Reasons for modulation

Reasons for modulation

1. Permits frequency multiplexing

   • Baseband signals occupying the same f ranges can be transmitted simultaneously
     • Achieved by making the modulated waveform to occupy different f ranges

2. Practicability of antennas

   • Many information signals are in low frequencies = large wavelength
     • Large wavelength require large antennas
       • impractical
   • thus, modulate to high frequency (radio f) signals
     • ease transmission

3. Narrowbanding

   • Difficult to design antenna for wideband signal
     • therefore, modulation narrowband the info signal