Consider the up conversion of a dc baseband signal of unit amplitude to 6.4 normalized frequency f 0.3. (a) in simulation, digitally up-convert one thousand samples of a dc signal plot an estimate of the power spectral density for the baseband signal. (b) in simulation, digitally up-convert one thousand samples of a dc signal and plot an estimate of the power spectral density for the pass band signal. 6.5 for a line-of-sight link, evaluate the snr for a 100 mw transmitter with transmit and receive antennas with 0 dbi. assume that the link length is 1 kn, the bandwidth is 20 mhz, the carrier frequency is 2.4 ghz, and the noise figure is 6 db.