| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 94 === Abstract
In 2002, FCC decided to release 3.6~10.1 GHz spectrum for commercial use, and this indicates that future communication systems is of wideband and high transmission rate. However, for high data rate transmission the multipath channel results in time dispersive phenomenon and causes each symbol interfered by lots of symbols several time periods ago. For such intersymbol interference (ISI), or frequency-selective fading, the system needs complex time-domain equalization (TDE), for which the number of tap coefficients increases with the channel delay spread, and conventional time-domain equalization (TDE) may be of high complexity since the necessary number of tap coefficients increases with the channel delay spread. In this thesis, to avoid the complex time-domain equalization in the multipath channel, we first study the single-carrier block transmission with frequency-domain equalization (FDE). Similar to the orthogonal frequency-division multiplexing (OFDM) transmission, frequency-domain equalization has lower complexity than time-domain equalization. The SC block transmission also avoids the problem of high peak to average power ratio (PAPR) that occurs in OFDM transmission. We further consider SC block transmission with space time block coding (STBC), in which we study how to use permutation on the data sequences of the two antennas such that the receiver could have low-complexity data detection. Practical channel estimation based on a least square fitting (LSF) approach is also considered.
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