在本論文中，我們探討載波頻率偏移 (carrier frequency offset [CFO])對基於離散哈特利轉換 (discrete Hartley transform [DHT]) 之濾波器组多載波 (filter bank multicarrier [FBMC]) 系統的效能影響，並使用原先針對傳統正交分頻多工 (orthogonal frequency division multiplexing [OFDM]) 系統所提出之相位旋轉共軛消除技術 (phase-rotated conjugate cancellation [PRCC])，以克服DHT-FBMC系統的CFO問題；我們同時推導出PRCC的最佳相位旋轉角度，以最大化載波干擾比，並有效降低因CFO所造成的載波間干擾。電腦模擬結果顯示，在相同的CFO情況下，所提出之使用PRCC的DHT-FBMC系統較使用PRCC的傳統OFDM系統具有更好的位元錯誤率效能；此一效能改善隨著CFO的增大而亦趨明顯，且當正規化的CFO值等於0.3時，效能增益可達3 dB；另外，所提出之系統的效能對CFO估測誤差的反應不會太敏感，因此在實際應用中可不用頻繁地回授CFO估測值。

In this thesis, we first investigate the effects of carrier frequency offset (CFO) on a filter bank multicarrier (FBMC) system based on the discrete Hartley transform (DHT). We then use the phase-rotated conjugate cancellation (PRCC) technique, which was originally proposed for the conventional orthogonal frequency division multiplexing (OFDM) system, for the DHT-FBMC system to overcome the CFO problem. Subsequently, the optimal phase rotation is derived for PRCC such that the carrier-to-interference ratio is maximized for the system, where the intercarrier interference due to the CFO can be reduced effectively. Computer simulation results demonstrate that the proposed DHT-FBMC scheme using PRCC achieves better bit-error-rate (BER) performance than the conventional OFDM system using PRCC under the same CFO condition. The BER improvement becomes more significant as the CFO value increases, where the performance gain is up to 3 dB when the normalized CFO is equal to 0.3. Also, the performance of the proposed scheme is not sensitive to CFO estimation errors, and the feedback of CFO estimates would not be required frequently in practical applications.

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