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Electronics Digital Communication Ebook Preview of the attached file Data transmission, digital transmission, or digital communications is the physical transfer of data (a digital bit stream) over a point-to-point or point-to-multipoint communication channel. Examples of such channels are copper wires, optical fibres, wireless communication channels, and storage media. The data is represented as an electromagnetic signal, such as an electrical voltage, radiowave, microwave, or infrared signal. While analog transmission is the transfer of continuously varying analog signal, digital communications is the transfer of discrete messages. The messages are either represented by a sequence of pulses by means of a line code (baseband transmission), or by a limited set of continuously varying wave forms (passband transmission), using a digital modulation method.
The passband modulation and corresponding demodulation (also known as detection) is carried out by modem equipment. According to the most common definition of digital signal, both baseband and passband signals representing bit-streams are considered as digital transmission, while an alternative definition only considers the baseband signal as digital, and passband transmission of digital data as a form of digital-to-analog conversion. Please download the attached file to view rest of the content. Electronics Digital Communication Hand Written Notes Preview of the attached file Digital transmission or data transmission traditionally belongs to telecommunications and electrical engineering. Basic principles of data transmission may also be covered within the computer science/computer engineering topic of data communications, which also includes computer networking or computer communication applications and networking protocols, for example routing, switching and process-to-process communication. Although the Transmission control protocol (TCP) involves the term 'transmission', TCP and other transport layer protocols are typically not discussed in a textbook or course about data transmission, but in computer networking. The term tele transmission involves the analog as well as digital communication.
In most textbooks, the term analog transmission only refers to the transmission of an analog message signal (without digitization) by means of an analog signal, either as a non-modulated baseband signal, or as a passband signal using an analog modulation method such as AM or FM. It may also include analog-over-analog pulse modulatated baseband signals such as pulse-width modulation. In a few books within the computer networking tradition, 'analog transmission' also refers to passband transmission of bit-streams using digital modulation methods such as FSK, PSK and ASK. Note that these methods are covered in textbooks named digital transmission or data transmission, for example. Please download the attached file to view rest of the content. Electronics Digital Communication Tutorial Preview of the attached file A telecommunication system works by exploiting the propagation of electromagnetic waves in a medium.
In the case of radio transmission, the medium is the electromagnetic spectrum; in the case of land-line communications such as those in voiceband or ADSL modems, themedium is a copper wire. In all cases, the properties of the medium determine two fundamental constraints around which any communication system is designed:. Bandwith constraint: data transmission systems work best in the frequency range over which themedium behaves linearly; over this passband we can rely on the fact that a signal will be received with only phase and amplitude distortions, and these are “good” types of distortion since they amount to a linear filter.
Further limitations on the available bandwidth can be imposed by law or by technical requirements and the transmitter must limit its spectral occupancy to theprescribed frequency region. Power constraint: the power of a transmitted signal is inherently limited by various factors, including the range over which the medium and the transmission circuitry behaves linearly. In many other cases, such as in telephone or radio communications, the maximum power is strictly regulated by law.
Also, power could be limited by the effort to maximize the operating time of battery-powered mobile devices. At the same time, all analog media are affected by noise, which can come in the form of interference from neighboring transmission bands (as in the case of radio channels) or of parasitic noise due to electrical interference (as in the case of AC hum over audio lines). The noise floor is the noise level which cannot be removed and must be reckoned with in the transmission scheme. Power constraints limit the achievable signal to noise ratio (SNR) with respect to the channel’s noise floor; in turn, the SNR determines the reliability of the data transmission scheme. Please download the attached file to view rest of the content.