节点文献

短波数字通信中的自适应均衡技术的研究

The Research of Adaptive Equalizer in Shot-Wave Communication

【作者】 李红宇

【导师】 王大寿;

【作者基本信息】 大连海事大学 , 电路与系统, 2002, 硕士

【摘要】 短波多年来广泛应用在各种通信领域中,但是其传输过程中,由于多径效应引起的码间干扰,经常导致误码接收,使传输质量下降。用自适应均衡技术消除码间干扰是目前常用的方法,也是各国学者和研究人员的热门话题。随着通信技术的不断发展,目前接收机中的均衡器越来越多的采用自适应均衡器。为了满足高速数据传输的要求,具备在严重畸变信道上有较好的抗噪声性能,可采用非线性均衡器。短波数传信号的响应变动速度很快,这就对均衡器提出更高的要求:无论是最小相位还是非最小相位的情况都能处理以及跟踪性能要好。 本文对均衡器的各种结构和算法进行了比较详细的讨论和分析,对各种均衡器的特性作了比较。这些分析和比较对实际应用有一定的指导作用。提出了一种RLS结合型均衡算法,说明了算法的可行性,并且对其特性和传统RLS算法进行了比较和分析。然后把一种新型判决反馈均衡算法SEWRLS应用在判决反馈均衡器中,由于SEWRLS算法性能优良,此处把它和判决反馈均衡器结合,使两者的性能都有很大的改善;最后对一种盲均衡算法进行了讨论,对其抽头系数的变化规律作了比较和分析。经比较这三种均衡器都可应用在短波通信中。

【Abstract】 Shot-wave can be used in many fields of the communication. But the intersymbol interference(ISI) caused by multipath causes bit errors at the receiver. ISI has been recognized as the major obstacle to high speed data transmission over shotwave channels. Now Equalization is a very effective technique used to combat intersymbol interference. With the development of the communication, now the equalizer in the receiver is often the adaptive equalizer. In order to adapt to high speed data transportation, we often use the nonlinear adaptive equalizer. The faster the date respond changes the better character and convergence speed the equalizer should have.This paper analysis and discuss the structures and the algorithms of the equalizer. Compare the characteristics of the different equalizer. Hereproposes a new adaptive equalization algorithm----the combined RLSalgorithm. According to the mixed sliding exponential window recursive squares(SEWRLS) algorithm, proposes an adaptive decision equalizer (ADFE). And at last, simulate a new constant modulus blind equalization algorithm with adaptive adjusting the dispersion constant is proposed in this contribution.

【关键词】 码间干扰均衡器RLSSEWRLS
【Key words】 ISIequalizerRLSSEWRLSADFE
  • 【分类号】TN925.93
  • 【被引频次】2
  • 【下载频次】351
节点文献中: 

本文链接的文献网络图示:

本文的引文网络