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陈青辉答辩公告
浏览次数:日期:2018-05-18编辑:研究生教务办1

                            答辩公告

论文题目

高频谱效率光OFDM通信系统中数字信号处理算法的研究

答辩人

陈青辉

指导教师

何晶 副教授

答辩委员会

主席

王春华 教授

学科专业

计算机科学与技术

学院

信息科学与工程学院

答辩地点

信息科学与工程学院 203会议室

答辩时间

2018年5月24日

上午10:00

学位论文简介

如何在OFDM通信系统中进一步提升频谱效率,改善接收机的性能与降低系统的实现复杂度,是本文的研究重点。本文基于光纤和可见光的短距离强度调制直接检测通信系统,对于具有高频谱效率的光OFDM通信系统中的数字信号处理算法进行了研究。本论文的主要研究内容和创新点如下:

(1)提出一种基于直接调制激光器、FFT长度有效、4096 QAM调制的高频谱效率直接检测光OFDM(DDO-OFDM)系统。相比传统基于Hermitian对称方式产生实数OFDM信号的方法,基于FFT长度有效的方法可在相同数据子载波的前提下减少FFT/IFFT点数,可节省片上55%的资源开销,从而在很大程度上降低DSP芯片的功耗。此外,采用基于符号内频域平均的信道估计算法以获得准确的信道响应估计值,使用直接调制激光器降低光纤传输系统的成本。

(2)提出一种采用离散傅里叶变换(Discrete Fourier Transmission, DFT)扩频技术与FFT长度有效相结合的方法改善高频谱效率的自适应调制光OFDM系统的传输性能。分别在光纤激光可见光融合系统与激光可见光通信系统中进行了实验验证。

(3)提出一种基于正交循环矩阵变换(Orthogonal Circulant Matrix Transform, OCT)预编码和预增强的联合预处理算法,以克服可见光通信系统中OFDM信号子载波上不平坦的功率衰减效应。在基于发光二极管(Lighting Emitting Diode, LED)的可见光系统中进行了实验研究。

(4)使用基于判决辅助的采样时钟频偏补偿(SCFOC)算法对可见光OFDM系统中采样时钟频率偏差进行高效补偿。

主要学术成果

[1]Qinghui Chen, Jing He, Rui Deng, Ming Chen, and Lin Chen. FFT-Size Efficient 4096-QAM OFDM for Low-Cost DML-Based IMDD System. IEEE Photonics Journal, 2016, 8(5): 7804010 (SCI,第一作者)

[2]Qinghui Chen, Jing He, Rui Deng, Ming Chen, Fangliu Zhang, Min Dai, Fengting Long, and Lin Chen. Experimental Research on Adaptive 128 / 64QAM DFT-Spread IFFT / FFT Size Efficient OFDM With a High SE in VLLC System, IEEE Photonics Journal, 2017, 9(1):7900408 (SCI,第一作者)

[3]Qinghui Chen, Jing He, Rui Deng, Ming Chen, Fangliu Zhang, Min Dai, Fengting Long, and Lin Chen. Performance Investigation of the FFT/IFFT Size Efficient DFT-Spread-OFDM Signals in Hybrid Fiber-VLLC Systems. In: 15th International Conference on Optical Communications and Networks ICOCN 2016. Hangzhou, China, 2016.9.24-27 (国际会议,EI收录,第一作者)

[4]Qinghui Chen, Jing He, Rui Deng, Ming Chen, Zhihua Zhou, Jie Ma, Jin Shi, and Shuang-ao Liu. Performance enhancement of OFDM-VLC system using joint preprocessing scheme, IEEE Photonics Technology Letters,2018 (Under review,第一作者)

[5]Qinghui Chen, Jing He, Rui Deng, Ming Chen, Zhihua Zhou, Jie Ma, Jin Shi, and Shuang-ao Liu, and Jing He, Decision-aided sampling frequency offset compensation scheme for OFDM-VLC system, 2018 (Prepared,第一作者)

[6]Ming Chen, Xin Xiao, Z. Rena. Huang, Jianjun Yu, Fan Li, Qinghui Chen, and Lin Chen, Experimental Demonstration of an FFT Size Efficient DFT-spread OFDM for Short Reach Optical Transmission Systems, IEEE/OSA Journal of Lightwave Technology, 2016, 34(9): 2100-2105 (SCI)

[7]Lin Chen, Rui Deng, Jing He, Qinghui Chen, Yi Liu, and Changqing Xiang. W-Band Vector Signal Generation by Photonic Frequency Quadrupling and Balanced Pre-Coding. IEEE Photonics Technology Letters, 2016, 28(17): 1807-1810 (SCI)

[8]Rui Deng, Jing He, Qinghui Chen, Ming Chen, Yi Liu, Jun Liu, *Lin Chen. A serial IFFT precoding scheme to mitigate the periodic noise in OFDM system. IEEE Communications Letters, 2016, 20(7): 1301-1304 (SCI)

[9]Ming Chen, Jing He, Rui Deng, Qinghui Chen, Jinlong Zhang, Lin Chen. Demonstration of 2.97-Gb/s video signal transmissions in DML-based IM-DDO-OFDM systems. Optical Fiber Technology, 2016, 29: 90-94 (SCI)

[10]Fangliu Zhang, Jing He, Rui Deng, Qinghui Chen, Lin Chen. Performance improvement by orthogonal pulse amplitude modulation and discrete multitone modulation signals in hybrid fiber-visible laser light communication system. Optical Engineering, 2016, 55(10): 106106-1-5 (SCI)

[11]Jing He, Min Dai, Rui Deng, Qinghui Chen, and Lin Chen. An Adaptive LDPC Code Rate Algorithm Combined With DFT-spread For Multiband UWB over Fiber System. In: Proc of Advanced Photonics Congress (SPPCom) 2016. SpM2E.4.pdf, Vancouver, Canada, 2016.7.18-20

[12]Jing He, Fengting Long, Rui Deng, Qinghui Chen, Lin Chen. A joint channel estimation scheme for multiband OFDM UWB over fiber system. In: Proc of Advanced Photonics Congress (SPPCom) 2016. SpM2E.5.pdf, Vancouver, Canada, 2016.7.18-20

[13]Ming Chen, Qinghui Chen, Rui Deng, Hui Zhou, Zhiwei Zheng, Jing He, and Lin Chen, Self-Cancellation of Sampling Frequency Offset in Adaptively Modulated IMDD-OFDM Systems. In:Asia Communications and Photonics Conference 2016, Wuhan, 2016, p.ATH2D.2 (SCI)

[14]Jing He, Min Dai, Qinghui Chen, Rui Deng, Changqing Xiang, and Lin Chen, A software reconfigurable optical multiband UWB system utilizing a bit-loading combined with adaptive LDPC code rate scheme, Optical Fiber Technology, 2017, 36: 387–393 (SCI)

[15]Ming Chen, Qinghui Chen, Hui Zhou, Zhiwei Zheng, Jing He, and Lin Chen, Low-Complexity Receiver Using Undersampling for Guard-Band SSB-DDO-OFDM, IEEE Photonics Journal, 2017, 9(4):7203012 (SCI)

[16]Shuang-ao Liu, Jing He, Qinghui Chen, Rui Deng, Zhihua Zhou, Shenghai Chen, and Lin Chen, Experimental research of adaptive OFDM and OCT precoding with a high SE for VLLC system, Opical Fiber Technology, 2017, 37(2017):21-25 (SCI)

[17]Ming Chen, Hui Zhou, Zhiwei Zheng, Rui Deng, Qinghui Chen, Miao Peng, CuiWei Liu, Jing He, Lin Chen and XiongGui Tang, OLT-centralized sampling frequency offset compensation scheme for OFDM-PON, Optics Express, 2017, 25(16):19508-19516 (SCI)

[18]Zhihua Zhou, Jing He, Rui Deng, Qinghui Chen and Lin Chen, A DCT-spread FOFDM Signal with Low PAPR in W-band RoF System. In: International Topical Meeting on Microwave Photonics (MWP) 2017, Bejing, Oct. 2017

[19]Jie Ma, Jing He, Qinghui Chen, Jin Shi, Zhihua Zhou, Yun Cheng and Yaoqiang Xiao, A MB-CAZAC precoding combined with 128/64/32/16-QAM modulation for OFDM-VLC system. Optics Communications, 2018, 424(2018):154-158 (SCI)

[20]Siyi Dong, Jing He, Ming Chen, Qinghui Chen, Rui Deng, Jie Ma and Lin Chen, Performance improvement of ACO-OFDM system using OCT precoding combined with digital peak-clipping. CLEO Pacific Rim 2018, 2018, accepted.

[21]Jing He, Kaiquan Wu, Qinghui Chen, Jin Shi, Yiran Wei and Rui Deng, A spectral efficiency 128-QAM OFDM-VLC system aided by polar code, Optics Express, 2018 (Under review )