Question

5) given the following PM modulated signal equation, determine the original message equation, m(t) . s(t)= 3.5cos(2π2E9t + 0.5cos(2π6000t)), Kp=0.1 (hz/v)

a) m(t)=0.16cos(2π6000t)

b) m(t) = 5cos(2π6E3t)

c) m(t) = 5cos(2π2E9t)

d) m(t) = 0.16cos(2π2.4E9t)

6) given the following message and carrier waves. Determine the AM signal equation and (DSB-LC) bandwidth: m(t) =2sin(2π10KHz*t). c(t) =3sin(2π2.4E9Hz*t)

a) 5[1+0.6sin(200πt)]sin(2π10E9t), BW=10kHz

b) 3[1+0.67 sin(2π10E3t)]sin(2π2.4E9t), BW=20kHz

c) 3[1+0.6sin(2.4GHz*πt)]sin(2π10E3Hz*t), BW=20kHz

d) 3[1+1.67 sin(2π50t)]sin(2π10E9tt), BW=10kHz

7) amplitude used in a communication path will increase both signal and noise power, whereas digital repeaters will improve SNR

1. true

2. false

8) Select the correct statement(s) regarding the signal-to-noise ratio (SNR)

a. Thermal noise plays a predominant role in the noise floor power

b. An increase in signal power results in an increase in SNR

c. Increasing the noise floor results in a decrease in SNR

d. All statements are correct