Consider the block diagram of a typical digital transmission system. Speculate where one would use source coding and channel coding. Differentiate between them. Would they increase or decrease the original message size? (Hint: we want to transmit most efficiently, i.e., message size should be the smallest possible but enough redundancy should be added to correct small errors so that retransmission is avoided as far as possible).
Source coding is a technique used to ensure that the information to be
transmitted is coded using as few bits as possible. The basic purpose of source
coding is to better utilize the available bandwidth by transmitting more
information using fewer bits.
Channel coding is a technique used to overcome the deficiencies of the noisy
transmission medium. It basically adds redundancy to the transmitted bits so
that the receiver is able to detect and/or correct the errors in the received
information using the additional bits.
Source coding decreases the original message size by using compression
techniques whereas channel coding adds redundant information to overcome
transmission errors thus increasing the transmitted message size.
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