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来自维基百科,自由的百科全书
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,或称2FSK)。BFSK用兩個離散的頻率分别代表不同的二進制訊號(0和1),四进制頻移鍵控则称QFSK。[1]
其中,为频帶宽度,为原始信号带宽
中心载频
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。
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