正交分頻多工(OFDM)傳輸方式已廣泛的使用於寬頻無線通訊上，例如歐規DVB-T 數位電視廣播系統。OFDM 系統通道估測可藉由傳送已知的訊號，讓接收端可以很快利用已知的符元輔助(Pilot Tones)估測通道，對於DVB-T 數位電視廣播系統而言，通道估測是利用已知的雜散領航訊號(Scattered Pilots)對通道頻率響應取樣，再透過內插方式得到全部通道響應。 本論文研究DVB-T 系統通道估測方法，包括一維(1D)通道估測方式和二維(2D)通道估測方式，不同的內插方式對於通道估測性能的影響，並研究在殘餘同步誤差的情況之下，不同的通道估測方式對於系統性能的影響。最後本論文設計一個DVB-T 通道估測模組，利用VHDL 設計其通道估測的模組。 The OFDM technology is now widely used in broadband wireless communications, such as the DVB-T system. The channel estimation of the OFDM system is based on the priori signals and the receiver can fast estimate the channel response by using the known pilot tones. The DVB-T system estimates the channel by scattered pilots and uses the estimated samples to interpolate the total frequency response. This thesis investigates various algorithms for channel estimation. It includes the comparison of 1D and 2D channel estimations, the effect of different interpolation methods on channel estimation and the difference of the system performance for different channel estimation methods when the system has residual synchronization errors. At the end of the thesis, a DVB-T channel estimation module is designed and implemented with the use of VHDL.
