| Summary: | 碩士 === 國立交通大學 === 電信工程系 === 89 === In a discrete multitone（DMT） receiver, a time-domain equalizer（TEQ） is usually used to shorten the channel response. However, the existing TEQ design methods often decrease the signal to noise ratio (SNR) resulting in a lower transmission rate. In recent years, some researchers have noticed this problem and proposed methods to alleviate this problem. However, these methods are either heuristic or their assumptions are not realistic. The reason for the SNR reduction (due to channel shortening) and the optimal way to solve the problem still remain unknown. In this thesis, we intend to investigate these problems. We first derive the mathematical relationship between the TEQ coefficients and SNR, and show how the TEQ reduces the SNR. Then, we propose a novel algorithm than can simultaneously shorten the channel response and achieve the maximum transmission rate. Simulations show that our algorithm outperforms all existing TEQ design methods.
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