近年來物聯網快速發展，第五代行動通訊需要支持大量連接的用戶和設備，對於移動式網路(mobile Internet)的需求不斷上升，OFDM的傳輸速率漸漸地無法滿足第五代行動通訊的應用。因此，為了滿足這些要求，使用非正交多重接取(NOMA)來解決5G要面對的挑戰。
本篇論文中，透過非正交的資源分配容納更多的用戶，並採用功率復用的訊號傳輸方式，在功率域上做用戶訊號的疊加，與正交多址技術(OMA)相比，頻譜效益(Spectral Efficiency)和吞吐量(throughput rate)提高許多。
在非正交多重接取的情境下，接收端採用連續干擾消除法(Successive Interference Cancellation, SIC)，利用功率的不同解調不同用戶的訊號，但由於某些通訊情況無法滿足大、小功率用戶維持在特定功率比，遂加入圖形索引調變(Pattern-Index Modulation)，藉由關閉不同數量的子載波來增加適合操作功率比的範圍，並增加頻譜使用效益。
在本篇論文中提出NOMA with Pattern-Index Modulation作用在光載射頻(Radio over Fiber)整合上行毫米波通訊系統的應用場景，並在第四章中展示實驗結果。相較於傳統的索引調變，NOMA with Pattern-Index Modulation有著增加SIC適合操作的功率比、增加頻譜使用效益和減輕用戶間干擾的優勢。

In recent years, the Internet of Things has developed rapidly. The fifth generation of mobile communications needs to support a large number of connected users and devices. The demand for mobile Internet is rising. The transmission rate of OFDM has gradually been unable to meet the applications of the fifth generation of mobile communications. Therefore, in order to meet these requirements, non-orthogonal multiple access (NOMA) is used to solve the challenges faced by 5G.
In this paper, more users are accommodated through non-orthogonal resource allocation, and the signal transmission method of power multiplexing is adopted to superimpose user signals in the power domain. Compared with orthogonal multiple access technology (OMA), Spectral efficiency and throughput have improved a lot.
In the context of non-orthogonal multiple access, the receiving end uses Successive Interference Cancellation (SIC) to demodulate the signals of different users with different powers. However, due to certain communication conditions, it cannot meet the requirements of high and low power users. To maintain a specific power ratio, pattern-index modulation is added to increase the range of suitable operating power ratios by silent different numbers of subcarriers and increase the spectral efficiency.
In this paper, we propose the application scenario of NOMA with pattern-index modulation in the Radio over Fiber integrated uplink millimeter wave communication system, and show the experimental results in Chapter 4. Compared with traditional index modulation, NOMA with pattern-index modulation has the advantages of increasing the power ratio of SIC suitable for operation, increasing the spectral efficiency and reducing interference between users.

[1] M.Series. (2015). Recommendation ITU-R M.2083-0, IMT Vision - Framework and overall objectives of the future development of IMT for 2020 and beyond. In International Telecommunication Union, Role of IMT for 2020 and beyond, pp.16.
[2] What does 5G mean for critical comms? (2019, Nov. 11). Retrieved Sep. 11, 2021, from https://www.criticalcomms.com/features/critical-comms-5g-embb-urllc-massive-iot.
[3] 5G URLLC自駕車網路解決方案. Retrieved Sep. 11, 2021, from
https://www.gigabyte.com/tw/Solutions/Networking/urllc
[4] Y. Huang, S. Li, Y. T. Hou, and W. Lou, "GPF: A GPU-based Design to Achieve," in Proceedings of the 24th Annual International Conference on Mobile Computing and Networking, pp. 207-222, Oct. 2018.
[5] Z.Collin, Narrowband PLC and the power line medium (2012, Feb.). Retrieved Sep. 11, 2021, from https://www.eetimes.com/narrowband-plc-and-the-power-line-medium/
[6] Orthogonal Frequency Division Modulation (OFDM). Retrieved Sep. 11, 2021, from
https://www.csie.ntu.edu.tw/~hsinmu/courses/_media/wn_11fall/ofdm_new.pdf
[7] Keysight Technologies. (2018). Concepts of Orthogonal Frequency Division Multiplexing (OFDM) and 802.11 WLAN. Retrieved Sep. 11, 2021, from rfmw.em.keysight.com/wieless/helpfiles/89600b/webhelp/subsystems/wlan-ofdm content/ofdm_basicprinciplesoverview.htm
[8] FDMA、TDMA與CDMA通訊技術徹底研究, Retrieved Sep. 11, 2021, from https://www.csie.ntu.edu.tw/~b6506031/ExpReport/intro_1.html.
[9] L. Dai et al., "Non-Orthogonal Multiple Access for 5G: Solutions, Challenges, Opportunities, and Future Research Trends ," IEEE Communications Magazine, vol. 53, no.1, pp. 74-81, Sep. 2015.
[10] F. Boccardi et al., "Five Disruptive Technology Directions for 5G, " IEEE Communications Magazine, vol. 52, no. 2, pp. 74–80, Feb. 2014.
[11] S. R. Islam et al., "Power-domain non-orthogonal multiple access (NOMA) in 5G systems: Potentials and challenges," IEEE Communications Surveys & Tutorials, vol. 19, no. 2, pp. 721-742, Oct. 2017.
[12] L. Dai et al., "Non-orthogonal multiple access for 5G: solutions, challenges, opportunities, and future research trends," IEEE Communications Magazine, vol. 53, no. 9, pp. 74-81, Sep. 2015.
[13] L. Lei, "From Orthogonal to Non-orthogonal Multiple Access: Energy-and Spectrum-Efficient Resource Allocation," pp. 10, Linköping University Electronic Press, 2016.
[14] Y. Zhao and S.-G. J. I. T. o. C. Haggman, "Intercarrier interference self-cancellation scheme for OFDM mobile communication systems," IEEE Transactions on Communications, vol. 49, no.7, pp. 1185-1191, Jul. 2001.
[15] E. Başar, Ü. Aygölü, E. Panayırcı, H. V. Poor, "Orthogonal Frequency Division Multiplexing With Index Modulation," IEEE Transactions on Signal Processing, vol. 61, no. 22, pp. 5536-5549, Nov. 15, Nov. 2013.
[16] T. Tang et al., "Proposal and Demonstration of Subcarrier Index Modulation OFDM for RoF System With Enhanced Spectral Efficiency," Journal of Lightwave Technology, vol. 36, no. 19, pp. 4501-4506, Oct. 2018.
[17] S. Abhijith Nambi and K. Giridhar, "Lower Order Modulation Aided BER Reduction in OFDM with Index Modulation," IEEE Communications Letters, vol. 22, no. 8, pp. 1596-1599, Aug. 2018.
[18] S. Abhijith Nambi and K. Giridhar, "Modified CI and Modulation Order Replacement for Enhancing OFDM-IM Performance," IEEE Journal of Selected Topics in Signal Processing, vol. 13, no. 6, pp. 1286-1300, Oct. 2019.
[19] J. Zyren and W. McCoy, Overview of the 3GPP Long Term Evolution Physical Layer (2007, Jul.), pp. 15. Retrieved Sep. 11, 2021, from https://www.nxp.com/docs/en/white-paper/3GPPEVOLUTIONWP.pdf
[20] E. Basar et al., "Index Modulation Techniques for Next-Generation Wireless Networks," IEEE Access, vol. 5, pp. 16693-16746, Aug. 2017.
[21] A. R. Arnold and S. M. Piscitelli, "TPMS Receiver Hacking," pp. 31, 2015.
[22] P. J. Winzer and R. Essiambre, "Advanced Optical Modulation Formats," Proceedings of the IEEE, vol. 94, no. 5, pp. 952-985, Jun. 2006.
[23] R. G. Hunsperger, Integrated Optics (2009).
[24]干涉(物理學). Retrieved Sep. 11, 2021, from https://zh.wikipedia.org/wiki/%E5%B9%B2%E6%B6%89_(%E7%89%A9%E7%90%86%E5%AD%A6)
[25] W. Shieh and C. J. E. l. Athaudage, "Coherent optical orthogonal frequency division multiplexing," Electronics Letters, vol. 42, no. 10, pp. 587-589, 2006.
[26] A. J. Lowery and J. J. O. E. Armstrong, "Orthogonal-frequency-division multiplexing for dispersion compensation of long-haul optical systems," Optical Society of America, vol. 14, no. 6, pp. 2079-2084, 2006.
[27] A. J. J. O. E. Lowery, "Amplified-spontaneous noise limit of optical OFDM lightwave systems," Optical Society of America, vol. 16, no. 2, pp. 860-865, 2008.
[28] K. Higuchi and A. Benjebbour, "Non-orthogonal multiple access (NOMA) with successive interference cancellation for future radio access," IEICE Transactions on Communication, vol. E98-B, no. 3, pp. 403-414, Mar 2015.
[29] J. Zyren and W. McCoy, Overview of the 3GPP Long Term Evolution Physical Layer (2007, Jul.), pp. 15. Retrieved Sep. 11, 2021, from https://www.nxp.com/docs/en/white-paper/3GPPEVOLUTIONWP.pdf
[30] Yun Zhang, Jinze Li, Yang Li, and Nan Qiao," Radar Detection Based on Pilot Signals of LTE Base Stations," Wireless and Satellite Systems, pp 755-765, 07 May 2019.
[31] H. Al-Raweshidy and S. Komaki, Radio over fiber technologies for mobile communications networks. Artech House (2002).
[32] C. Lim et al., "Fiber-Wireless Networks and Subsystem Technologies, " Journal of Lightwave Technology, vol. 28, no. 4, pp. 390-405, Feb.15, 2010
[33] C. Lim, Y. Yang, and A. Nirmalathas, "Transport schemes for fiber-wireless technology: Transmission performance and energy efficiency," Photonics, vol. 1, no. 2, pp. 67-82: Multidisciplinary Digital Publishing Institute, 2014.
[34] H. J. E. L. Schmuck, "Comparison of optical millimetre-wave system concepts
with regard to chromatic dispersion," vol. 31, no. 21, pp. 1848-1848, 1995.