(a) A communication link is 17 km long. The first 7 km cable has an attenuation of 5 dB|km. The rest of the cable has an attenuation of 10 dB|km. The receiver has a minimum signal power threshold (sensitivity) of -100 dBm. The transmit signal in volts is given by x(t) = 1+acos(2π ft). What is the smallest value of a?
September 28, 2021
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