1) (15 points) Your receiver has synchronized with the received spread spectrum

Question

1) (15 points) Your receiver has synchronized with the received spread spectrum code. The figure below displays the received code and the estimated code. Time is increasing from left to right. With reference to the noncoherent delay-lock code tracking loop in Figure 4-9, page 165, a) Would the voltage v(t) be positive or negative? b) What happens to the frequency at the output of the VCO (decreases or increases)? c) After the updated frequency at the VCO, what happens to the pulse width of your estimated code (shortens or lengthens)? +1 v Received Code t -1v +1v Estimated Code

Explanation / Answer

1.Positive as the band pass and low pass filter never inverts inputs just filter some frequencies.Hence Vt is positive.

2.Frequecy decreased as the given input wave flow through band pass and low pass filter.

3.Lenghtens after updating frequency at VCO.

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