Proc. IEEE Asilomar Conf. on Signals, Systems, and Computers,
Nov. 7-10, 2004, pp. 2056-2060, Pacific Grove, California, invited paper.
Effect of Channel Estimation Error on Bit Rate
Performance of Time Domain Equalizers
Brian L. Evans, and
Department of Electrical and Computer Engineering,
Engineering Science Building,
The University of Texas at Austin,
Austin, TX 78712-1084 USA
ADSL Research at UT Austin
Channel equalization plays a key role in achieving high bit rates in
wireline multicarrier systems.
Some VDSL systems and all standardized multicarrier ADSL systems employ
time domain equalization (channel shortening) and frequency domain
equalization in channel equalization.
In this paper, we analyze the impact of imperfect channel estimates on the
bit rate performance of four time domain equalization methods.
We derive a closed-form expression for the bit rate loss due to channel
We simulate the sensitivity in bit rate performance using first-generation
downstream ADSL transmission.
In simulation, the minimum intersymbol interference and minimum mean
square error methods are relatively insensitive to channel estimation
errors vs. minimum delay spread and maximum shortening signal-to-noise
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