ADVANTAGES AND DISADVANTAGES OF DIGITAL COMMUNICATION SYSTEM

Why Digital Communication?

We know, that the electronic communication can either be analog or digital.  Today’s world is going digital, so it is really important to understand, the advantages of digital communication, that are responsible for the digitalization everywhere.

So here in this post, we will see, why digital communication is preferred over analog communication? But there are also some disadvantages associated with the digital communication. These disadvantages will also be discussed here. So first let's start with the advantages of digital communication.

Advantages and Disadvantages of Digital Communication Video [HD]

 

Advantages of Digital Communication

1. Digital communication systems are simpler and cheaper in implementation as compared to analog communication systems. It has become possible due to advancements in Integrated Circuits (IC) technology. These ICs are very small in size, reliable and cost-effective. Such ICs are used in digital communication,

2. In digital communication, it is possible to use multiplexing to merge speech, video and other forms of data for transmission over a common channel. The multiplexing is of various types like Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM) or Code Division Multiplexing (CDM).                     

I don’t want to deviate from the current topic, so I will discuss the multiplexing in separate post. 

       

3. High level of privacy can be obtained in digital communication using data encryption technique. This privacy provides the facility to allow the transmitted signals, to be received only by the permitted receivers. This feature is of great importance in military applications.

4. In digital communication channel encoding is used. Because of this encoding, there is less accumulation of noise from repeater to repeater, in case of long-distance communication. Apart from this, the digital signals tend to be less affected by noise as compared to analog signals.

5.  It is possible to perform lots of operations on digital signals, like Digital Signal Processing (DSP), data compression, image processing etc.

                      

6. It is easy to detect and correct errors in digital communication. This easy detection and correction of errors is possible due to the use of channel coding in digital communication.

So these were the advantages of using digital communication. These benefits encourage the use of digital communication in place of analog communication.

Now we will discuss some disadvantages that are associated with the digital communication.

Disadvantages of Digital Communication

                 

1. More transmission bandwidth is required in digital communication as compared to analog communication. This is due to the increase in the data rate when analog signal is converted into digital signal.

 

2. In digital communication, in case of synchronous modulation, synchronization is required.

                 

3. Due to various stages used in conversion, high power consumption is another drawback of digital communication.

4. Sampling error is introduced in the sampling of signal.                        

5. Circuits that are used in digital communication are comparatively more complex and sophisticated.

         

So this was the discussion about both advantages and disadvantages of digital communication but it’s worth mentioning that the advantages of using digital communication are more in comparison to disadvantages. Therefore digital communication is replacing analog communication nowadays.

Read More-

Go To HOME Page
   
FREQUENCY SPECTRUM OF AMPLITUDE MODULATION (WAVEFORMS AND EQUATIONS DERIVATION)

AMPLITUDE MODULATION (TIME DOMAIN EQUATIONS AND WAVEFORMS)

ADVANTAGES AND DISADVANTAGES OF DIGITAL COMMUNICATION SYSTEM

ADVANTAGES OF OPTICAL FIBER COMMUNICATION

STEP INDEX OPTICAL FIBER (MULTIMODE AND SINGLE MODE STEP INDEX FIBERS)

PULSE MODULATION TECHNIQUES (PAM, PWM, PPM, PCM)

OPTICAL FIBER: STRUCTURE AND WORKING PRINCIPLE

PULSE AMPLITUDE MODULATION (PAM)

COMPARISON OF PAM, PWM, PPM MODULATION TECHNIQUES

PULSE WIDTH MODULATION (PWM)

CONTINUOUS TIME AND DISCRETE TIME SIGNALS (C.T. AND D.T. SIGNALS)

NEED AND BENEFITS OF MODULATION

PULSE POSITION MODULATION (PPM)

OPTICAL FIBERS IN COMMUNICATION: COVERS ALL IMPORTANT POINTS

OPTICAL FIBER SOURCES (DESIRABLE PROPERTIES)

AMPLITUDE MODULATION Vs FREQUENCY MODULATION (ADVANTAGES AND DISADVANTAGES)

PULSE CODE MODULATION (PCM) [ADVANTAGES AND DISADVANTAGES]

SAMPLING THEOREM AND RECONSTRUCTION (SAMPLING AND QUANTIZATION)

SUPERPOSITION THEOREM (BASICS, SOLVED PROBLEMS, APPLICATIONS AND LIMITATIONS)

Digital Modulation Techniques (ASK, FSK, PSK, BPSK)/ Amplitude, Frequency and Phase Shift Keying

Conventional AM Vs DSB-SC Vs SSB-SC Vs VSB (Comparison of AM Systems)

Quadrature Amplitude Modulation (QAM)/ QAM Transmitter and QAM Receiver Block Diagram

Single-Mode Optical Fiber Advantages

What are Microwaves and their Applications (Uses) in various fields

Microwaves Properties and Advantages (Benefits)

Basic Structure of Bipolar Junction Transistor (BJT) - BJT Transistor - Working and Properties

Polar Plots of Transfer Functions in Control Systems (How to Draw Nyquist Plot Examples)

Generation of Binary Phase Shift Keying (BPSK Generation) - Block Diagram of Binary Phase Shift Keying (BPSK)

Low Level and High Level Modulation Block Diagram (AM Transmitter Block Diagram)

Block Diagram of CRO (Cathode Ray Oscilloscope), Components of CRO and CRT with Structure and Working

Slope Overload Distortion and Granular (Idle Noise), Quantization Noise in Delta Modulation

Frequency Translation/Frequency Mixing/Frequency Conversion/Heterodyning (Basic Concepts and Need)

Quadrature Phase Shift Keying Modulation (QPSK) Basics, Waveform and Benefits

Pulse Code Modulation (PCM) Vs Differential Pulse Code Modulation (DPCM)

Digital Modulation Techniques (Coherent and NonCoherent Digital Modulation Techniques)

AMPLITUDE MODULATION (TIME DOMAIN EQUATIONS AND WAVEFORMS)

What is Amplitude Modulation (AM)

Definition:-

Amplitude Modulation may be defined as a system, where the maximum amplitude of the carrier wave varies, according to the instantaneous value (amplitude) of the modulating (message or baseband) signal.

Note: [In case of Frequency modulation (FM), the frequency of the carrier wave varies, according to the instantaneous value of the modulating signal, while in Phase Modulation (PM), the phase of the carrier wave varies, according to the instantaneous value of the modulating signal.]

Amplitude Modulation (AM modulation) Video [HD]

 

What Will You Learn Here about Amplitude Modulation?

After reading this post, you will understand:-

#What is Amplitude Modulation (AM)

#Time Domain analysis of the Amplitude Modulation

#Equations of Amplitude Modulation (Time Domain)

#Waveforms of Modulating signal, Carrier signal and Amplitude Modulated wave and

#Properties of the amplitude modulation

Equations of Amplitude Modulation (Time Domain)

As per the definition of the amplitude modulation we can express it mathematically as-

FREQUENCY SPECTRUM OF AMPLITUDE MODULATION (WAVEFORMS AND EQUATIONS DERIVATION)

What is Amplitude Modulation (AM)

Definition:-

Amplitude Modulation, is a system, where the maximum amplitude of the carrier wave varies, according to the instantaneous value (amplitude) of the modulating (message or baseband) signal.

Note:- 

In case of Frequency Modulation (FM) or Phase Modulation (PM), the frequency or phase respectively, of the carrier wave varies, according to the instantaneous value of the modulating (message) signal.

FREQUENCY SPECTRUM OF AMPLITUDE MODULATION VIDEO [HD]

 

In the previous post, I discussed; what is amplitude modulation and its various properties. We talked about only the time domain analysis of the amplitude modulation. We saw here, how the waveform changes with time but here, we will discuss the frequency domain analysis of the amplitude modulation. Here you will see, how the spectrum of modulating signal, carrier signal and modulated wave looks like. I will also derive here the equation of AM wave in frequency domain. So let's start...