5 OxFORD Third Edition roblern 1 (24%) ju astify Fexplain how you choose your an

Question

5 OxFORD Third Edition roblern 1 (24%) ju astify Fexplain how you choose your anower or (6) option for all the following subproblems. Please do not need to (1) Consider the sine signal g)Aine(W'r). The energy of g() is an FM wave, given by s(t)-A, cos(2xfet+3 salaf ty. If is sman compared to one radian, then s(t) can be approximated by (a) Let Xi and Xy are two iid. standard Gausian random variables and xxX Then we know (a) X, is a Gaussian random variable. (b) X is not a Gaussian random variable. (4) Let Xi and X2 are two iid. Poisson random variables with mean . Then we know (a) Var(X, X2|-A. (b) Elx,X21-A2. (5) Let X(0) be a Wide-Sense Stationary (WSS) signal that is the input of a causal LTI system. If Y) is the output of the LTI system, then we know that (a) Y(t) must be WSS. (b) Y() must not be WSS. (6) Consider the signal gtt) sin(100)+sine (200). The Nyquist rate for g(t) is (a) 400 Hz. (b) 200 Hz (7) Which of the following statement regrading the Pre-Detection SNR and Post-Detection SNR is usually true? (a) The Pre-Detection SNR is usually larger than the Post-Detection SNR. (b) The Pre-Detection SNR is usually smaller than the Post-Detection SNR (8) Which of the following is the disadvantage of using unipolar nonreturn-to-zero (NRZ) signaling? (a) It wastes transmit power due to transmitting DC signals. (b) Its transmitting rate is low.

Explanation / Answer

1.A

2.B

3.B

4.A

5.A

6.A

PROOF:

100t+200t=(100+200)t

NYQUSIT RATE:TWICE THE MAXIMUM FREQUENCY.

SO 200*2=400 HZ

7.B

8.A

proof:

unipolar NRZ, are issues related to the presence of a transmitted DC level.SO unipolar non return to zero is wastes transmit power due to transmitting dc signals.

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