»ùÓÚlmsË㷨ʱÓò¾ùºâÆ÷µÄÉè¼Æ£¨ÖÕ£© ±¾¿Æ±ÏÒµÂÛÎÄ ÏÂÔØ±¾ÎÄ

н®´óѧ¿ÆÑ§¼¼ÊõѧԺ±ÏÒµÂÛÎÄ£¨Éè¼Æ£©

н®´óѧ¿ÆÑ§¼¼ÊõѧԺ

College of science £¦ technology Xinjiang University

Ìâ Ä¿£º»ùÓÚ

Ö¸µ¼½Ìʦ:

ѧÉúÐÕÃû£º×¨ Òµ£º°à ¼¶£ºÍê³ÉÈÕÆÚ£ºÑ§Éú±ÏÒµÂÛÎÄ(Éè¼Æ)

LMSËã·¨µÄʱÓò¾ùºâÆ÷µÄÉè¼Æ¼°·ÂÕæ

ͨÐŹ¤³Ì

ͨÐÅ08-1°à

2012 Äê 05 ÔÂ 20 ÈÕ

н®´óѧ¿ÆÑ§¼¼ÊõѧԺ±ÏÒµÂÛÎÄ£¨Éè¼Æ£©

Éù Ã÷

Ö£ÖØÉùÃ÷£¬´ËÂÛÎÄ£¨Éè¼Æ£©ÊDZ¾ÈËÔÚÖÓÐãæµÀÏʦָµ¼ÏÂÍê³É£¬Ã»Óг­Ï®¡¢ØâÇÔËûÈ˳ɹû£¬·ñÔò£¬ÓÉ´ËÔì³ÉµÄÒ»Çкó¹ûÓɱ¾È˸ºÔð¡£

±¾ÈËÇ©Ãû£º

н®´óѧ¿ÆÑ§¼¼ÊõѧԺ±ÏÒµÂÛÎÄ£¨Éè¼Æ£©

Õª Òª

±¾ÎĽéÉÜÁË×ÔÊÊÓ¦¾ùºâÆ÷µÄ·¢Õ¹ÀúÊ·£¬·ÖÎöÁËÐŵÀ£¬²úÉúÂë¼ä¸ÉÈŵÄÔ­ÒòÒÔ¼°ÎÞÂë¼ä¸ÉÈŵÄÌõ¼þ£» ²ûÊöÁËʱÓò¾ùºâÆ÷µÄ¹¤×÷Ô­Àí£¬½éÉÜÁËÈçºÎÓÃÓÐÏÞ³¤ºáÏòÂ˲¨Æ÷À´ÊµÏÖʱÓò¾ùºâµÄЧ¹û£»²ûÊöÁËlmsËã·¨µÄÔ­Àí£»×îºó½áºÏʱÓò¾ùºâÆ÷µÄÔ­ÀíÒÔ¼°lmsËã·¨Ô­ÀíÔÚmatlabÖÐÉè¼ÆÁËÀíÏëЧ¹ûµÄ¾ùºâÆ÷£¬²¢Í¨¹ý±ä²½³¤£¬¶ÔËùÉè¼ÆµÄ¾ùºâÆ÷Ч¹û½øÐÐÅжϡ£½á¹û±íÃ÷£º1.²½³¤ÎªÔ½³¤Ê±£¬¾ùºâÆ÷ÔÚÊÕÁ²Ô½¿ì£»µ«²½³¤Ô½´ó£¬ ¾ùºâÆ÷ÊÕÁ²Ð§¹û²»ºÃ£¬²½³¤Ô½¶Ìʱ£¬¾ùºâÆ÷ÊÕÁ²Ô½Âý£¬µ«ÊÕÁ²Ð§¹û½ÏºÃ£»

¹Ø¼ü´Ê£ºÊ±Óò¾ùºâÆ÷£»lmsËã·¨£»matlab·ÂÕæ

ABSTRACT

This paper introduces the development history of the adaptive equalizer, analyzes the channel, produce the isi reason and no interference between conditions; Describes the working principle of the time-domain equalizer, and introduced how to use limited long horizontal filter to achieve the effect of time domain equilibrium; Expounds the principle of LMS algorithm; The last time the principle of combining the equalizer and LMS algorithm of the matlab design principle in the ideal effect equalizer, and through the variable step long, the design of equalizer effect judgment. The results show that: 1. Step of the long, equalizer in the faster convergence; But step length, the bigger the equalizer convergence result is bad, the longer the short-term, equalizer convergence more slow, but convergence effect is better;

Key ward£ºtime-domain equalizer; lms-algorithm; matlab-simulation

н®´óѧ¿ÆÑ§¼¼ÊõѧԺ±ÏÒµÂÛÎÄ£¨Éè¼Æ£©

Ŀ¼

1Ð÷ÂÛ .......................................................................... 1

1.1 ¿ÎÌâÑо¿µÄÒâÒå .......................................................... 1 1.2 ¾ùºâÆ÷·¢Õ¹¼°Ñо¿×´¿ö .................................................... 1 1.3 ¾ùºâ¼¼Êõ¼ò½é ............................................................ 2 1.4ÐŵÀ¡¢Âë¼ä¸ÉÈÅ .......................................................... 2

1.4.1ÐŵÀ .............................................................. 2 1.4.2Âë¼ä¸ÉÈÅ .......................................................... 3 1.5 ±¾ÂÛÎĵÄÖ÷ÒªÑо¿ÄÚÈÝ .................................................... 3 2.ʱÓò¾ùºâÆ÷µÄÔ­Àí .............................................................. 4

2.1ʱÓò¾ùºâÆ÷¸ÅÀ¨ .......................................................... 4 2.2ʱÓò¾ùºâÆ÷µÄ¹¤×÷Ô­Àí..................................................... 4 2.3ÓÐÏÞ³¤ºáÏòÂ˲¨Æ÷......................................................... 6 3 LMS Ëã·¨ ...................................................................... 8

3.1 LMSËã·¨Ô­Àí ............................................................ 8 3.2 LMSË㷨ʵÏÖ ........................................................... 11 4×ÔÊÊÓ¦¾ùºâÆ÷ÔÚmatlabµÄ·ÂÕæ ................................................... 12

4.1matlab½éÉÜ ............................................................. 12 4.2×ÔÊÊÓ¦¾ùºâÆ÷ÔÚmatlabÖеÄʵÏÖ ........................................... 12 ½á ÂÛ .......................................................................... 17 Ö л .......................................................................... 18 ²Î¿¼ÎÄÏ× ....................................................................... 19