60GHz ROF-OFDM系统的变编码技术性能研究
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摘要
本文提出采用变编码技术提高60GHz ROF-OFDM系统的传输性能。通过对60GHz毫米波OFDM信号在光纤传输中的色散效应进行理论分析,得到60GHz毫米波OFDM信号在传输过程中,随着传输带宽的增加以及传输距离的增长,OFDM信号的高频区域子载波会受到频率选择性衰减效应的影响,产生严重的幅度衰减,导致系统误码分布不均的情况出现。为了均衡误码分布,提高系统传输容量,我们提出将变编码技术应用于60GHz ROF-OFDM系统中。验证分析发现,在60GHz ROF-OFDM系统中使用变编码技术能够有效的提高ROF系统的接收灵敏度,增强系统的传输可靠性。并且在相同冗余度下,变编码技术比固定编码效率的Turbo编码性能更优。
In this paper, the adaptive code rate technique(ACT) is adopted and investigated in 60 GHz ROF-OFDM system. Firstly, we have theoretically analyzed that the existence of frequency selective fading(FF) in the 60 GHz ROF-OFDM system will cause an unbalanced bit error distribution and degrade the system performance. Then we propose to employ the adaptive code rate technique(ACT) in 60 GHz ROF-OFDM to combat FF. Simulation results show that the receiver sensitivity of the 60 GHz ROF-OFDM system employing ACT is improved significantly. And the results also shows that the signals employing ACT perfomance better performance compared with the signals employing fixed rate turbo code in the case of same length redundancy.
In this paper, the adaptive code rate technique(ACT) is adopted and investigated in 60 GHz ROF-OFDM system. Firstly, we have theoretically analyzed that the existence of frequency selective fading(FF) in the 60 GHz ROF-OFDM system will cause an unbalanced bit error distribution and degrade the system performance. Then we propose to employ the adaptive code rate technique(ACT) in 60 GHz ROF-OFDM to combat FF. Simulation results show that the receiver sensitivity of the 60 GHz ROF-OFDM system employing ACT is improved significantly. And the results also shows that the signals employing ACT perfomance better performance compared with the signals employing fixed rate turbo code in the case of same length redundancy.
引文
[1]Fang,W.J.,X.G.Huang,and G.Li,A full duplex radioover-fiber transmission of OFDM signals at 60GHz employing frequency quintupling optical up-conversion[J].Optics Communications,2013.294(0):118-122.
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[5]Elaine Wong,Next-Generation broadband access networks and technologies[J].Journal of Lightwave technology,201230(4):597-608
[6]William Shieh,OFDM for Flexible High-Speed Optical networks[J].Journal of Lightwave technology,2012 29(10):1560-1577
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[8]陈虹先,李凡,肖江南,曹子峥,余建军,陈罗湘,陈林,基于压扩变换的直接检测O-OFDM系统的实验研究,光电子激光,2011,22(7):1057-1060Chen Hong Xian,Chen Lin,Yu Jianjun,Xiao Jiangnan,Cao Zizheng,Li Fan,Experimental Investigation for60GHz Radio-Over-Fiber System Employing Orthogonal Frequency Division Multiplexing Format Based On Companding Transform[J].ACTA OPTICA SINICA,2011,22(7):1057-1060.(in Chinese)
[9]袁燕,秦毅,孙军强.基于级联马赫曾德电光调制器的60GHz光载毫米波传输系统的研究[J].光电子.激光,2011,(11):1646-1649.Yuan Yan,Qin Yi,Sun Junqiang,Research on a60GHz optical mm-wave over fiber sysem using two cascaded Mach-Zehnder modulators[J].Journal of Optoelectronics·Laser,2011,(11):1646-1649.(in Chinese)
[10]Tang,Q.Lin Chen,Jiangnan Xiao,and Zizheng Cao,Experiment on 60-GHz MMW transmission performance in an optical fiber andwireless system[J].Chin.Opt.Lett.,2011.9(5):050601.
[11]Cao,Z,Zou L Lin Chen and Jianjun Yu,Impairment Mitigation for a 60GHz OFDM Radio-Over-Fiber System Through an Adaptive Modulation Technique[J].Optical Communications and Networking,IEEE/OSA Journal of,2011.3(9):758-766.
[12]Zizheng,Cao,Jianjun Yu,Hui Zhou,Wenpei Wang,Minmin Xia,Jing Wang,Qi Tang and Lin Chen,WDMRo F-PON Architecture for Flexible Wireless and WireLine Layout[J].Optical Communications and Networking,IEEE/OSA Journal of,2010.2(2):117-121.
[13]Cao,Z,Jianjun Yu,Qi Tang,Guanjun Zeng and Lin Chen,Long-reach 60-GHz radio-over-fiber system based on turbo-coded OFDM[J].Chinese Optics Letters,2010.8(11):1024-1027.
[14]Xin Wang,Jianjun Yu,Zizheng Cao J.Xiao and Lin Chen,SSBI mitigation at 60GHz OFDM-ROF system based on optimization of training sequence[J].Opt.Express,2011.19(9):8839-8846.
[15]Li,F Yu,Jianjun;Xiao,Jiangnan;Cao,Zizheng and Chen,Lin,Reduction of frequency fading and imperfect frequency response with pre-emphasis technique in OFDM-ROF systems[J].Optics Communications,2011.284(19):4699-4705
[2]Chia-Chien,W,Chun-Ting Lin,Ming-I Chao and WenJr Jiang,Adaptively Modulated OFDM Ro F Signals at 60GHz Over Long-Reach 100-km Transmission Systems Employing Phase Noise Suppression[J].Photonics Technology Letters,2012.24(1):49-51.
[3]Wen-Jr,J.,Chun-Ting Lin,Anthony Ng’oma,PoTsung Shih,Jason(Jyehong)Chen,Michael Sauer,Frank Annunziata,and Sien Chi,Simple 14-Gb/s Short-Range Radio-Over-Fiber System Employing a Single-Electrode MZM for 60-GHz Wireless Applications[J].Journal of Lightwave Technology,2010.28(16):2238-2246.
[4]肖江南,陈林,余建军.基于LDPC-TCMOFDM的60GHz光载毫米波传输性能实验研究[J].光电子.激光,2012,(12),2333-2336.Xiao Jiang-nan,Chen Lin,Yu Jian-jun,Experiment study on 60GHz ROF millimeter wave transmission based on LDPC-TCM OFDM[J].Journal of Optoelectronics·Laser,2012,(12),2333-2336.(in Chinese)
[5]Elaine Wong,Next-Generation broadband access networks and technologies[J].Journal of Lightwave technology,201230(4):597-608
[6]William Shieh,OFDM for Flexible High-Speed Optical networks[J].Journal of Lightwave technology,2012 29(10):1560-1577
[7]Liang Chen,Brian Krongold and Jamie Evans,Performance analysis for optical OFDM transmission in short-range IM/DD systems[J].Journal of Lightwave technology,2012 30(7):974-983
[8]陈虹先,李凡,肖江南,曹子峥,余建军,陈罗湘,陈林,基于压扩变换的直接检测O-OFDM系统的实验研究,光电子激光,2011,22(7):1057-1060Chen Hong Xian,Chen Lin,Yu Jianjun,Xiao Jiangnan,Cao Zizheng,Li Fan,Experimental Investigation for60GHz Radio-Over-Fiber System Employing Orthogonal Frequency Division Multiplexing Format Based On Companding Transform[J].ACTA OPTICA SINICA,2011,22(7):1057-1060.(in Chinese)
[9]袁燕,秦毅,孙军强.基于级联马赫曾德电光调制器的60GHz光载毫米波传输系统的研究[J].光电子.激光,2011,(11):1646-1649.Yuan Yan,Qin Yi,Sun Junqiang,Research on a60GHz optical mm-wave over fiber sysem using two cascaded Mach-Zehnder modulators[J].Journal of Optoelectronics·Laser,2011,(11):1646-1649.(in Chinese)
[10]Tang,Q.Lin Chen,Jiangnan Xiao,and Zizheng Cao,Experiment on 60-GHz MMW transmission performance in an optical fiber andwireless system[J].Chin.Opt.Lett.,2011.9(5):050601.
[11]Cao,Z,Zou L Lin Chen and Jianjun Yu,Impairment Mitigation for a 60GHz OFDM Radio-Over-Fiber System Through an Adaptive Modulation Technique[J].Optical Communications and Networking,IEEE/OSA Journal of,2011.3(9):758-766.
[12]Zizheng,Cao,Jianjun Yu,Hui Zhou,Wenpei Wang,Minmin Xia,Jing Wang,Qi Tang and Lin Chen,WDMRo F-PON Architecture for Flexible Wireless and WireLine Layout[J].Optical Communications and Networking,IEEE/OSA Journal of,2010.2(2):117-121.
[13]Cao,Z,Jianjun Yu,Qi Tang,Guanjun Zeng and Lin Chen,Long-reach 60-GHz radio-over-fiber system based on turbo-coded OFDM[J].Chinese Optics Letters,2010.8(11):1024-1027.
[14]Xin Wang,Jianjun Yu,Zizheng Cao J.Xiao and Lin Chen,SSBI mitigation at 60GHz OFDM-ROF system based on optimization of training sequence[J].Opt.Express,2011.19(9):8839-8846.
[15]Li,F Yu,Jianjun;Xiao,Jiangnan;Cao,Zizheng and Chen,Lin,Reduction of frequency fading and imperfect frequency response with pre-emphasis technique in OFDM-ROF systems[J].Optics Communications,2011.284(19):4699-4705