在美規數位廣播中，已提出混合IBOC FM系統，此系統在FM頻帶兩旁同時傳送數位廣播訊號。由於IBOC FM標準尚未制定在FM頻帶內傳送數位訊號，且自我頻帶內干擾仍存在於數位訊號跟FM訊號之間，如果我們能使用FM訊號內的頻帶，我們就能提供更多的資料傳輸量。本論文提供了一個方法，可以同時傳送數位訊號及FM訊號在同一頻帶內，且彼此不互相干擾。

Hybrid In-Band On-Channel (IBOC) digital audio broadcasting (DAB) system, which conveys digital audio signals simultaneously with analog audio signals, has been proposed as a compatible solution to DAB system in the frequency modulation (FM) band. However, current hybrid systems defined in the IBOC FM DAB specification request to transmit the digital signals and the analog signals on nonoverlapped spectrum to avoid self-in-band interference. It is certain that if both signals can be transmitted on the same FM band, it can provide more transmission capacity for digital signals and can improve the spectrum efficiency. In this thesis, we propose a scheme that can transmit digital data and analog FM signals simultaneously in the same band without interfering with each other.

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