Modulation in Computer Network
Modulation is the process of transforming data into electrical or digital signals so that those signals can be transmitted over a medium. It makes the signals stronger so they can travel as far as possible. Demodulation is the process of obtaining information from the broadcast signal. A device that can do both modulation and demodulation is called a modem. The purpose of the different types of modulation is to change the properties of carrier waves.
Usually, electromagnetic signals are modulated by the modulation device. Computer networks, lasers and optics, and radio waves are typical examples.
Characteristics of a Computer Network
- A modulation scheme with a high spectral efficiency is more effective because it can fit more data into the same amount of bandwidth.
- An effective modulation method should function well in a variety of contexts, including rural, suburban, and urban ones, without experiencing appreciable performance loss.
- The system's practicality and cost are influenced by the intricacy of the modulation and demodulation processes. In general, schemes that are easier to execute are favored.
- The size of the antennas required for transmission and reception can be decreased through modulation. The effective transmission range of signals can be increased through modulation.
Types Of Modulation in Computer Network
- Amplitude Modulation
- Frequency Modulation
- Phase Modulation
1. Amplitude Modulation
The signal modulation technique known as amplitude modulation (AM) modifies a carrier wave's amplitude in accordance with the information stream. This method is frequently employed in electronic communication, especially when sending radio waves to convey messages.
Advantages of Amplitude modulation :
- When compared to other modulation techniques, AM is very easy to execute.
- The cost of manufacturing AM transmitters and receivers may be lower.
Disadvantages of Amplitude Modulation:
- Signals using amplitude modulation are more vulnerable to interference from other signals and noise.
- Since amplitude modulation uses a larger bandwidth to transmit energy, it may use less power than other modulation techniques.
2. Frequency Modulation
It is a form of modulation where the phase and amplitude of the signals remain constant but the carrier signal's frequency is modified to reflect the data's frequency. Because it is more noise-immune than amplitude modulation, this technology is commonly utilized in radio broadcasting and telecommunications.
Advantage of Frequency Modulation
- In contrast to Amplitude Modulation (AM), FM is less vulnerable to noise and interference.
- FM broadcasting is perfect for music because it offers a higher fidelity sound experience.
Disadvantage Of Frequence Modulation
- Compared to their AM equivalents, FM transmitters and receivers are typically more costly.
- To send the same data, FM needs a larger frequency bandwidth than AM.
3. Phase Modulation
Phase modulation (PM) has drawbacks, such as possible phase ambiguity and demodulation difficulty, but it also has benefits like simplicity of use and strong noise protection. Applications needing reliable carriers and fast communication frequently employ it.
Advantage of Frequency Modulation
- Phase modulation is easier to use than frequency modulation (FM).
- Phase Modulation can be similar to FM in some situations and generally has superior noise immunity compared to amplitude Modulation.
Disadvantage of Frequency Modulation
- Compared to AM, demodulating PM signals might be more difficult, requiring complex circuitry for precise phase monitoring and signal recovery.
- When sophisticated demodulation techniques are required, PM systems can be more expensive and complex to implement.
