- 6 3 Synchronous Detection Fsk Signal Multiplier Tuneable Lpf Decision Maker Scope Selector Clk Ind Oute Ac Tune Fsk Sig 1 (43.19 KiB) Viewed 18 times
- 6 3 Synchronous Detection Fsk Signal Multiplier Tuneable Lpf Decision Maker Scope Selector Clk Ind Oute Ac Tune Fsk Sig 2 (37.79 KiB) Viewed 18 times
Explain theoretically, how does the demodulation shown in Fig. 6.8 function. Use Eq. (6.1)
in your explanation
6.3: Synchronous Detection FSK Signal MULTIPLIER TUNEABLE LPF DECISION MAKER SCOPE SELECTOR CLK IND OUTE AC TUNE FSK Signal DECHHION POINT CH 1 х -TRIG- va Z-MOD GAIN NOAM WIDE IN1 OUT Carrier O KXY IN OUT B.CLK B.CLK CH 2 Bit Clock from SEQUENCE GENERATOR SYNC from SEQUENCE GENERATOR Fig. 6.8 Synchronous Demodulation of FSK Connection Diagram
Where is the BW of the baseband signal and Af=-fo)/2. If we take to be the first null BW for the polar signal, then B = bit rate (R). Thus: BW = 2(A S + R) Carrier 1 1 0 1 0 0 0 1 0 1 Binary signal FSK AMO lifo fi So lo so i to fi Fig. 6.1 Frequency Shift Keying Signal