Design and Implementation of an Adaptive Decision Feedback qualizer for Wireless LAN
Date Issued
2004
Date
2004
Author(s)
Chen, Chien-Tsun
DOI
en-US
Abstract
With the growth of the communication technology and Local Area Network (LAN), communication quality has become more and more important. In digital communication systems, there are many factors that affect the communication quality. One of the main factor decreasing system performances is inter-symbol interference (ISI) which come from the multi-path effect. To eliminate the ISI problem, we use an equalizer to solve this problem. In order to achieve linearity and stability, we use a Least-Mean-Square (LMS) algorithm to implement the equalizer. And due to the speed issue and convergence of recovery, we use a decision feedback equalizer architecture for this design. It consists of four main parts: two FIR filters, a Feed-Forward filter and a Feed-Back filter, and a block of update coefficients, and a slicer. We implement this decision feedback equalizer (DFE) by using two 3-tap FIR filters. It can also train the signal to correct in 44 chips (about 4μs). In this design, we use the TSMC CMOS 0.35μm 2P4M process technology. The DFE consumes 53.99 mW with a 3.3V supply voltage.
Subjects
可適應性決策回授等化器
最小均方法
等化器
adaptive decision feeback equalizer
equalizer
LMS
Type
thesis
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