頻率偏移調變,又稱頻率鍵移(FSK,Frequency-Shift Keying )是一種利用頻率差異的訊號來傳送資料的調變方式。最常見的FSK為二進制FSK(BFSK,binary FSK,或稱2FSK)。BFSK用兩個離散的頻率分別代表不同的二進制訊號(0和1),四進制頻移鍵控則稱QFSK。[1]
其中,為頻帶寬度,為原始信號帶寬
中心載頻
調製
解調
可分為同調解調(Coherent Demodulation)與非同調解調(Noncoherent Demodulation)兩種。前者需要估計載波之相位,後者則否。
注釋
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