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Channel Estimation and Crosstalk Cancellation in Broadband Access Network

Author: LeDaWei
Tutor: LiYouMing
School: Ningbo University
Course: Communication and Information System
Keywords: Access network Channel estimation Crosstalk CYCLOSTATIONARY
CLC: TN915.6
Type: Master's thesis
Year: 2011
Downloads: 49
Quote: 1
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Abstract


Multimedia and Internet and other new business is developing rapidly, requiring low-cost, high-quality broadband solutions. Closest to the user's access network infrastructure network as required to support images, data, voice and other types of business. Therefore, the broadband access network is the inevitable trend of development. Digital Subscriber Line DSL (Digital Subscriber Line) is a growing broadband access technology, which is the use of more advanced digital coding techniques and modem technology in the conventional copper twisted pair transmission user wideband signal. DSL technology is developing rapidly, and a large market share, is the current mainstream broadband access technology. DSL systems in order to guarantee a reliable signal transmission and reception, using a greater amount of signal processing. Channel estimation and crosstalk suppression is the access network, two key technologies, but also the reliable operation of DSL systems are necessary to solve the primary problem. Since these two technologies are closely related, therefore, this paper divided into two parts respectively DSL access network channel estimation techniques and crosstalk suppression technology to study, sum up, the main work and innovations include: (a), introduced the topic research background and significance, DSL system channel model, summed up the domestic channel estimation and Crosstalk Suppression Technology Research. (Two), broadband access networks in order to eliminate crosstalk, must first be accurate channel estimation, due to crosstalk special environment, based on the traditional MIMO channel estimation technique difficult to use, and largely based on traditional methods pilot technology, this article will cycle stationary signal processing technology into the access network, the realization of its users fading channel crosstalk blind channel estimation, channel estimation is accurate and easy to implement. (Three), introduced the traditional crosstalk suppression method compared the uplink and downlink transmit their similarities and differences, analysis of several typical crosstalk suppression algorithm, pointing out the advantages and disadvantages of various algorithms. (Four), based on the current most of the crosstalk suppression techniques are non-adaptive, and achieve more complicated, this paper introduces the adaptive signal processing techniques DSL systems, solve DSL crosstalk suppression system. Including time-domain adaptive crosstalk suppression, frequency domain adaptive crosstalk suppression, in which crosstalk suppression of frequency-domain adaptive uplink and downlink transmission in two, we study the different characteristics of each algorithm. Adaptive signal processing method makes it easier to implement crosstalk suppression.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication network > Access network
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