Sep 18, 2017

AN FSK SIGNAL S(T) IS APPLIED TO A CORRELATION RECEIVER CIRCUIT THAT IS SHOWN IN FIG. P6–59. THE…

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An FSK signal s(t) is applied to a correlation receiver circuit that is shown in Fig. P6–59. The FSK signal is

where f1 = fc + ∆F and f2 = fc – ∆F. Let ∆F be chosen to satisfy the MSK condition, which is ∆F = 1/(4T). T is the time that it takes to send one bit, and the integrator is reset every T seconds. Assume that A = 1, fc = 1,000 Hz, and ∆F = 50 Hz.

(a) If a binary 1 is sent, plot v1(t), v2(t), and r0(t) over a T-second interval.

(b) Refer to Fig. 6–16, and find an expression that describes the output of a filter that is matched to the FSK signal when a binary 1 is sent. Plot the filter output.

(c) how the plots obtained for parts (a) and (b) agree or disagree.

Figure P6–59

Fig. 6–16


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