由於多載波調變方式能夠達到較大的頻寬效益，得到較高的資料傳輸率，因此近年來有些數位傳輸系統多採用多載波調變方式，而非傳統的單載波技術，例如在無線通訊方面的窄頻個人通訊服務(PCS)的應用,和多載波碼分多工(CDMA)；而在有線通訊方面的高速數位用戶迴路(HDSL)亦採多載波調變技術。 本論文乃考慮多載波調變信號在加成性高斯雜訊環境下，接收端已知各個載波頻率時，設計接收系統之濾波器模組，濾出各個單一載波訊號，供後續系統使用；載波數估側模組，考慮載波數目為一變化值，偵測多載波調變訊號之載波數；載波回復模組，回復載波因受雜訊、通道影響，產生的相位偏移，。此外藉由電腦模擬，了解系統效能，且提供系統中模組參數的設定。 本論文將提供接收系統之系統設計及完整的接收運作流程，並針對濾波器組、載波數估測、和載波回復的設計有詳盡的討論，並進行電腦模擬作效能的評估。 In the recent past, multi-tone modulation has generated a lot of research interest. Multi-tone Modulation superimposes several carrier- modulated waveforms in parallel subchannels in order to increase the data rate on a channel. Much of the research in this area has focused on providing maximal bandwidth efficiency and has therefore employed M-ary phase shift keying or quadrature amplitude modulation (MPSK and QAM, respectively) on the subcarriers. In this thesis, we discuss how to design a receiving system of multi-tone modulated signals when the carrier frequencies of received signals were known. We design the filter-bank module to filter the every single signal of multi-tone signal. It is necessary to ascertain much of carriers that multi-tone modulated signal have .So we design the carrier-number detection module in the receiving system to detect the carriers. Then we design the carrier recovery module to track the phase offset of single signal in the subchannels.
