• Modulation is the process of putting information onto a high frequency carrier for transmission ( frequency translation). 1.What is modulation?
1. Frequency division multiplexing (To support multiple transmissions via a single channel) To avoid interference 2.What are the reasons for modulation?
f M ( f ) 0 f 1 f 2 Multiplexed signal +
2. Practicality of Antennas Transmitting very low frequencies require antennas with miles in wavelength