Modulation techniques of analog signals

Modulation Types Tutorial Includes ITU radio emission designations Today vast amounts of information are communicated using radio communications systems.

Modulation techniques of analog signals

Modulation Types Tutorial Includes ITU radio emission designations Today vast amounts of information are communicated using radio communications systems.

Both analogue radio communications systems, and digital or data radio communications links are used. However one of the fundamental aspects of any radio communications transmission system is modulation, or the way in which the information is superimposed on the radio carrier.

Basic types of modulation

In order that a steady radio signal or "radio carrier" can carry information it must be changed or modulated in one way so that the information can be conveyed from one place to another.

There are very many ways in which a radio carrier can be modulated to carry a signal, each having its own advantages and disadvantages.

The choice of modulation have a great impact on the radio communications system. Some forms are better suited to one kind of traffic whereas other forms of modulation will be more applicable in other instances. Choosing the correct form of modulation is a key decision in any radio communications system design.

Basic types of modulation There are three main ways in which a radio communications or RF signal can be modulated: As the name implies, this form of modulation involves modulating the amplitude or intensity of the signal.

Amplitude modulation was the first form of modulation to be used to broadcast sound, and although other forms of modulation are being increasingly used, amplitude modulation is still in widespread use.

Read more about Amplitude Modulation. This form of modulation varies the frequency in line with the modulating signal. Frequency modulation has the advantage that, as amplitude variations do not carry any information on the signal, it can be limited within the receiver to remove signal strength variations and noise.

As a result is form of modulation has been used for many applications including high quality analogue sound broadcasting. Read more about Frequency Modulation.

As the name indicates, phase modulation varies the phase of the carrier in line with the modulating signal. Phase modulation and frequency modulation have many similarities and are linked - one is the differential of the other. However phase modulation lends itself to data transmissions, and as a result its use has grown rapidly over recent years.

Read more about Phase Modulation. Each type of modulation has its own advantages and disadvantages, and accordingly they are all used in different radio communications applications. In addition to the three main basic forms of modulation or modulation techniques, there are many variants of each type.

Again these modulation techniques are used in a variety of applications, some for analogue applications, and others for digital applications.

Modulation techniques of analog signals

Angle Modulation Angle modulation is a name given to forms of modulation that are based on altering the angle or phase of a sinusoidal carrier. Using angle modulation there is no change in the amplitude of the carrier. The two forms of modulation that fall into the angle modulation category are frequency modulation and phase modulation.

Both types of angle modulation, namely frequency modulation and phase modulation are linked because frequency is the derivative of phase, i. Another way of looking at the link between the two types of modulation is that a frequency modulated signal can be generated by first integrating the modulating waveform and then using the result as the input to a phase modulator.Digital modulation in somewhat similar to the analog modulation except base band signal is of discrete amplitude level.

For binary signal it has only two level, either high or logic 1 or low or logic 0. The modulation scheme is mainly three types.

Analog and Digital Pulse Modulation Techniques Also, analog signals are transmitted digitally. Reduced distortion and improvement in signal to noise ratios. PAM, PWM, PPM, PCM and DM. In CW modulation schemes some parameter of modulated wave varies.

ANALOG AND DIGITAL MODULATION TECHNIQUES Assignment 1 Yogesh Maheshwari INTRODUCTION: Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal (high frequency signal), with a modulating signal that typically contains information to be.

parameter of the carrier is continuous in accordance to the input. analog signal the modulation technique is termed as analog.

modulation scheme if the variation is discrete then it . In analog modulation, analog signal (sinusoidal signal) is used as a carrier signal that modulates the message signal or data signal. The general function Sinusoidal wave’s is shown in the figure below, in which, three parameters can be altered to get modulation – they are amplitude, frequency and phase; so, the types of analog modulation are.

ANALOG AND DIGITAL MODULATION TECHNIQUES Assignment 1 Yogesh Maheshwari INTRODUCTION: Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal (high frequency signal), with a modulating signal that typically contains information to be transmitted.

What is Modulation? Different Types of Modulation Techniques