Digital communication receivers P2 - P2

Chia sẻ: Khinh Kha Kha | Ngày: | Loại File: PDF | Số trang:20

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Digital communication receivers P2 - P2

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Baseband Communications Y(b) Timing Error Detector 4 r(t; 8 ) - x(t) ) ,+) u(t) vco 4 Figure 2-18 Error-Tracking SynchronizerStructure The timing error detector performs a suitable time-invariant nonlinear operation on the input signal and the local reference,so that its output signal z(t) gives an indication of the instantaneous timing error e = & - g. The timing error detector output signal enters a linear time-invariant loop filter. Its frequency responsein the Laplace domain is denotedby F(s) ; the frequencyresponsein the frequency domain is F(w). The loop filter output signal u(t) determinesthe instantaneous frequency of the VCO accordingto (2-31) such that the timing error e is reduced....

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