| Summary: | 博士 === 國立清華大學 === 電機工程學系 === 89 === In orthogonal frequency division multiplexing (OFDM) systems,
a loss of the subchannel orthogonality due to the time-varying multipath fading leads to interchannel interference (ICI).
In this study, we address the ICI suppression for multicarrier
detection with less noise enhancement by using a parallel canceling scheme of the frequency-domain equalization technique.
In this technique, the equalization of the received OFDM signal is achieved by using the assumption that the channel impulse
response (CIR) varies in a linear fashion during a block period.
In order to avoid performance deterioration due to unreliable initial estimation in the parallel cancellation scheme,
a cost function with proper weighting of the design criterion
is introduced to improve the performance of the proposed equalizer. The proposed equalizer consists of a prefilter and an ICI cancellation filter. Each filter performs different functions. The prefilter compensates the multiplicative distortion. The ICI cancellation filter is proposed to remove the effects of ICI by a parallel cancellation scheme. Finally, the performance of the proposed equalizer is analyzed and compared with that of other equalizers.
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