It started in 1978 with the invention of spectrum-efficient digital FM by de Jager and Dekker. After their invention, many digital modulation methods were proposed in a very short period, described later in detail. The motivation for efficient digital modulation was digital voice communications.Digital modulation techniques are essential for transmitting digital data over analog channels, offering advantages such as noise resistance and efficient data transmission
Digital modulation techniques are methods used to encode digital data into analog signals for transmission over various communication channels.
Modulation is the process of superimposing high-frequency carrier signals with low-frequency message signals resulting in a modulated wave. In modulation, one of the three parameters of the carrier wave is changed i.e. amplitude, frequency or phase according to the amplitude of the message signal at a given time instant. It is an important technique used to increase the range of communication.
Modulation techniques are essential for efficient transmission of data over long distances, reducing interference, and enabling multiple signals to share the same communication channel.
Modulation is crucial for long-distance communication as it increases signal frequency, reducing attenuation and allowing the use of smaller, more practical antennas. Low-frequency signals like audio would otherwise require massive antennas and suffer significant signal loss over distance.
Bit Rate: The number of bits conveyed or processed per unit of time.
Symbol Rate: The number of symbol changes made to the transmission medium per second.
Bandwidth: The maximum rate of data transfer across a given path.
SNR: t's a measure of the strength of a desired signal relative to the amount of background noise.
BER: It is a measure of the reliability of digital data transmission, specifically the ratio of wrongly received bits to the total number of transmitted bits.