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主要是国外最新的PAPR的研究状况,涉及到OFDM技术中PAPR的降低以及OFDM系统组成部分对系统的影响。全部是英文文献
PAPR.rar
  • Nonlinear limits for high bit-rate O-OFDM systems.pdf
    412.8KB
  • PAPR Reduction Techniques for Coherent Optical OFDM Transmission.pdf
    359KB
  • Evaluation of Effects of MZM Nonlinearity on QAM and OFDM Signals in RoF Transmitter.pdf
    496.4KB
  • Experimental Demonstration of Compensating the I-Q Imbalance and.pdf
    629.4KB
  • Fiber Nonlinearity Mitigation by PAPR Reduction in Coherent Optical OFDM Systems via Active Constellation Extension.pdf
    426.4KB
内容介绍
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/6269800c0990925c04487429/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6269800c0990925c04487429/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">Experimental Demonstration of Compensating the I/Q Imbalance and </div><div class="t m0 x2 h2 y2 ff1 fs0 fc0 sc0 ls1 ws1">Bias Deviation of the Mach-Zehnder Modulator for an RF-Tone </div><div class="t m0 x3 h2 y3 ff1 fs0 fc0 sc0 ls1 ws2">Assisted Optical OFDM System </div><div class="t m0 x4 h3 y4 ff1 fs1 fc0 sc0 ls2 ws3">Wei-Ren Peng (1, 2), Bo Zhang (1), Xiao<span class="_ _0"></span>xia Wu (1), <span class="ls3 ws4">Kai-Ming Feng (3), Alan E. Willner (1) and Sien C<span class="_ _0"></span>hi (2) </span></div><div class="t m0 x5 h3 y5 ff1 fs1 fc0 sc0 ls4 ws5">1 : Department of Electrical Engineer<span class="_ _0"></span>ing, University<span class="ls5 ws6"> of Southern California, Los Ange<span class="_ _0"></span>les, CA 90089, USA <span class="_ _1"></span> <span class="ls6 ws7"> <span class="_ _1"></span> <span class="fc4 sc0"> </span></span></span></div><div class="t m0 x6 h3 y6 ff1 fs1 fc1 sc0 ls7 ws7">Tel:(213)740-1488</div><div class="t m0 x7 h3 y7 ff1 fs1 fc0 sc0 ls8 ws8">, Fax:(213)740-8729, E-mail: <span class="fc1 ls9 ws7">p<span class="_ _0"></span>wr.eo9<span class="_ _1"></span>2g@nctu.e<span class="_ _1"></span>du.tw<span class="fc0 lsa"> </span></span></div><div class="t m0 x8 h3 y8 ff1 fs1 fc0 sc0 lsb ws9">2 : Institute of Electro-Optical Engi<span class="ls5 ws6">neering, National Chiao Tung Univer<span class="lsc wsa">sity, Hsinchu, T<span class="_ _0"></span>aiwan 300, R.O.C. </span></span></div><div class="t m0 x8 h3 y9 ff1 fs1 fc0 sc0 lsa ws7">3<span class="ff2"> </span>:<span class="ff2"> </span><span class="lsd wsb">Institute of Communication<span class="lse wsc">s Engineering, National Tsing Hua Un<span class="lsb ws9">iversity, Hsinchu, Taiwan 300, R.O.C. </span></span></span></div><div class="t m0 x9 h3 ya ff1 fs1 fc0 sc0 lsa ws7"> </div><div class="t m0 x9 h3 yb ff2 fs1 fc0 sc0 lsf ws7">Abstract<span class="ff1 ls10 wsd"> We demonstrate a<span class="_ _0"></span>n equalization techniqu<span class="_ _0"></span>e to compensate for impairments induced b<span class="_ _0"></span>y dispersion as </span></div><div class="t m0 x9 h3 yc ff1 fs1 fc0 sc0 lse wse">well as I/Q imbalance and bias deviation in the MZM. T<span class="ls11 wsf">he proposed scheme <span class="ls10 ws10">has a 2 dB improv<span class="_ _0"></span><span class="lsb ws11">ement in back to </span></span></span></div><div class="t m0 x9 h3 yd ff1 fs1 fc0 sc0 ls12 ws12">back and a 4 dB gain after 800 km SSM<span class="lsd wsb">F transmission with I/Q imbalance. </span></div><div class="t m0 x9 h3 ye ff1 fs1 fc0 sc0 lsa ws7"> </div><div class="t m0 x9 h3 yf ff2 fs1 fc0 sc0 ls13 ws7">Introduction<span class="ff1 lsa"> </span></div><div class="t m0 x9 h3 y10 ff1 fs1 fc0 sc0 ls10 ws13">Optical orthogonal-frequency-divis<span class="_ _0"></span>ion-multiplexin<span class="_ _0"></span>g </div><div class="t m0 x9 h3 y11 ff1 fs1 fc0 sc0 ls11 ws14">(OFDM) is a promising modul<span class="_ _0"></span>ation format for long </div><div class="t m0 x9 h3 y12 ff1 fs1 fc0 sc0 ls2 ws15">haul transmission due to it<span class="_ _0"></span>s robustness to fiber </div><div class="t m0 x9 h3 y13 ff1 fs1 fc0 sc0 ls2 ws16">chromatic dispersion (CD) and p<span class="_ _0"></span>olarization-mode-</div><div class="t m0 x9 h3 y14 ff1 fs1 fc0 sc0 ls14 ws17">dispersion (PMD) [1, 2]. The direct detection OFDM </div><div class="t m0 x9 h3 y15 ff1 fs1 fc0 sc0 ls15 ws18">requires only one photodi<span class="_ _0"></span>ode <span class="ls2 ws19">at the receiver and thus<span class="_ _0"></span> </span></div><div class="t m0 x9 h3 y16 ff1 fs1 fc0 sc0 ls3 ws1a">is easy and cost-effective to install and impl<span class="_ _0"></span>ement [1-</div><div class="t m0 x9 h3 y17 ff1 fs1 fc0 sc0 ls2 ws1b">4]. The recently proposed interleaved <span class="_ _0"></span>RF-tone-</div><div class="t m0 x9 h3 y18 ff1 fs1 fc0 sc0 ls5 ws1c">assisted direct-detection OF<span class="ls8 ws1d">DM (OFDM-B in [4]) is </span></div><div class="t m0 x9 h3 y19 ff1 fs1 fc0 sc0 ls2 ws1e">one of the promising formats due to its better </div><div class="t m0 x9 h3 y1a ff1 fs1 fc0 sc0 ls16 ws1f">sensitivity and robustness to the CD comp<span class="_ _0"></span>ared to the </div><div class="t m0 x9 h3 y1b ff1 fs1 fc0 sc0 ls17 ws20">conventional power-modulated OFDM system [4]. </div><div class="t m0 x4 h3 y1c ff1 fs1 fc0 sc0 ls4 ws21">Similar to other optical systems, the OFDM </div><div class="t m0 x9 h3 y1d ff1 fs1 fc0 sc0 ls2 ws22">performance critically depends on the proper </div><div class="t m0 x9 h3 y1e ff1 fs1 fc0 sc0 ls4 ws23">operation of the Mach-Zeh<span class="_ _0"></span>nder modulator (MZM). </div><div class="t m0 x9 h3 y1f ff1 fs1 fc0 sc0 ls18 ws24">Any I/Q imb<span class="_ _1"></span>alance, w<span class="_ _1"></span>hich includ<span class="_ _1"></span>es the amp<span class="_ _1"></span>litude </div><div class="t m0 x9 h3 y20 ff1 fs1 fc0 sc0 ls5 ws25">imbalance, ph<span class="ls19 ws26">ase deviation bet<span class="_ _0"></span>ween I/Q arms, bias </span></div><div class="t m0 x9 h3 y21 ff1 fs1 fc0 sc0 ls19 ws27">deviations and time misalignment between the I/Q </div><div class="t m0 x9 h3 y22 ff1 fs1 fc0 sc0 ls3 ws28">arms, will degrade the channel performance. Thus, </div><div class="t m0 x9 h3 y23 ff1 fs1 fc0 sc0 ls3 ws29">careful control and precise monitori<span class="_ _0"></span>ng circuit for the </div><div class="t m0 x9 h3 y24 ff1 fs1 fc0 sc0 ls3 ws2a">MZM is required. However, it is possi<span class="_ _0"></span>ble to relax the<span class="_ _0"></span> </div><div class="t m0 x9 h3 y25 ff1 fs1 fc0 sc0 ls3 ws2b">requirements for the transmitter&#8217;s MZM monitoring<span class="_ _0"></span> </div><div class="t m0 x9 h3 y26 ff1 fs1 fc0 sc0 ls3 ws2c">and control circuit if the <span class="lsb ws2d">im<span class="_ _0"></span>pact of I/Q imbalance can </span></div><div class="t m0 x9 h3 y27 ff1 fs1 fc0 sc0 ls1a ws2e">be compensated by receiver-side digit<span class="_ _0"></span>al signal </div><div class="t m0 x9 h3 y28 ff1 fs1 fc0 sc0 ls5 ws6">processing (DSP). </div><div class="t m0 x4 h3 y29 ff1 fs1 fc0 sc0 lsa ws2f">There exists many receiver-side I/Q imbalance </div><div class="t m0 x9 h3 y2a ff1 fs1 fc0 sc0 ls4 ws30">equalization schemes in <span class="_ _0"></span>wireless communication [5]. </div><div class="t m0 x9 h3 y2b ff1 fs1 fc0 sc0 ls2 ws31">Unfortunately, these techniqu<span class="ls8 ws32">es tend to be difficult to<span class="_ _0"></span> </span></div><div class="t m0 x9 h3 y2c ff1 fs1 fc0 sc0 ls10 ws33">use on direct detection optical OFDM due to the </div><div class="t m0 x9 h3 y2d ff1 fs1 fc0 sc0 ls10 ws34">square-law nature of the <span class="ls2 ws35">photod<span class="_ _0"></span>iode. Therefore, a </span></div><div class="t m0 x9 h3 y2e ff1 fs1 fc0 sc0 ls16 ws36">laudable goal for direct-detection optic<span class="_ _0"></span>al OFDM would </div><div class="t m0 x9 h3 y2f ff1 fs1 fc0 sc0 ls2 ws37">be to compensate for both I<span class="_ _0"></span>/Q imbalance and linear<span class="_ _0"></span> </div><div class="t m0 x9 h3 y30 ff1 fs1 fc0 sc0 ls3 ws4">channel impairments. </div><div class="t m0 x4 h3 y31 ff1 fs1 fc0 sc0 ls16 ws38">In this paper, we experimentally demonst<span class="_ _0"></span>rate a </div><div class="t m0 x9 h3 y32 ff1 fs1 fc0 sc0 ls2 ws39">receiver-side compensation techni<span class="_ _0"></span>que for an </div><div class="t m0 x9 h3 y33 ff1 fs1 fc0 sc0 ls11 ws3a">interleaved RF-tone-assisted direct-detecti<span class="_ _0"></span>on OFDM </div><div class="t m0 x9 h3 y34 ff1 fs1 fc0 sc0 ls16 ws3b">system [4]. The received data is equalized <span class="_ _0"></span>by a 2x2 </div><div class="t m0 x9 h3 y35 ff1 fs1 fc0 sc0 ls8 ws3c">matrix which can effectively cancel out the MZM </div><div class="t m0 x9 h3 y36 ff1 fs1 fc0 sc0 ls8 ws3d">imbalance effects. We test the performance of an 8-</div><div class="t m0 x9 h3 y37 ff1 fs1 fc0 sc0 ls2 ws3e">QAM, 10-Gbps signal by deliberately addi<span class="_ _0"></span>ng </div><div class="t m0 x9 h3 y38 ff1 fs1 fc0 sc0 ls1b ws3f">amplitude imbalance, phas<span class="_ _0"></span>e deviation, bias deviation,<span class="_ _0"></span> </div><div class="t m0 x9 h3 y39 ff1 fs1 fc0 sc0 ls2 ws40">and time misalignment. The proposed method </div><div class="t m0 x9 h3 y3a ff1 fs1 fc0 sc0 ls16 ws41">demonstrates good performance over a <span class="_ _0"></span>wide range of </div><div class="t m0 xa h3 y3b ff1 fs1 fc0 sc0 lse ws42">I/Q imbalance and bias deviation. After 800 km of </div><div class="t m0 xa h3 y3c ff1 fs1 fc0 sc0 ls16 ws43">uncompensated standar<span class="_ _0"></span>d single mode fiber (SSMF) </div><div class="t m0 xa h3 y3d ff1 fs1 fc0 sc0 ls1a ws44">transmission, the proposed method <span class="_ _0"></span>can jointly </div><div class="t m0 xa h3 y3e ff1 fs1 fc0 sc0 ls16 ws45">compensate the added MZM imbal<span class="_ _0"></span>ance and the fiber<span class="_ _0"></span> </div><div class="t m0 xa h3 y3f ff1 fs1 fc0 sc0 ls2 ws46">CD, and outperforms the previous one-tap </div><div class="t m0 xa h3 y40 ff1 fs1 fc0 sc0 ls1a ws47">equalization method by 4 dB. </div><div class="t m0 xa h4 y41 ff2 fs2 fc0 sc0 ls14 ws48"> (a) </div><div class="t m0 xa h4 y42 ff2 fs2 fc0 sc0 ls10 ws7">(b) </div><div class="t m0 xa h5 y43 ff3 fs1 fc0 sc0 ls1b ws49">Figure 1 (a) The MZM imbalance <span class="_ _0"></span>and bias deviation<span class="_ _0"></span>, </div><div class="t m0 xa h5 y44 ff3 fs1 fc0 sc0 ls1c ws4a">and the corresposnding out<span class="_ _0"></span>put spectrum of the RF-</div><div class="t m0 xa h5 y45 ff3 fs1 fc0 sc0 ls12 ws4b">tone assisted OFDM [4], <span class="ls1d ws4c">(b) the interfered signals </span></div><div class="t m0 xa h5 y46 ff3 fs1 fc0 sc0 ls1b ws4d">after photodiode an<span class="_ _0"></span>d the proposed 2x2 e<span class="_ _0"></span>qualization </div><div class="t m0 xa h5 y47 ff3 fs1 fc0 sc0 ls3 ws4">matrix compensating the imba<span class="_ _0"></span>lance effects. </div><div class="t m0 xa h3 y48 ff2 fs1 fc0 sc0 ls2 ws3">Concept and experimental setu<span class="_ _0"></span>p<span class="ff1 lsa ws7"> </span></div><div class="t m0 xa h3 y49 ff1 fs1 fc0 sc0 ls7 ws4e">The MZM imbalance and compensation co<span class="_ _0"></span>ncept is </div><div class="t m0 xa h3 y4a ff1 fs1 fc0 sc0 ls11 ws4f">illustrated in Fig. 1. Fig. 1(a) shows the general MZM </div><div class="t m0 xa h3 y4b ff1 fs1 fc0 sc0 ls1d ws50">imbalances, which inclu<span class="_ _0"></span>des the amplitude unbalanc<span class="_ _0"></span>e, </div><div class="t m0 xa h3 y4c ff1 fs1 fc0 sc0 ls1a ws51">phase and bias deviation, and time misalig<span class="_ _0"></span>nment. The </div><div class="t m0 xa h3 y4d ff1 fs1 fc0 sc0 ls2 ws52">MZM I/Q imbalance induces a mirrored R<span class="_ _0"></span>F tone B </div><div class="t m0 xa h3 y4e ff1 fs1 fc0 sc0 ls1a ws53">and a mirrored interfer<span class="_ _0"></span>ence [5]<span class="ff2 fc2 lsa ws7"> <span class="_ _2"> </span></span><span class="ls8 ws54">which correlates the </span></div><div class="t m0 xa h3 y4f ff1 fs1 fc0 sc0 ls16 ws55">positive and negative sub-carr<span class="_ _0"></span><span class="ls8 ws56">iers. On the other hand, </span></div><div class="t m0 xa h3 y50 ff1 fs1 fc0 sc0 ls10 ws57">the bias deviation induces <span class="_ _0"></span>a tone C at DC since some </div><div class="t m0 xa h3 y51 ff1 fs1 fc0 sc0 ls4 ws58">power of the optical carrier passes through directl<span class="_ _0"></span>y. </div><div class="c xb y52 w2 h6"><div class="t m0 x0 h7 y53 ff4 fs2 fc0 sc0 lsa ws7">Mo.4.D.3</div></div><div class="c xc y54 w3 h6"><div class="t m0 x0 h7 y53 ff5 fs2 fc0 sc0 lsa ws7">Vol. 1 - 103</div></div><div class="c xd y55 w4 h8"><div class="t m0 x0 h9 y56 ff6 fs3 fc0 sc0 lsa ws7">ECOC 2008, 21-25 September 2008, Brussels, Belgium</div></div><div class="t m0 xe ha y57 ff7 fs4 fc0 sc0 ls1e ws59">1</div><div class="t m0 xf hb y58 ff8 fs1 fc3 sc0 lsa ws7">978-1-4244-2228-9/08/$25.00 (c) 2008 IEEE</div><div class="t m0 x10 hc y59 ff9 fs5 fc0 sc0 lsa ws7">Authorized licensed use limited to: TIANJIN UNIVERSITY OF TECHNOLOGY. Downloaded on November 18, 2009 at 01:50 from IEEE Xplore. Restrictions apply. </div></div><div class="pi" data-data='{"ctm":[1.611639,0.000000,0.000000,1.611639,0.000000,0.000000]}'></div></div> </body> </html>
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