Advantages of Digital Modulation Techniques
- High Immunity to noise: Since the modulated wave consist of finite collection of amplitude/frequency or phase shifts, changes occurred in above parameters due to noise, distortion and dispersion is less as compared to difference in amplitude/frequency or phase shift between two distinct symbols. For e.g. An Amplitude Shift Keyed wave will have higher noise tolerance since the interference cannot bring 0V i.e. logic 0 to 12V which is representing logic 1. Hence the demodulated wave at the receiver highly represents the input message signal applied at the transmitter.
- High Security: Since the message signal is digital in Digital Modulation, encryption techniques can be employed to improve authenticity, confidentiality and integrity of data. After encrypting the digital message we can proceed with modulation process for transmitting the message. Such features are not available in Analog Modulation as message signal is of analog type.
- Efficient Usage of Bandwidth: By using compression techniques we can reduce the number of bits of the message signal without affecting the data content in it. Hence if we compress the message signal and modulate it then it will take less bandwidth as compared to modulating the original message signal.
- High Accuracy of Data: With the help of error detection and error correction techniques we can find the presence of errors in the demodulated wave at the receiver side and correct it accordingly to get the original message signal.
- High Capacity: We can use Time Division Multiple Access (TDMA) instead of Frequency Division Multiple Access (FDMA) in case of Digital Modulation as frequency or spectrum is limited and it is not possible to assign certain frequency per user as number of users is quite high compared to available channels. Hence capacity can be increased by letting the users access the channel for certain time period one after the other.
Digital Modulation Techniques
Modulation is the Fundamental Process in Communication Systems, In Modulation Low-Frequency Message Signal Blends with High-Frequency Carrier Frequency to Enable Efficient Transfer of the Signal. In this article, we will be going through Digital Modulation Techniques, First we will start our Article by Defining Modulation, Then we will go through the Three types of Digital Modulation techniques with Their Wave, At Last we will conclude our Article With their Application, Advantages, Disadvantages and Some FAQs.
Table of Content
- Modulation
- Digital Modulation Techniques
- Amplitude Shift Keying
- Frequency Shift Keying
- Phase Shift Keying
- M-ary Encoding
- Applications
- Advantages
- Disadvantages