Answer:
The baud rate is the number of signal units transmitted per second, where each signal unit can represent multiple bits depending on the modulation scheme used.
a. For FSK, each signal unit represents one bit. Therefore, the baud rate is equal to the bit rate, which is 2000 bps.
b. For ASK, each signal unit also represents one bit. Therefore, the baud rate is equal to the bit rate, which is 4000 bps.
c. For QPSK, each signal unit represents two bits. Therefore, the baud rate is half of the bit rate, which is 3000 baud (6000 bps / 2).
d. For 64-QAM, each signal unit represents 6 bits (log2(64) = 6). Therefore, the baud rate is equal to the bit rate divided by 6, which is 6000 baud (36,000 bps / 6).
In summary:
a. Baud rate = 2000 baud
b. Baud rate = 4000 baud
c. Baud rate = 3000 baud
d. Baud rate = 6000 baud