Differentiate between frequency modulation and phase modulation
Answers
What is the difference between phase modulation and frequency modulation?
Frequency Modulation(FM) is the modulation technique in which carrier frequency varies based on analog baseband information signal to be transmitted using wireless device.
• Advantages: Increased immunity to noise.
• Disadvantage: Requires larger bandwidth.
• Application: Radio Broadcasting, Direct Satellite Broadcasting
Phase Modulation(PM) is the modulation technique in which carrier phase varies based on analog baseband information signal to be transmitted using wireless device. If a constant amplitude as well as constant frequency sine wave carrier is given to the phase shifter the output is phase modulated signal. Phase modulation is referred as indirect frequency modulation due to the fact that phase modulation produces frequency modulation. The effect of variation in amount of phase shift is proportional to change in the carrier frequency.
Advantages: Increased immunity to noise.
• Disadvantages: More complex hardware at receiver.
• Applications: Used in data communication systems.