. Waterhouse, “Fiber-Wireless Networks and Subsystem Technologies,” Journal of Lightwave Technology. vol. 28, pp. 390-405, 2010.
[2] E. Frank, C. David, H. Onn, K. Glen, L. Ruo Ding, O. Moshe, and P. Thomas, “An introduction to PON technologies,” IEEE Communication Magazine, pp. S17-S25, 2007.
[3] J. Hu, D. Qian, T. Wang, and M. Cvijetic, “Wireless Intermediate Frequency Signal over Passive Optical Networks: Architecture and Experimental Performance Evaluation,” National Fiber Optic Engineers Conference, paper NThD4, 2008.
[4] W. S. C. Chang, “RF Photonic Technology in Optical Fiber Links,” Cam- bridge, U.K.: Cambridge Univ. Press, pp. 422, 2002.
[5] 林淑娟, 高速直調雷射之傳輸性能改善及運用於WDM-PONs系統之研究, 博士論文,台灣科技大學, 民國97年.
[6] 朱泓龍, WiMAX引爆數位家庭網路商機, 2006年.
[7] 郭南宏, 雙向WiMAX上載分波多工被動光纖網路設計, 碩士論文,台灣科技大學, 民國98年.
[8] N. Chayat, “Proposal for an OFDM-based 802.16 BWA Air Interface Physical Layer,” IEEE 802.16 Broadband Wireless Access Working Group, 1999.
[9] J. E. Mitchell, “Performance of OFDM at 5.8 GHz Using Radio over Fibre Link,” Electronics Letters, vol. 40, no. 21, pp. 1353-1354, 2004.
[10] J. G. Andrews, A. Ghosh, and R. Muhamed, Fundamentals of WiMAX: Understanding Broadband Wireless Networking, Pearson Education, ch.2 and ch.8 pp.2-10~2-13 and 8-14, 2007.
[11] H. Sari, G. Karam, and I. Jeanclaude, “Transmission Techniques for Digital Terrestrial TV Broadcasting,” IEEE Communications Magazine, 1995.
[12] D. Qian, N. Cvijetic, J. Hu, and T. Wang, “Optical OFDM Transmission in Metro/Access Networks,” Optical Fiber Communication and the National Fiber Optic Engineers Conference, paper OMV1, Mar 2009.
[13] R. V. Nee , and R. Prasad, “OFDM for Wireless Multimedia Communications,” Artech House, ch.2, pp.33-36, 2000.
[14] T. D. Chiueh, and P. Y. Tsai, “OFDM Baseband Receiver Design for Wireless Communications,” Wiley, ch.9, pp. 9.1-9.5, 2007.
[15] R. Van Nee and R. Parasad, “OFDM for wireless multimedia communication,” Artech House, Boston, 2000.
[16] L. Hanzo, W. Webb, and T. Keller, “Single- and Multi-Carrier Quadrature Amplitude Modulation,” Wiley, Chichester, 2nd edition, 2000.
[17] A. Goldsmith, “Wireless Communications,” Cambridge University Press, Stanford University, 1st edition edition, 2005.
[18] K. Chinen, “RCE Measurements in RoF of WiMAX with DFB-LDs,” Opto-Electronics and Communications Conference, pp. 1-2, July 2008.
[19] S. Forestier, P. Bouysse, R. Quere, A. Mallet, J. Nebus, and L. Lapierre, “Joint optimization of the power-aided efficiency and error vector measurement of 20-GHz pHEMT amplifier through a new dynamic biascontrol method”. IEEE Transactions on Microwave Theory and Techniques, vol.52(no.4):pp.1132–1140, Apr. 2004.
[20] M. D. McKinley, K. A. Remley, M. Mylinski, J. S. Kenney, D. Schreurs, and B. Nauwelaers, “EVM Calculation for Broadband Modulated Signals,” Technical Report, 2005. Work of United States Goverment.
[21] IEEE, IEEE Standard 802.11b-1999. IEEE Standard for Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications:High Speed Physical Layer Extension in the 2.4GHz Band.
[22] IEEE, IEEE Standard 802.11a-1999. IEEE Standard for Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: High Speed Physical Layer in the 5GHz Band.
[23] A. R. Islam, M. S. Rahman, R. A. Shafik, “On the extended relationships among EVM, BER and SNR as performance metrics,” Proc. 4th Int. Conf. Electr. Comput, Eng, pp. 408-411, 2006.
[24] 鄭孝威, “Investigation of single mode fiber Fabry-Perot Interferometer and its characteristics in DWDM system,” 碩士論文, 國立中央大學, 民國90年。
[25] 葛育坤, “The Study of Diode Laser Frequency-Stabilized top High Fabry-Perot Cavity,” 碩士論文, 逢甲大學, 民國90年。
[26] T. Makino, “Transfer-Matrix Formulation of Spontaneous Emission Noise of DFB Sermconductor,” Lightwave Technology, vol. 9, no. I, 1991.
[27] K. H. Y. Jarkko, and A. B. Grudinin, “Performance Limitations of High-Power DFB Fiber Lasers,” Photonics Letters, vol. 15, no. 2, 2003.
[28] J. H. Choi, L. Wang, H. Bi, and R. T. Chen, “Thermal-Via Structures on Thin-Film VCSELs for Fully Embedded Board-Level Optical Interconnection System,” Journal of Selected Topics in Quantum Eleectronics, vol. 12, no. 5, 2006.
[29] J. J. Liu, K. A. Olver, M. T. Lara, T. Taylor, W. Chang, and S. Horst, “High-Yield Flip-Chip Bonding and Packaging of Low-Threshold VCSEL Arrays on Sapphire Substrates,” Transactions on and Packaging Technologies, vol. 26, no. 3, 2003.
[30] R. Lin, “Next Generation PON in Emerging Networks,” Optical Fiber communication/National Fiber Optic Engineers Conference, paper OWH1, 2008.
[31] L. Guennec, Y.Pizzinat, A. M. Sylvain, “Low-Cost Transparent Radio Over Fiber System for In-Building Distribution of UWB Signals,” Journal of Lightwave Technology, vol. 27, pp. 2649-2657, 2009.
[32] C. L. Yao, H. C. Wang, Y. J. Hung, S. L. Lee, and J. L. Jeng, “Novel Tunable Laser Sources with Cascaded DFB Reflectors for Multi-Gas Sensor Application,” Opto-Electronics and Communication Conference, paper 7B1-4, 2006.
[33] C. P. Liu, T. Ismail, and A. J. Seeds, “Broadband Access Using Wireless-over-Fibre Technologies,” BT Technology Journal, vol. 24, no. 3, pp. 130-143, Jul. 2006.
[34] M. J. Crisp, S. Li, A. Watts, R. V. Penty, and I. H. White, “Uplink and Downlink Coverage Improvements of 802.11g Signals Using a Distributed Antenna Network”, Journal of Lightwave Technology, vol. 25, no. 11, pp. 1-8, Nov. 2007.
[35] M. Sauer, A. Kobyakov, and J. George, “Radio over Fiber for Picocellular Network Architectures”, Journal of Lightwave Technology, vol. 25, no. 11, pp. 3301-3320, Nov. 2007.
[36] Z. Jia, J. Yu, A. Chowdhury, G. Ellinas, and G. K. Chang, “Simultaneous Generation of Independent Wired and Wireless Services Using a Single Modulator in Millimeter-Wave-Band Radio-over-Fiber Systems,” IEEE Photonics Technology Letters, vol. 19, no. 20, pp. 1691-1693, 2007.
[37] T. Kurt, A. Yongacoglu, and J. Y. Chouinard, “OFDM and Externally Modulated Multi-Mode Fibers in Radio over Fiber Systems,” Wireless communications, IEEE, vol. 5, no. 10, pp. 2669-2674, 2006.
[38] C. Almeida, A.Teixeira, and M. Lima, “Performance Analysis of Multi-Format Multi-Wavelength Radio over Fiber Systems Based on Low Cost Optical Components,” International Conference on Transparent Optical Networks, vol. 4, pp. 106-109, 2008.
[39] J. B. Song and A. H. M. R. Islam, “Distortion of OFDM Signals on Radio-Over-Fiber Links Integrated With an RF Amplifier and Active/Passive Electroabsorption Modulators,” Journal of Lightwave Technology, vol. 26, no. 5, pp. 467-477, 2008.
[40] C. T. Lin, Y. M. Lin, J. Chen, S. P. Dai, P. C. Peng, P. T. Shih and S. Chi, “Generation of Direct-Detection Optical OFDM Signal for Radio-over-Fiber Link Using Frequency Doubling Scheme with Carrier Suppression,” Optical Fiber Communication and the National Fiber Optic Engineers Conference, paper OMM5, 2008.
[41] C. H. Cox III, E. I. Ackerman, G. E. Betts, and J. L. Prince, “Limits on the Performance of RF-Over-Fiber Links and Their Impact on Device Design,” IEEE Transactions on Microwave Theory and Techniques, vol. 54, no. 2, pp. 906-920, 2006.
[42] J. E. Mitchell, “Performance of OFDM at 5.8 GHz Using Radio over Fibre Link,” Electronics Letters, vol. 40, no. 21, pp. 1353-1354, Oct. 2004.