1、null 0 / 2011 M 2 Y / null收稿日期: 2011- 02- 08作者简介:郭建英( 1974null ),女,河南濮阳人,濮阳职业技术学院物理与机电工程系讲师,硕士研究生b c I | : 1674null4578( 2011) 02null0060null02OFDM关键技术及应用郭建英(濮阳职业技术学院,河南濮阳 457000)K null 1 :与传统单载波技术相比,正交频分复用( OFDM )技术具有频谱利用率高和抗频率选择性衰落能力强等优点,是提高系统传输速率和可靠性的有效手段,并且随着对 OFDM技术的研究逐渐完善和成熟, OFDM 技术已经得到广泛应用b在
2、此主要介绍了 OFDM 技术原理和关键技术,分析了 OFDM 技术的应用现状,展望了在下一代移动通信中的应用和研究方向b1 o M :正交频分复用; 峰值平均比; 信道估计; 同步 m s | : TN914null null D S M : A0null OFDM/ 4 X 40 M N 1 , M , 3 | ( DSP)/ f ? Z a = M /Q M a M odem/ / , OFDM/ T V r F ISI o . / T + ts . ( 1) B OFDM | = , 0 o M M ,i O c , 7 O M # 0 o W M 1 ,V 7 0 o W b l j
3、0 o H ,d!j =1T ts+Ttsexp(- j2null jT (t- ts)nullN- 1i= 0di exp(j2null iT (t- ts )dt =1T nullN- 1i= 0di ts+Ttsexp(j2nulli- jT (t- ts)dt = dj . ( 2) T V A , j 0 o V | ,7 0 o , s W q Y(i- j) /T V 3 , s T , b2null OFDM“ d 1 o / OFDM“ d i M 0 o ,7 O | 0 | F , OFDM“ d i / + Z 1 o / b2. 1null ( 1 / OFDM “
4、d B ( 1 1 bM o “ d , OFDM | 0 o | M F7 , N 0 OFDM“ d , T N | M M H , | q ( q N b M S v | Y V q bv d L q H , | ? 3 d L , 3 o , “ N , 9 F A /D, D /A 2, y N , h l v PAR OFDM “ d “ 1 5 B b“ - h l ( Z E V s : | M / , I / F OFDM | F ) 4 ( 1 l | . 3b , | M / | $ bv - , n 5 q v | d L M , 1 K a F 3 a h “ 4bI
5、 Z E P / v q | I m “ , Z E 0 o v H , I r q d b2. 2null 9 L Y “ d , ? l W . l , v , l | M a q b l ? 4 v G ,7 9 X B 5 1 F s bY V 9 , l V L Y V 7 l | ( b 9 E 1 : 9 E 9 E b , 9 E ? l X 9 , OFDM“ d H = , ; V H = 9 , 9 V = 9 b Z E L C , E e , b l 9 V B s Y ( ) % ( 6 ), n 5 H = 9 l , = 9 b3null OFDM/ “ - ,
6、 OFDM/ X . 5 b 3 1 g , 9a10 L C 1 g l ? b l b A U u , x p v i v A U b T ? u , 1 g v M f ,Y 1 g q | ? b S , 1 x p v v 4 M x pu % ? b 1 g v ? u , ? b3null pyGTK V y ! 9 e 1 g Y k q , i O t 7 ? , V Linux w indow s/ Y , + 1 S b| Y x p s ! 9 , P q ! z Z + , V p 9 F Y x p b s z , ! 9 ,i F , V ! 9 e S e q
7、bpython , M C q , 1 p V | python I r = T b I D 1null 姚文华,秦开宇,李志强.自动测试系统中异步串口通信的实现 J.电子质量, 2009, 12: 6- 8. 2null 美 W esley J. Chun. Python核心编程 M .第 2版.宋吉广,译.北京:人民邮电出版社, 2008. 3null 美 E ric Steven Raymond. TheA rt ofUn ix Programm ingM . Add isonnullW esley, 2003. 4null 李心成,孙殿柱.基于 Python和 GTK +与 VTK混合
8、编程及应用 J.山东大学学报 (工学版 ), 2009, 39( 6):78- 81. 5null 赵毅,马捷.利用 Python和 GTK+的 Linux GU I应用的快速开发 J.计算机工程, 2004, 30( 8): 80- 82. 6null 朱汉群,苏厚勤,吴丰科. L inux GU I开发工具 Gtk+技术应用研究 J.计算机应用与软件, 2009, 26( 1) : 137- 140.TheDevelopmentofMulti- protocolsSerialPortDebugSoftwareBasedon thepyGTKZhu H ongnulljuan1, Su Li
9、nulljun2, Chen Li1, Bai Jie1( 1.H ebeiProfessional College of PoliticalScience and Law, ShijiazhuangH ebei 050061, China;2. Shijiazhuang OrdnanceEngineering College, ShijiazhuangH ebei 050000, China)Abstract:A im ing at the defect that it can not resolve various communication protocolw ith serial po
10、rt debug too,l the paper develnullops a serial debugging software app licab le tom ultiple protocols by using som e open source software such as pyGTK, glade and etc. itnot on ly achieves m any comm on protocols, but also open the protocol interfaces that the user can expand protocols freely. Th is
11、softw areis already debugged, and the serialm on itoring softw are su itab le for engineering app lication can be fu rther developed based on it.Keywords: python; GTK+ ; glade; serial port; software(上接第 61页) 7 null ACX, Agu iar R L, Bauer F, et a.l Reference ScenarioSpecification: F inal Description
12、 J. European Comm isnullsion ISTnull2001null32620MATRICE Deliverab le D7. 1. 8 null Ben Lu, Xiaodong W ang. Spacenulltim e Code Design inOFDM system s J. Proc, 2000 IEEE Globecom Confernullence, San Francisco, CA, 2000, 11: 1000- 1005.TheKeyTechnologyandApplicationofOrthogonalFrequencyDivisionMultip
13、lexingGuo Jiannullying(Puyang Vocational and TechnicalCollege, PuyangH enan 457000, China)Abstract: Com pared to the cond itional single carrierm odu lation techn ique, orthogonal frequency division mu ltip lexing techniquecan overcom e the prob lem of sm all scale fad ing and has efficient utilizat
14、ion of spectrum. OFDM is used w idely and regarded as the effinullcient m ethod to im prove the transm iss ion in the system s. Th is paper introduces the basic princip le and the key technique ofOFDM, annullalyses the app lication in the 4G mob ile comm un ication.Keywords:OFDM; PAP; channel estimation; synchron ization67null 2 null null null null null null null null 朱红娟,等:基于 pyGTK的多协议串口调试软件的开发
