modulation and types of modulation pdf

Modulation and types of modulation pdf

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The Many Types of Radio Frequency Modulation

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Modulation Method Definitions

Modulation is the act of changing a signal to transmit useful data. There are three aspects of a signal that can be modulated; amplitude, frequency, and phase. This article discusses the topic of modulation, and describes how it is relevant to wireless communication.

The Many Types of Radio Frequency Modulation

As we are living in an era of communication wherein we can easily transfer any form of information video, audio, and other data in the form of electrical signals to any other device or destined area. Although it is common in our perceptual experience that sending or receiving signals or data is simple, but it involves quite complex procedures, possibilities, and involved scenarios within the communication systems. So, in the scope of communication systems, modulation plays hold crucial responsibility in the communication system to encode information digitally in the analog world. It is very important to modulate the signals before sending them to the receiver section for larger distance transfer, accurate data transfer, and low-noise data reception. To be clear, let us dive into the detailed concept of knowing what is modulation, different types in it, and what are the types of modulation techniques used in communication systems. Modulation is a process of changing the characteristics of the wave to be transmitted by superimposing the message signal on the high-frequency signal.

Modulation is the process by which information is encoded from a message source in order to optimize it for transmission. Frequency Modulation FM is the encoding of information in a carrier wave by changing the instantaneous frequency of the wave. FM technology is widely used in the fields of computing, telecommunications, and signal processing. Frequency Modulation is a modulation in which the frequency of the carrier wave is altered in accordance with the instantaneous amplitude of the modulating signal, keeping phase and amplitude constant. Modification of carrier wave frequency is performed for the purpose of sending data or information over small distances. Frequency Modulation index is consistently over 1, requires high bandwidth in the range of kHz, operates in a very high frequency range of 88 to Megahertz, has a complex circuit with an infinite number of side bands, and receives a high quality signal with high sound quality.

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A signal can be anything like a sound wave which comes out when you shout. This shout can be heard only up to a certain distance. A message carrying signal has to get transmitted over a distance and for it to establish a reliable communication, it needs to take the help of a high frequency signal which should not affect the original characteristics of the message signal. The characteristics of the message signal, if changed, the message contained in it also alters. Hence it is a must to take care of the message signal. A high frequency signal can travel up to a longer distance, without getting affected by external disturbances. We take the help of such high frequency signal which is called as a carrier signal to transmit our message signal.

Modulation Method Definitions

For a signal to be transmitted to a distance, without the effect of any external interferences or noise addition and without getting faded away, it has to undergo a process called as Modulation. It improves the strength of the signal without disturbing the parameters of the original signal. A message carrying a signal has to get transmitted over a distance and for it to establish a reliable communication, it needs to take the help of a high frequency signal which should not affect the original characteristics of the message signal.

The term carrier is applied to the voltage whose characteristic is varied and the term modulating voltage signal is used for the voltage in accordance with which the variation is made. The modulation is the process of up shifting the message frequency to a range more useful for transmission. The carrier signal is a sine wave at the carrier frequency. Below equation shows that the sine wave has three characteristics that can be altered. So three forms of modulations are possible.

What is Modulation and Different Types

In electronics and telecommunications , modulation is the process of varying one or more properties of a periodic waveform , called the carrier signal , with a separate signal called the modulation signal that typically contains information to be transmitted. For example, the modulation signal might be an audio signal representing sound from a microphone , a video signal representing moving images from a video camera , or a digital signal representing a sequence of binary digits, a bitstream from a computer.

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