| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 103 === In fast time-varying channel, the orthogonal frequency division multiplexing (OFDM) system suffers from inter-subchannel interference (ICI). The problem of ICI also occurs in the single-carrier block transmission (SCBT) with frequency-domain equalization (FDE) system. Many algorithms of ICI reduction have been proposed for the OFDM system. Some of these algorithms are also suitable for the SC-FDE system. However, the effect of residual ICI becomes severe when the SNR increases. We need to estimate the variance of residual ICI in the FD equalization with the minimum mean-squares error (MMSE) principle. Moreover, an inaccurate estimate of the variance of residual ICI leads to ICI enhancement in the associated FD equalization.
In the thesis, we consider an ICI self-reduction algorithm for the SC-FDE system. In order to prevent the enhancement of residual ICI after the ICI self-reduction, we apply the K-Best algorithm in detection to search for the near maximum-likelihood (ML) solution. With the detection based on k-best algorithm, we need not to estimate the variance of residual ICI and this can avoid the residual ICI enhancement. The simulation results validate our method.
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