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Design of Time-Domain Equalizer in Elastic Wave Earth Channel

Wen-hong LV(吕文红), Fu-bin ZHANG(张福斌),Ping-xiang JIANG(姜平香)

 

(College of Information and Electronical Engineering, Shandong University of science and technology, Qingdao 266510, China)

 

Abstract-In low-frequency elastic wave through-the-earth communication system, because of multipath transmission caused by characteristics of the layered earth, the time domain equalizer is different from other wireless communication systems. A modified LMS algorithm of variable step size is proposed based on improvement of traditional LMS. On the base of principle and simulation analysis, the improved Least Mean Square(LMS) algorithm is analyzed and the performances are compared between the improved LMS algorithm and traditional LMS algorithm. In the improved algorithm, the contradiction between convergence speed and the steady-state error is considered at the same time. Therefore, the improved algorithm has good convergence properties and channel-tracking performance.

 

Key words-Inter-Symbol Interference (ISI); adaptive equalization; stratum channel; through-the-earth communication system

 

Manuscript Number: 1674-8042(2011)04-0353-05

 

doi: 10.3969/j.issn.1674-8042.2011.04.012

 

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