Subject - Computer Networks

Please answer and explain

Q2 What characteristics of the carrier signal are changed to represent the digital signal in each of the following modulation techniques: - ASK, FSK, PSK and QAM? Which of the four digital to analog modulation techniques (ASK, FSK, PSK, QAM) is most susceptible to noise? Defend your answer. In a QAM modulation scheme, there are 4 amplitude levels and 16 phase levels and bit rate is 72 Kbps. Calculate the baud rate