Baseband Transmission System

BASEBAND TRANSMISSION SYSTEM

In digital communication, formatting is the first and most important signal processing step. Formatting ensures that the message or source signal may be processed digitally. The method of transforming source data to digital symbols is known as transmit formatting. Source coding is the term used when data compression and formatting are used together. 

The binary ones and zeros logical structure is used to represent digital communications. Baseband processors convert these messages into baseband waveforms via pulse modulation. Waveforms of this nature can then be sent through a cable.

BASEBAND SYSTEMS

The Figure represents the functional diagram of baseband signal formatting and transmission (Baseband Systems).


                   Figure: Formatting and Transmission of baseband signals (Baseband Systems)

 Formatting transforms source data into bits, ensuring that the data and signal processing processes of a digital communication system are compatible. Up to the pulse modulation block, the information is in the form of a bit stream.

Analog and discrete information sources are available. As a result, a data source's output might be digital, textual, or analogue. The formatting function would not be used if the data was already in digital format. With the help of a coder, textual data is converted to binary digits. If the data is in the form of alphanumeric text, it will be encoded using one of many common formats, including ASCII, EBCDIC, Baudot, and Hollerith.

The three independent procedures of sampling, quantization, and coding are used to format analogue data. The formatting phase produces a series of binary numbers for all sorts of information sources.

The bit stream is converted into a series of pulse waveforms by the pulse modulator. The digits being transmitted correspond to the features of this series of pulses. These pulse waveforms are then sent across a baseband channel, which might be a pair of wires or a coaxial cable.

The pulse waveforms are recovered (demodulated) and detected after transmission over the channel to generate an approximation of the transmitted digits. The reverse formatting is the final stage, which retrieves an estimate of the source data.

Sreejith Hrishikesan

Sreejith Hrishikesan is a ME post graduate and has been worked as an Assistant Professor in Electronics Department in KMP College of Engineering, Ernakulam. For Assignments and Projects, Whatsapp on 8289838099.

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