Question

Problem #2: (40 points) Consider the following communication link. Both the transmitter and receivers are properly matched to their respective antennas. Assume that the system nominal temperature is 290 K. A detailed block diagram of the receiver is shown in the figure Determine 1. The effective isotropic radiated power in dBm. 2. The space loss in dB 3. The communication link total losses in dB 4. What would be the received power at the receiver input in dBm? 5. What's the noise power picked up by the antenna in dBm? 6. What's the signal-to-noise ratio at the receiver's input in dB? 7. The equivalent noise temperature and noise figure of the receiver 8. What's the pre-detection signal-to-noise ratio in dB (before the detector/decoder stage)? Note: Eb/No at this point is used to determine the BER, remember that No is noise power density (W/Hz) and the Eb is related to the pre-detection signal power (Ppre). If the modulation scheme used in the communication system is 8-PSK, what would be the bit error rate of the system at the maximum data rate? (at the output of the detector/decoder) 9. 10.Now, we change the modulating scheme to 16-PSK, what would be the bit error rate of the system at the maximum data rate? G 40 dB Tant 1500 K G-34 dB Pt 100w Cable loss 1 dB SNR R 30,000 km f#14 GHz BW 12 MHz Atmospheric losses 2 dB Figure 2: Communication Wnk block diagram.

Answer 1